Browse content similar to Lift Off!. Check below for episodes and series from the same categories and more!
Line | From | To | |
---|---|---|---|
I'm a doctor, and I work in some pretty extreme environments. | 0:00:03 | 0:00:06 | |
But I also work with Nasa trying to keep astronauts healthy | 0:00:06 | 0:00:10 | |
in the most extreme environment of all. | 0:00:10 | 0:00:12 | |
If we want to explore the cosmos | 0:00:12 | 0:00:14 | |
then we're going to have to learn how to survive in space. | 0:00:14 | 0:00:18 | |
APPLAUSE | 0:00:45 | 0:00:46 | |
Thank you. Sorry I'm late. | 0:01:03 | 0:01:05 | |
I had to hitch a ride with some friends to beat the traffic. | 0:01:05 | 0:01:08 | |
Welcome to the 2015 Christmas Lectures. | 0:01:08 | 0:01:12 | |
This year's theme is how to keep astronauts like Tim Peake alive | 0:01:12 | 0:01:17 | |
in space. So let's start at the very beginning. | 0:01:17 | 0:01:20 | |
If you're going to survive being in space, | 0:01:20 | 0:01:25 | |
you've first got to survive getting to space, | 0:01:25 | 0:01:28 | |
which means surviving something that feels a bit like this. | 0:01:28 | 0:01:31 | |
BOOM, AUDIENCE GASPS | 0:01:31 | 0:01:33 | |
LAUGHTER | 0:01:36 | 0:01:38 | |
APPLAUSE | 0:01:38 | 0:01:41 | |
Now, that was just... | 0:01:48 | 0:01:49 | |
That was just a balloon filled with some hydrogen and oxygen, | 0:01:49 | 0:01:53 | |
and that's just a tiny fraction of the energy it takes | 0:01:53 | 0:01:56 | |
to hurl people and objects into space. | 0:01:56 | 0:01:58 | |
And that's the truth of this endeavour. | 0:01:58 | 0:02:00 | |
It's at the limits of all our capability. | 0:02:00 | 0:02:03 | |
It takes the edge of everything we have | 0:02:03 | 0:02:05 | |
in science, technology and engineering | 0:02:05 | 0:02:08 | |
to make that happen. | 0:02:08 | 0:02:09 | |
Now, when I was a doctor and I used to work with Nasa | 0:02:09 | 0:02:12 | |
I thought there would be plenty for me to do on my own. | 0:02:12 | 0:02:15 | |
But in fact, you need an army of thousands if not tens of thousands | 0:02:15 | 0:02:19 | |
of people to protect these crews as they go about their business. | 0:02:19 | 0:02:24 | |
And perhaps the most amazing thing of all | 0:02:24 | 0:02:26 | |
is that there are people who are prepared to ride fireballs like that. | 0:02:26 | 0:02:30 | |
One in particular, and his name is Tim Peake. | 0:02:30 | 0:02:35 | |
The first British astronaut for 25 years. | 0:02:35 | 0:02:38 | |
It's been a quarter of a century since our first British astronaut, | 0:02:38 | 0:02:42 | |
Helen Sharman, went into space, | 0:02:42 | 0:02:44 | |
and now we have Tim aboard the space station | 0:02:44 | 0:02:47 | |
and he's been super-busy, but he's taken the time | 0:02:47 | 0:02:50 | |
to send us here at the Royal Institution | 0:02:50 | 0:02:53 | |
a very special message, and we'll have a look at that now. | 0:02:53 | 0:02:57 | |
Hi, Kevin, and hello to everybody in the audience | 0:02:57 | 0:02:59 | |
at the Royal Institution Christmas Lectures. | 0:02:59 | 0:03:02 | |
I'm Tim Peake, and by the time you see this message, | 0:03:02 | 0:03:04 | |
I'll be 400km above the Earth's surface | 0:03:04 | 0:03:07 | |
on the International Space Station. | 0:03:07 | 0:03:09 | |
We've learnt an awful lot about human space flight since 1961, | 0:03:09 | 0:03:13 | |
but we still have a huge amount yet to learn. | 0:03:13 | 0:03:15 | |
That's why I'm really excited and delighted that the topic | 0:03:15 | 0:03:18 | |
of this year's Royal Institution Christmas Lectures | 0:03:18 | 0:03:21 | |
is all about living and working in space. | 0:03:21 | 0:03:24 | |
So, um, I'd just better get changed, really, | 0:03:24 | 0:03:26 | |
into something a bit more appropriate. | 0:03:26 | 0:03:29 | |
Right up here, this is our Mission Control, | 0:03:29 | 0:03:31 | |
we're getting live information from the space station. | 0:03:31 | 0:03:34 | |
You can see some very beautiful pictures there. | 0:03:34 | 0:03:36 | |
Who saw Tim Peake's launch? | 0:03:36 | 0:03:38 | |
I watched it. I try to go to a launch whenever I can. | 0:03:38 | 0:03:41 | |
Unfortunately, I couldn't get to Tim's launch | 0:03:41 | 0:03:43 | |
because I was here preparing for these lectures, | 0:03:43 | 0:03:46 | |
so I had to send someone in my stead, | 0:03:46 | 0:03:47 | |
and that was possibly the only person on the planet | 0:03:47 | 0:03:51 | |
who's more excited than me about launching things into space, | 0:03:51 | 0:03:54 | |
and that is planetary scientist Professor Monica Grady. | 0:03:54 | 0:03:59 | |
Hi, Kevin, hi, people back at the Royal Institution lecture theatre! | 0:03:59 | 0:04:03 | |
It's coming, and here it is, you can see it! | 0:04:03 | 0:04:06 | |
Here it is! It's huge! | 0:04:06 | 0:04:08 | |
It's the rocket, the Soyuz rocket that Tim Peake's going to get into. | 0:04:08 | 0:04:11 | |
We're here in Baikonur, a really, really historic place. | 0:04:11 | 0:04:15 | |
It's the place where Yuri Gagarin set off from, | 0:04:15 | 0:04:18 | |
the first man in space. | 0:04:18 | 0:04:20 | |
The boosters are just going past now. | 0:04:20 | 0:04:22 | |
We've got the bit where all the fuel tanks are, | 0:04:22 | 0:04:25 | |
and then the little pod capsule where the astronauts will be. | 0:04:25 | 0:04:29 | |
It travels a lot faster than I thought it was going to. | 0:04:29 | 0:04:32 | |
Sorry, I know Alex is filming me, | 0:04:32 | 0:04:33 | |
but I'm going to take a picture as well because I want to record this. | 0:04:33 | 0:04:37 | |
Kevin, I'm really, really sorry you can't be here. | 0:04:37 | 0:04:41 | |
Honest. | 0:04:41 | 0:04:42 | |
Thank you for giving me the opportunity to come and share | 0:04:42 | 0:04:45 | |
this amazing, exciting atmosphere with you, | 0:04:45 | 0:04:49 | |
because it's a historic moment. | 0:04:49 | 0:04:51 | |
So I guess I'll sign off, and see you then! Bye! | 0:04:51 | 0:04:56 | |
APPLAUSE | 0:04:56 | 0:04:58 | |
So, er, she's very excitable, that Professor Grady, isn't she? | 0:05:02 | 0:05:06 | |
But she's got a right to be excited. It is exciting. | 0:05:06 | 0:05:09 | |
But it's also very, very lethal. | 0:05:09 | 0:05:13 | |
And to help explain why, | 0:05:13 | 0:05:14 | |
I'm going to need at least two volunteers here. | 0:05:14 | 0:05:18 | |
OK. Let's go up here, let's have you, | 0:05:18 | 0:05:23 | |
and...how about you, here? | 0:05:23 | 0:05:26 | |
OK, come down and stand here. | 0:05:26 | 0:05:29 | |
APPLAUSE | 0:05:29 | 0:05:31 | |
OK, now stand here and face the crowd. | 0:05:31 | 0:05:35 | |
Now, what's your name? | 0:05:35 | 0:05:38 | |
-You're...? -Fred. -Fred. -Yes. | 0:05:38 | 0:05:40 | |
-Fred and...? -Adam. | 0:05:40 | 0:05:42 | |
Fred and Adam. Brilliant. Fred and Adam, | 0:05:42 | 0:05:44 | |
I'm going to turn you into rocket launchers. | 0:05:44 | 0:05:47 | |
And I know you don't immediately believe me, but I really am. | 0:05:47 | 0:05:49 | |
We're going to stand behind our rockets, | 0:05:49 | 0:05:51 | |
which look suspiciously like sandbags. | 0:05:51 | 0:05:53 | |
Fred, if you stand behind this one, Adam, if you stand here. OK. | 0:05:53 | 0:05:56 | |
So first of all, prepare your rocket launcher. | 0:05:56 | 0:05:59 | |
Your right hand like this. | 0:05:59 | 0:06:01 | |
Good. OK. Now, what I want you to do, when I say go, | 0:06:01 | 0:06:04 | |
is to chuck this bag as far across there as you can. | 0:06:04 | 0:06:08 | |
Try not to hit the front row over there or the cameraman, all right? | 0:06:08 | 0:06:11 | |
Ready, Adam? We're going to count you in. Everyone... | 0:06:11 | 0:06:14 | |
Three, two, one - go! | 0:06:14 | 0:06:17 | |
OK. | 0:06:17 | 0:06:19 | |
It's a pretty heavy bag, isn't it? | 0:06:19 | 0:06:21 | |
Fred, let's see if you can get it a bit further. | 0:06:21 | 0:06:23 | |
Yours is a bit lighter, actually. Three, two, one, go! | 0:06:23 | 0:06:26 | |
Very impressive. | 0:06:28 | 0:06:30 | |
APPLAUSE | 0:06:30 | 0:06:32 | |
Look, I told you I'd turn you into rocket launchers, | 0:06:39 | 0:06:42 | |
and you may have expected those to go into orbit. | 0:06:42 | 0:06:44 | |
They were trying to go into orbit. | 0:06:44 | 0:06:46 | |
Everything you throw, as it turns out, wants to go into an orbit. | 0:06:46 | 0:06:49 | |
It's just that the Earth gets in the way. | 0:06:49 | 0:06:52 | |
Now, when you threw your bag, Adam, | 0:06:52 | 0:06:54 | |
it came and it landed here. | 0:06:54 | 0:06:56 | |
Fred, when you threw yours a little bit harder, | 0:06:56 | 0:06:59 | |
shallower arc, further, and landed here. | 0:06:59 | 0:07:01 | |
So it would have gone in orbit around the centre of mass of the Earth | 0:07:01 | 0:07:04 | |
but the Earth just got in the way. | 0:07:04 | 0:07:06 | |
And this is something that someone realised a long time ago. | 0:07:06 | 0:07:10 | |
Fred, Adam, thank you so much, why don't you go back to your seats? | 0:07:10 | 0:07:14 | |
APPLAUSE | 0:07:14 | 0:07:16 | |
So what scientists realised more than 300 years ago, | 0:07:16 | 0:07:20 | |
and one scientist in particular, | 0:07:20 | 0:07:22 | |
was that if you could throw something hard enough | 0:07:22 | 0:07:25 | |
it would travel in a long enough and shallow enough arc | 0:07:25 | 0:07:28 | |
that it would fall and never again hit the planet. | 0:07:28 | 0:07:31 | |
And it would fall forever around the Earth, and that's what an orbit is. | 0:07:31 | 0:07:37 | |
If you take something, instead of your arm, you take a cannon, | 0:07:37 | 0:07:40 | |
as we have in this diagram here, | 0:07:40 | 0:07:41 | |
you can imagine that might have been Adam's throw, | 0:07:41 | 0:07:44 | |
that might have been Fred's throw, | 0:07:44 | 0:07:46 | |
and that is a proper rocket launcher | 0:07:46 | 0:07:48 | |
getting you all the way around the Earth and into orbit. | 0:07:48 | 0:07:51 | |
Er, and it's incredible, I think, to me, | 0:07:51 | 0:07:54 | |
that more than three centuries ago | 0:07:54 | 0:07:56 | |
a scientist could have had the kernel of thought | 0:07:56 | 0:07:59 | |
that would get people and objects into space | 0:07:59 | 0:08:02 | |
so many, many centuries later. | 0:08:02 | 0:08:04 | |
That scientist, of course, was Sir Isaac Newton, | 0:08:04 | 0:08:08 | |
and we know what he thought cos he wrote that stuff down in a book - | 0:08:08 | 0:08:12 | |
possibly the most important, or at least one of the most important, | 0:08:12 | 0:08:15 | |
books in the history of science. | 0:08:15 | 0:08:18 | |
And that book was called Principia. | 0:08:18 | 0:08:23 | |
Principia, with no coincidence, is the name of Tim's mission. | 0:08:23 | 0:08:27 | |
This is the patch he wears on him at all times during this mission, | 0:08:27 | 0:08:31 | |
and it's named after that very important book. | 0:08:31 | 0:08:33 | |
And we here are the Royal Institution are extraordinarily lucky, | 0:08:33 | 0:08:36 | |
because we have one of the very early editions of that book, | 0:08:36 | 0:08:40 | |
and to help me show it to you, | 0:08:40 | 0:08:42 | |
I'd like to introduce our curator, Charlotte. | 0:08:42 | 0:08:45 | |
APPLAUSE | 0:08:45 | 0:08:49 | |
Now, Charlotte this is how old, this book? | 0:08:56 | 0:08:59 | |
-Er, 1713. -It comes back to 1713, and this is Principia, | 0:08:59 | 0:09:02 | |
-it's a second edition...? -Second edition. -..of that textbook. | 0:09:02 | 0:09:06 | |
So this is Newton laying down his thoughts about | 0:09:06 | 0:09:08 | |
how people and objects in the world behave | 0:09:08 | 0:09:12 | |
and the laws of motion, and if you just come in here, | 0:09:12 | 0:09:14 | |
Phil, and take a look at this, this is a page from that book. | 0:09:14 | 0:09:18 | |
I have to wash my hands before I touch it otherwise I'll damage it. | 0:09:18 | 0:09:21 | |
-May I take it? -Yes. -It is very beautiful, | 0:09:21 | 0:09:23 | |
and we're very privileged to have it. And if you can see there, | 0:09:23 | 0:09:27 | |
it is written in a language other than English. | 0:09:27 | 0:09:29 | |
This is Latin, as all academic texts of the time were written. | 0:09:29 | 0:09:33 | |
And I don't speak any Latin, | 0:09:33 | 0:09:37 | |
but I am reliably informed that this page | 0:09:37 | 0:09:40 | |
is the three laws of motion. | 0:09:40 | 0:09:42 | |
And if you take your eyes down here to Lex III, | 0:09:42 | 0:09:46 | |
or Lex Tres, | 0:09:46 | 0:09:47 | |
that is Newton's Third Law of Motion. | 0:09:47 | 0:09:50 | |
And I know, because you all pay attention at school, | 0:09:50 | 0:09:53 | |
that you know that Newton's Third Law of Motion is... | 0:09:53 | 0:09:56 | |
For every action there is an equal... | 0:09:56 | 0:09:59 | |
ALL: ..and opposite reaction. | 0:09:59 | 0:10:02 | |
Wahey! | 0:10:02 | 0:10:03 | |
HISSING | 0:10:03 | 0:10:05 | |
OK. | 0:10:09 | 0:10:11 | |
So, uh... I've always, always wanted to do that. | 0:10:11 | 0:10:13 | |
That's possibly the only circumstance | 0:10:13 | 0:10:16 | |
in which it's acceptable to use fire extinguishers in that way. | 0:10:16 | 0:10:20 | |
Don't do that. Really, don't. | 0:10:20 | 0:10:22 | |
Um, so! Newton told us over 300 years ago | 0:10:22 | 0:10:27 | |
that what we need to do if we want to go into space | 0:10:27 | 0:10:30 | |
is one, throw something really, really hard, | 0:10:30 | 0:10:32 | |
and two, throw something that way so you can propel your vehicle | 0:10:32 | 0:10:36 | |
and your crew in that direction. | 0:10:36 | 0:10:38 | |
And the question here is, what is it that you throw? | 0:10:38 | 0:10:41 | |
And the answer is fuel out of a rocket. | 0:10:41 | 0:10:45 | |
Er, and rocket fuel is extraordinarily dangerous, | 0:10:45 | 0:10:51 | |
but we've managed to get some. | 0:10:51 | 0:10:52 | |
This is rocket fuel, this is real rocket fuel, | 0:10:52 | 0:10:55 | |
and it's pretty explosive. Have a quick smell of that. | 0:10:55 | 0:10:58 | |
Rocket fuel. | 0:10:58 | 0:10:59 | |
Rocket fuel. Have a smell. | 0:11:01 | 0:11:03 | |
OK, so very, very dangerous, rocket fuel. | 0:11:03 | 0:11:06 | |
So this stuff, long chains of carbon atoms and hydrogen joined together, | 0:11:06 | 0:11:11 | |
and the energy between those bonds | 0:11:11 | 0:11:13 | |
you let go - oh, yes - before you make it become the stuff | 0:11:13 | 0:11:18 | |
that sends people and objects into space. | 0:11:18 | 0:11:21 | |
Rocket fuel is the sort of stuff that, you know, | 0:11:21 | 0:11:25 | |
if you're around when it goes wrong, | 0:11:25 | 0:11:28 | |
you tend to not be around for much longer. | 0:11:28 | 0:11:30 | |
So...you all right? | 0:11:30 | 0:11:32 | |
Ready? Here we go. | 0:11:32 | 0:11:34 | |
Ooh. Better stamp that one out. | 0:11:35 | 0:11:36 | |
OK, OK, OK. We'll go again, | 0:11:36 | 0:11:38 | |
LAUGHTER we'll go again, we'll go again. | 0:11:38 | 0:11:40 | |
OK, OK, OK, here we go. | 0:11:40 | 0:11:41 | |
All right, so of course, I was happy to do that, | 0:11:43 | 0:11:47 | |
because of course, this stuff is engineered to be safe | 0:11:47 | 0:11:51 | |
under these circumstances. | 0:11:51 | 0:11:53 | |
That's what you want out of your rocket fuel. | 0:11:53 | 0:11:55 | |
That's a very vital part of Tim's survival in space. | 0:11:55 | 0:11:58 | |
This is what you want rocket fuel to do - you want it to be safe | 0:11:58 | 0:12:01 | |
on the pad under these conditions, before you light it, | 0:12:01 | 0:12:04 | |
and let it be everything it can be | 0:12:04 | 0:12:06 | |
before you let it liberate all of its energy. | 0:12:06 | 0:12:09 | |
And it is engineered very specifically to do that. | 0:12:09 | 0:12:12 | |
They take kerosene, they refine it very carefully, | 0:12:12 | 0:12:15 | |
they take out some of the lighter fractions, | 0:12:15 | 0:12:17 | |
so some of the shorter chain molecules, | 0:12:17 | 0:12:19 | |
so it's not so volatile, | 0:12:19 | 0:12:20 | |
which means that I can't get it going like that. | 0:12:20 | 0:12:23 | |
Now, the question is, what can I do | 0:12:23 | 0:12:27 | |
to make that be everything it can be | 0:12:27 | 0:12:30 | |
and release its chemical potential. | 0:12:30 | 0:12:32 | |
And I am not going to try and light rocket fuel here. | 0:12:32 | 0:12:34 | |
Don't ever do this, by the way, with any... | 0:12:34 | 0:12:37 | |
Any fuel that you might find around you, by the way, in the house. | 0:12:37 | 0:12:41 | |
Petrol, chip fat - it will ruin your entire day. | 0:12:41 | 0:12:46 | |
We're going to do this demonstration | 0:12:46 | 0:12:48 | |
with a fuel that's slightly more gentle | 0:12:48 | 0:12:49 | |
and that you're more familiar with, | 0:12:49 | 0:12:52 | |
and that is the great British biscuit. | 0:12:52 | 0:12:54 | |
Now, you use this as fuel, | 0:12:54 | 0:12:56 | |
and you use it to power yourselves. | 0:12:56 | 0:12:59 | |
I'm going to use it to show you that if you get the right conditions, | 0:12:59 | 0:13:03 | |
you can get quite boring things to release a fair amount of energy. | 0:13:03 | 0:13:08 | |
Why couldn't I get that rocket fuel going? | 0:13:08 | 0:13:10 | |
It's because I was probably missing the vital elements | 0:13:10 | 0:13:14 | |
of the fire triangle. Now, you know you need some fuel, | 0:13:14 | 0:13:17 | |
I've got some fuel. And I did have some oxygen in the air around me, | 0:13:17 | 0:13:21 | |
but I didn't have enough heat. | 0:13:21 | 0:13:24 | |
So you need fuel, you need heat, and you need oxygen, | 0:13:24 | 0:13:28 | |
and then you can get the stuff going. | 0:13:28 | 0:13:31 | |
So I've got my fuel, a bit of oxygen, | 0:13:31 | 0:13:33 | |
er, I've got my heat here, I'll get these going. | 0:13:33 | 0:13:38 | |
Ooh. I should put some goggles on, shouldn't I, really? | 0:13:38 | 0:13:41 | |
You never know. OK, here we go. | 0:13:41 | 0:13:44 | |
So heat, oxygen, fuel... | 0:13:44 | 0:13:47 | |
Very disappointing. | 0:13:48 | 0:13:49 | |
And you're probably sitting there thinking, "I knew that, | 0:13:49 | 0:13:52 | |
"I knew the biscuits weren't going to do anything exciting, | 0:13:52 | 0:13:55 | |
"because biscuits aren't very exciting." | 0:13:55 | 0:13:57 | |
But that's the thing. | 0:13:57 | 0:13:59 | |
I had fuel, and I had heat, | 0:13:59 | 0:14:02 | |
and I had some oxygen - there's 21% oxygen in the air that we breathe. | 0:14:02 | 0:14:06 | |
But that's not enough oxygen. To get this to be everything it can be | 0:14:06 | 0:14:09 | |
I need enough oxygen to soak these biscuits. | 0:14:09 | 0:14:12 | |
I need to literally soak these biscuits in oxygen | 0:14:12 | 0:14:16 | |
and I can only do that if I have some liquid oxygen. | 0:14:16 | 0:14:20 | |
Now...here's the problem with that. | 0:14:20 | 0:14:24 | |
It's quite hard to make liquid oxygen. | 0:14:24 | 0:14:26 | |
We've got a set-up here that's going to do that, | 0:14:26 | 0:14:28 | |
and Andy's going to help me with it. | 0:14:28 | 0:14:30 | |
This is oxygen in a cylinder. | 0:14:30 | 0:14:32 | |
It's what I use every day in my hospital. | 0:14:32 | 0:14:35 | |
It's compressed to about 200 times the pressure | 0:14:35 | 0:14:38 | |
you have here in this room now, | 0:14:38 | 0:14:39 | |
so there's a good couple of thousand litres of oxygen in that. | 0:14:39 | 0:14:43 | |
That oxygen is running through this tube right now, as a gas. | 0:14:43 | 0:14:47 | |
The next thing is it runs into this copper pipe, | 0:14:47 | 0:14:50 | |
which is very good at conducting things. | 0:14:50 | 0:14:52 | |
And to get something to become a liquid when it's as a gas, | 0:14:52 | 0:14:56 | |
you have to get it below its boiling point. | 0:14:56 | 0:14:59 | |
And this is the problem. | 0:14:59 | 0:15:01 | |
The boiling point of oxygen is -183 degrees Celsius. | 0:15:01 | 0:15:06 | |
To get it to turn into a liquid from a gas, | 0:15:06 | 0:15:08 | |
I have to get it colder than -183 degrees Celsius, | 0:15:08 | 0:15:11 | |
and for that I need to use what is probably Andy's | 0:15:11 | 0:15:14 | |
and the Royal Institution's favourite substance ever - liquid nitrogen. | 0:15:14 | 0:15:18 | |
Liquid nitrogen is at -196 degrees Celsius, | 0:15:18 | 0:15:21 | |
er, and so as the oxygen passes through that copper tube as a gas, | 0:15:21 | 0:15:25 | |
the liquid nitrogen draws the energy out of the gas, | 0:15:25 | 0:15:29 | |
it turns it into a liquid, | 0:15:29 | 0:15:30 | |
and I can collect liquid oxygen in this test tube. | 0:15:30 | 0:15:33 | |
And that's what's happening now. | 0:15:33 | 0:15:35 | |
This is a very beautiful moment for me, | 0:15:35 | 0:15:38 | |
because I use oxygen in hospitals every day, | 0:15:38 | 0:15:40 | |
but I never really see it, cos it's invisible. | 0:15:40 | 0:15:43 | |
I've been told in textbooks that it has this beautiful blue tinge, | 0:15:43 | 0:15:47 | |
and we are going to try and see that now. | 0:15:47 | 0:15:49 | |
And it's boiling away. It's boiling away | 0:15:49 | 0:15:51 | |
because it's 200 degrees above its boiling point here, | 0:15:51 | 0:15:54 | |
and this is what happens if you have some heat, | 0:15:54 | 0:15:58 | |
have some fuel, | 0:15:58 | 0:15:59 | |
and have some liquid... | 0:15:59 | 0:16:02 | |
..oxygen. | 0:16:04 | 0:16:05 | |
Ooh. | 0:16:05 | 0:16:07 | |
And that is how you get rocket fuel to be rocket fuel. | 0:16:17 | 0:16:22 | |
Now, that looked like it wanted to go somewhere, | 0:16:22 | 0:16:24 | |
and that's a rocket full of biscuits. | 0:16:24 | 0:16:26 | |
And I can tell you something - Tim's rocket wasn't full of biscuits. | 0:16:26 | 0:16:30 | |
Tim's rocket was full of RP-1 rocket fuel, | 0:16:30 | 0:16:34 | |
liquid oxygen, and enough power to light it. | 0:16:34 | 0:16:38 | |
And that's the problem. | 0:16:38 | 0:16:39 | |
Someone has to control that, someone has to make sure | 0:16:39 | 0:16:42 | |
that those substances combine precisely at the right time | 0:16:42 | 0:16:46 | |
in precisely the right amounts | 0:16:46 | 0:16:47 | |
in precisely the right way | 0:16:47 | 0:16:49 | |
to propel you and your crew into space | 0:16:49 | 0:16:51 | |
instead of tearing your vehicle and your crew apart. | 0:16:51 | 0:16:55 | |
Now, let's go back to the hours before Tim's launch | 0:16:55 | 0:16:59 | |
and see how Monica's getting on. | 0:16:59 | 0:17:01 | |
Hi, Kevin, hi, kids! | 0:17:06 | 0:17:08 | |
It's an hour to launch and I'm here at the viewing area | 0:17:08 | 0:17:12 | |
about 2km away from the rocket, | 0:17:12 | 0:17:15 | |
which you can see on the horizon. | 0:17:15 | 0:17:17 | |
But here, we're waiting. Place is going to be crawling with engineers | 0:17:17 | 0:17:22 | |
and technicians making those last, vital checks | 0:17:22 | 0:17:25 | |
before they light the blue touchpaper | 0:17:25 | 0:17:28 | |
and send up this rocket | 0:17:28 | 0:17:29 | |
with its highly corrosive and very, very explosive fuel. | 0:17:29 | 0:17:32 | |
And it will be a big blast. Now, can you see? | 0:17:32 | 0:17:35 | |
There's a little white pointy thing on the top of the rocket. | 0:17:35 | 0:17:39 | |
Just underneath that is the capsule | 0:17:39 | 0:17:42 | |
where Tim and Tim and Yuri will be sitting. | 0:17:42 | 0:17:45 | |
So it's about an hour to go. | 0:17:45 | 0:17:48 | |
We're nearly there. Really exciting - I just can't wait! | 0:17:48 | 0:17:53 | |
APPLAUSE | 0:17:53 | 0:17:56 | |
So let's relive that hour before launch. | 0:18:08 | 0:18:11 | |
Let's take ourselves to our mission clock and let's get it going. | 0:18:11 | 0:18:15 | |
60 minutes before launch, and everyone who has no business | 0:18:15 | 0:18:18 | |
being on that tower is getting out of there. | 0:18:18 | 0:18:20 | |
The rocket is live and the rocket is dangerous. | 0:18:20 | 0:18:22 | |
When I say, "Anyone who doesn't have any business being there," | 0:18:22 | 0:18:25 | |
I mean anyone who's not riding that rocket into space. | 0:18:25 | 0:18:27 | |
Let's go forwards now to 30 minutes before. | 0:18:27 | 0:18:31 | |
At 30 minutes, they start to arm the launch escape rocket- | 0:18:31 | 0:18:34 | |
you can see, that white pointy thing that Monica talked about on the top. | 0:18:34 | 0:18:37 | |
If this goes wrong, if the rocket does explode, | 0:18:37 | 0:18:40 | |
the only way to outrun the ensuing fireball is with another rocket. | 0:18:40 | 0:18:44 | |
That solid rocket will light, carry the capsule up to 10,000 feet, | 0:18:44 | 0:18:48 | |
pop a parachute and dump them somewhere in Kazakhstan. | 0:18:48 | 0:18:50 | |
It doesn't matter where - anywhere away from that fireball. | 0:18:50 | 0:18:53 | |
We're forwards again now, we're going to ten minutes, | 0:18:53 | 0:18:56 | |
and at ten minutes they arm the flight recorders. | 0:18:56 | 0:18:59 | |
They record the information - if there's an accident, | 0:18:59 | 0:19:01 | |
there may be no-one around to tell them what happened. | 0:19:01 | 0:19:04 | |
They need to find that information. And now we're at five. | 0:19:04 | 0:19:07 | |
Five minutes, the astronauts are closing their visors, | 0:19:07 | 0:19:09 | |
they're shutting themself away from the atmosphere of this planet, | 0:19:09 | 0:19:13 | |
preparing themself for the place they're going to, | 0:19:13 | 0:19:16 | |
which will not support human life even for a few seconds. | 0:19:16 | 0:19:20 | |
And now we're forwards to just a minute and a half before launch, | 0:19:20 | 0:19:25 | |
and what is Tim thinking? Well, here's a video | 0:19:25 | 0:19:29 | |
to tell you what he thought he was going to feel like on that pad. | 0:19:29 | 0:19:33 | |
In the final seconds just before countdown, | 0:19:35 | 0:19:38 | |
I think rather than thinking about anything, | 0:19:38 | 0:19:41 | |
I'll actually just be experiencing it, | 0:19:41 | 0:19:43 | |
because by that stage, the rockets are already firing, | 0:19:43 | 0:19:46 | |
it's being held to the ground, | 0:19:46 | 0:19:48 | |
and you're just waiting for that liftoff, | 0:19:48 | 0:19:50 | |
but you're experiencing sounds, vibration, | 0:19:50 | 0:19:53 | |
and really the excitement of the launch that's about to come. | 0:19:53 | 0:19:56 | |
APPLAUSE | 0:19:58 | 0:20:00 | |
So that's not false bravado from Tim. | 0:20:00 | 0:20:03 | |
He has no option but to experience this launch, | 0:20:03 | 0:20:07 | |
because it's kind of out of his hands. | 0:20:07 | 0:20:08 | |
This thing is bigger than him, | 0:20:08 | 0:20:10 | |
it's bigger than his crew, it's bigger than the rocket. | 0:20:10 | 0:20:12 | |
This is the army of tens of thousands of people | 0:20:12 | 0:20:14 | |
who designed, built and operated this rocket, | 0:20:14 | 0:20:17 | |
and it has to work to keep him safe. | 0:20:17 | 0:20:20 | |
-Let's go and see Monica. -Really excited! | 0:20:20 | 0:20:22 | |
We can't hear a countdown yet. | 0:20:22 | 0:20:24 | |
I've got my phone out, I'm taking a picture too. | 0:20:24 | 0:20:28 | |
-OVER RADIO: -Ignition. | 0:20:28 | 0:20:29 | |
Do you see the gantry's gone down? | 0:20:31 | 0:20:33 | |
And the noise is starting. | 0:20:33 | 0:20:36 | |
ROARING | 0:20:36 | 0:20:38 | |
LECTURE AUDIENCE: Seven! Six! | 0:20:40 | 0:20:42 | |
Five! Four! Three! Two! One! | 0:20:42 | 0:20:47 | |
Oh, wow! Wow! Wow! Wow! | 0:20:50 | 0:20:54 | |
WOW! | 0:20:54 | 0:20:55 | |
Wow! Wow. | 0:20:55 | 0:20:57 | |
Bye-bye, Tim! Bye-bye, Tim! | 0:21:01 | 0:21:05 | |
Wow. | 0:21:13 | 0:21:15 | |
Can only barely hear the thunder now. | 0:21:22 | 0:21:25 | |
Yes, oh, right, the boosters coming off now. | 0:21:25 | 0:21:29 | |
You can see the smoke in the sky from the boosters. | 0:21:29 | 0:21:31 | |
You can see the trail in the sky. | 0:21:33 | 0:21:35 | |
The Soyuz rocket went straight up, vertically up, | 0:21:35 | 0:21:39 | |
and then just about where that puff of steamy, smoky stuff is, | 0:21:39 | 0:21:42 | |
it changed direction, it moved off over to the east. | 0:21:42 | 0:21:46 | |
Now it just looks like an ordinary aeroplane trail on the sky. | 0:21:46 | 0:21:51 | |
It was just amazing! | 0:21:51 | 0:21:53 | |
Just to see it going. | 0:21:53 | 0:21:54 | |
And it's like, I'm so happy it's gone off safely! It's fantastic! | 0:21:54 | 0:21:59 | |
APPLAUSE | 0:21:59 | 0:22:01 | |
Let's stop the mission clock. | 0:22:09 | 0:22:12 | |
That rocket is starting to tilt over and head east. Why? | 0:22:12 | 0:22:16 | |
Why is it going east? | 0:22:16 | 0:22:18 | |
Well, to help explain, I'm going to need a volunteer. | 0:22:18 | 0:22:21 | |
How about you? Yeah, OK, let's have you. Brilliant. | 0:22:21 | 0:22:24 | |
Brilliant. | 0:22:24 | 0:22:25 | |
APPLAUSE | 0:22:25 | 0:22:28 | |
Come and stand here. | 0:22:30 | 0:22:32 | |
-And what's your name? -Mia. -Mia. | 0:22:32 | 0:22:34 | |
Mia, OK. Mia, I'm going to turn you | 0:22:34 | 0:22:36 | |
into our launch controller at Baikonur. | 0:22:36 | 0:22:37 | |
Come and stand in your station. | 0:22:37 | 0:22:39 | |
This is our very expensive launch station here. | 0:22:39 | 0:22:41 | |
Er, and here at the RI we have our own International Space Station. | 0:22:41 | 0:22:46 | |
It took less than 15 years and 150 billion to build. | 0:22:46 | 0:22:51 | |
If you would take yourself into orbit, Cosmonaut John. | 0:22:51 | 0:22:55 | |
And so, Mia, we're going to launch ourselves into that dish. | 0:22:55 | 0:22:59 | |
Now, these rockets have all the energy they need | 0:22:59 | 0:23:02 | |
to get into that space station, OK? | 0:23:02 | 0:23:04 | |
All we've got to do is launch, OK? | 0:23:04 | 0:23:06 | |
When I count you in, you're going to hit this lever across that way, OK? | 0:23:06 | 0:23:10 | |
Give it a good whack. Ready? | 0:23:10 | 0:23:12 | |
Three! Two! One! | 0:23:12 | 0:23:15 | |
Go! | 0:23:15 | 0:23:16 | |
Oh, dear. Now... that's nothing, | 0:23:18 | 0:23:21 | |
you didn't do anything wrong there. Your launch was perfect. | 0:23:21 | 0:23:24 | |
And there's nothing wrong with the rockets either. | 0:23:24 | 0:23:26 | |
They have enough energy to get to the space station - | 0:23:26 | 0:23:31 | |
but only if they borrow a little bit of extra energy from somewhere else. | 0:23:31 | 0:23:35 | |
And that energy is borrowed from the rotation of the planet. | 0:23:35 | 0:23:40 | |
Now, this is our lovely map of the Earth | 0:23:40 | 0:23:43 | |
on top of this launch station. | 0:23:43 | 0:23:45 | |
At the poles, when the Earth is turning, | 0:23:45 | 0:23:48 | |
the Earth isn't turning very quickly. | 0:23:48 | 0:23:50 | |
As you get down towards the equator, | 0:23:50 | 0:23:53 | |
the speed of rotation is going pretty fast. | 0:23:53 | 0:23:55 | |
It's going about 1,000 miles an hour. | 0:23:55 | 0:23:57 | |
And if you launch towards the east, | 0:23:57 | 0:24:00 | |
as the Earth rotates from west to east you can get some of that energy. | 0:24:00 | 0:24:04 | |
So if you launch from the pole | 0:24:04 | 0:24:05 | |
you can't borrow much energy cos the Earth's not spinning very much. | 0:24:05 | 0:24:08 | |
If you're silly enough to try and launch | 0:24:08 | 0:24:10 | |
against the direction of rotation of the Earth, | 0:24:10 | 0:24:12 | |
then you're going to be in even worse shape. | 0:24:12 | 0:24:15 | |
The best place to launch from is where this red rocket is. | 0:24:15 | 0:24:18 | |
Launching with the rotation of the Earth, towards the east. | 0:24:18 | 0:24:21 | |
What we were missing before was the spin of the Earth. | 0:24:21 | 0:24:24 | |
So this time I'm going to spin the Earth and I'll help you launch it. | 0:24:24 | 0:24:27 | |
There's going to be no countdown | 0:24:27 | 0:24:29 | |
because they don't really do countdowns in Russia. OK, ready? | 0:24:29 | 0:24:32 | |
Here we go. | 0:24:32 | 0:24:33 | |
Yeah! All right! | 0:24:36 | 0:24:37 | |
Well done. Thank you, Mia. | 0:24:37 | 0:24:40 | |
APPLAUSE | 0:24:40 | 0:24:41 | |
And it's incredible to watch that go | 0:24:45 | 0:24:48 | |
as it launches out there towards the east. | 0:24:48 | 0:24:50 | |
Impossible to imagine - | 0:24:50 | 0:24:52 | |
but we don't need to imagine. We can ask someone who's actually done it. | 0:24:52 | 0:24:56 | |
It's my great pleasure to introduce a veteran astronaut | 0:24:56 | 0:24:59 | |
who's flown in space twice, | 0:24:59 | 0:25:01 | |
he's spent more than 211 days in space in total, | 0:25:01 | 0:25:05 | |
he's been aboard the International Space Station. | 0:25:05 | 0:25:07 | |
He's a doctor, but he's also a Nasa astronaut - | 0:25:07 | 0:25:10 | |
it's my great pleasure to introduce my friend and colleague | 0:25:10 | 0:25:13 | |
Dr Mike Barratt. | 0:25:13 | 0:25:15 | |
APPLAUSE | 0:25:15 | 0:25:17 | |
Hang on, Kevin. I actually need to fire up this iThingy, | 0:25:27 | 0:25:31 | |
because we've actually just had a tweet from the space station, | 0:25:31 | 0:25:36 | |
from astronaut Tim Peake, | 0:25:36 | 0:25:38 | |
who wanted to wish Dr Fong | 0:25:38 | 0:25:40 | |
good luck with the Christmas Lectures, | 0:25:40 | 0:25:42 | |
-and he's really excited to be part of it from space. -Wow. | 0:25:42 | 0:25:44 | |
So, a tweet from space. | 0:25:44 | 0:25:46 | |
That is my first ever tweet | 0:25:46 | 0:25:48 | |
from the space station, I think. Wow. Thank you, Tim! | 0:25:48 | 0:25:51 | |
-APPLAUSE -Surprise! | 0:25:51 | 0:25:55 | |
I don't know if I'm more shocked to get a tweet from Tim | 0:26:01 | 0:26:04 | |
or to know that astronauts get onto Twitter from space stations. | 0:26:04 | 0:26:07 | |
But never mind! You've done that for real, you've launched like that. | 0:26:07 | 0:26:10 | |
Just tell me what it's like | 0:26:10 | 0:26:11 | |
as it tips over and starts heading out east. | 0:26:11 | 0:26:13 | |
Well, launching on a rocket is a great experience I hope all of you | 0:26:13 | 0:26:16 | |
get to experience one day. It's very possible. | 0:26:16 | 0:26:19 | |
The Soyuz is very different from the Space Shuttle. | 0:26:19 | 0:26:21 | |
The Soyuz uses these very well-behaved liquid boosters, | 0:26:21 | 0:26:24 | |
and after the engines light, you sit there, you vibrate, | 0:26:24 | 0:26:27 | |
you shake, you hear the roar of the engines below you, | 0:26:27 | 0:26:30 | |
but actually when you lift off it's very gentle. | 0:26:30 | 0:26:32 | |
In fact, I wasn't even aware that we had lifted off | 0:26:32 | 0:26:35 | |
until I looked at my clock start to count up from zero | 0:26:35 | 0:26:38 | |
to tell me that we have left the Earth. | 0:26:38 | 0:26:40 | |
Is that true, that you had to watch the mission clock | 0:26:40 | 0:26:42 | |
to know that liftoff had happened? | 0:26:42 | 0:26:44 | |
For those first few seconds, that's absolutely right. | 0:26:44 | 0:26:47 | |
But then you start to build G-forces. | 0:26:47 | 0:26:49 | |
Because when you think about it, | 0:26:49 | 0:26:51 | |
you have to go from 0 to 17,500 miles an hour | 0:26:51 | 0:26:54 | |
in about nine minutes or so. | 0:26:54 | 0:26:55 | |
So you have to start accelerating, and after a while | 0:26:55 | 0:26:58 | |
you're going to get more than 3 Gs, | 0:26:58 | 0:27:01 | |
which means the forces through your chest | 0:27:01 | 0:27:03 | |
make you weigh three times your body weight. | 0:27:03 | 0:27:05 | |
-That's all the acceleration pushing through as you launch. -Absolutely. | 0:27:05 | 0:27:08 | |
-And so you end up weighing three times as much. -That's right. | 0:27:08 | 0:27:11 | |
Fortunately we're strapped into our seats | 0:27:11 | 0:27:14 | |
so we don't have to feel that too much, but if you lift your arm, | 0:27:14 | 0:27:17 | |
it weighs three times more than you thought, | 0:27:17 | 0:27:19 | |
and it feels pretty weird. But for me it was very special | 0:27:19 | 0:27:22 | |
because about two-and-a-half minutes into flight, | 0:27:22 | 0:27:25 | |
the outer shroud over the spacecraft blows away, | 0:27:25 | 0:27:28 | |
and sunlight streams into the capsule. And I couldn't lift myself, | 0:27:28 | 0:27:31 | |
but I lifted my arm, and I had a little wrist mirror, | 0:27:31 | 0:27:33 | |
and we were already 100km high | 0:27:33 | 0:27:35 | |
and I saw the clouds way below me, getting smaller, | 0:27:35 | 0:27:38 | |
so that's when you really know you've left the planet. | 0:27:38 | 0:27:40 | |
That sounds absolutely incredible. | 0:27:40 | 0:27:42 | |
If it's all right, we'll keep you here, we'll see you later, | 0:27:42 | 0:27:45 | |
but for now, astronaut Mike Barratt. | 0:27:45 | 0:27:47 | |
APPLAUSE | 0:27:47 | 0:27:49 | |
So as we relive this mission, | 0:27:56 | 0:27:58 | |
the crew are still racing away from the Earth | 0:27:58 | 0:28:01 | |
and they're leaving behind everything they take for granted | 0:28:01 | 0:28:03 | |
in the way of natural life support here on this planet. | 0:28:03 | 0:28:06 | |
And that is a perilously thin layer. | 0:28:06 | 0:28:09 | |
And over here, we are going to look at a good illustration | 0:28:09 | 0:28:13 | |
of just how thin that layer is. | 0:28:13 | 0:28:15 | |
Now, Alouette is an artist - hi, Alouette - | 0:28:15 | 0:28:18 | |
from the Royal College of Art. | 0:28:18 | 0:28:20 | |
To give you an impression of just how thin the layer of atmosphere is | 0:28:20 | 0:28:24 | |
that supports all life on Earth, have a look at this. | 0:28:24 | 0:28:27 | |
This is a football that's 22cm across? | 0:28:27 | 0:28:30 | |
Yeah, well, I don't know, it's a normal football size. | 0:28:30 | 0:28:33 | |
So I think that's regulation size, and I asked you to paint | 0:28:33 | 0:28:36 | |
a layer of paint on top of this beautiful map of the world | 0:28:36 | 0:28:39 | |
you're finishing off here, to show the atmosphere as it would be. | 0:28:39 | 0:28:42 | |
So how thick is your paint there? | 0:28:42 | 0:28:44 | |
Well, probably less than a millimetre. It's very thin. | 0:28:44 | 0:28:47 | |
So if the Earth were a football | 0:28:47 | 0:28:48 | |
and if you painted it and you painted on that atmosphere, | 0:28:48 | 0:28:51 | |
the atmosphere in which we live, on which we depend, | 0:28:51 | 0:28:54 | |
would be less than a millimetre thick. | 0:28:54 | 0:28:57 | |
It's not a biosphere. We think of it as a biosphere, | 0:28:57 | 0:29:00 | |
but it is in fact a biofilm. | 0:29:00 | 0:29:03 | |
It's smeared across the surface of the planet | 0:29:03 | 0:29:05 | |
the way that Alouette has smeared this paint | 0:29:05 | 0:29:07 | |
across the surface of this football. | 0:29:07 | 0:29:10 | |
That is what you depend upon. | 0:29:10 | 0:29:11 | |
Alouette, thank you so much, it's very beautiful. | 0:29:11 | 0:29:14 | |
-I can't wait to see it finished. Thank you. -Thanks. | 0:29:14 | 0:29:16 | |
APPLAUSE | 0:29:16 | 0:29:18 | |
And when you're on your way into space, | 0:29:21 | 0:29:23 | |
life gets hard very, very quickly. | 0:29:23 | 0:29:25 | |
It gets hard even before you've left that really thin layer. | 0:29:25 | 0:29:29 | |
I know, because I know someone who's been right up to the edge of it. | 0:29:29 | 0:29:32 | |
Er, I am going to introduce you to the man who has survived | 0:29:32 | 0:29:36 | |
with the lowest level of oxygen in his bloodstream | 0:29:36 | 0:29:40 | |
of any human being in the world. | 0:29:40 | 0:29:43 | |
I'd like to introduce you to my good colleague and friend, | 0:29:43 | 0:29:46 | |
intensive care doctor, Everest summiteer, | 0:29:46 | 0:29:49 | |
Dr Dan Martin. | 0:29:49 | 0:29:51 | |
APPLAUSE | 0:29:51 | 0:29:53 | |
How are you? | 0:29:55 | 0:29:57 | |
Now, Dan is a doctor, | 0:30:04 | 0:30:05 | |
but in 2007, he climbed to the summit of Everest | 0:30:05 | 0:30:07 | |
and did some crazy experiments. | 0:30:07 | 0:30:09 | |
You are dressed as you were when you did that. | 0:30:09 | 0:30:11 | |
This is the suit I wore to the summit of Everest in 2007. | 0:30:11 | 0:30:15 | |
A down suit to keep us warm up there on the summit. | 0:30:15 | 0:30:18 | |
And this is your oxygen as well. | 0:30:18 | 0:30:20 | |
Yeah, an oxygen bottle you'd put in your backpack | 0:30:20 | 0:30:23 | |
and an oxygen mask to breathe there, | 0:30:23 | 0:30:25 | |
cos the air is just so thin at the summit. | 0:30:25 | 0:30:27 | |
And you did a crazy experiment up there. | 0:30:27 | 0:30:29 | |
What did you do? | 0:30:29 | 0:30:31 | |
Well, we wanted to know how much oxygen there was in our blood | 0:30:31 | 0:30:33 | |
when we were close to the summit of Everest. | 0:30:33 | 0:30:36 | |
So we took blood samples from each other near to the summit, | 0:30:36 | 0:30:39 | |
sent them to an analyser | 0:30:39 | 0:30:40 | |
and worked out just how little oxygen there was in our blood. | 0:30:40 | 0:30:43 | |
And in hospital we measure the amount | 0:30:43 | 0:30:45 | |
of oxygen in your bloodstream to see how well you are. | 0:30:45 | 0:30:48 | |
Now, for people in this lecture theatre now, | 0:30:48 | 0:30:51 | |
if we measured the pressure of oxygen in their arteries, | 0:30:51 | 0:30:53 | |
so that's how we measure the amount of oxygen in your arteries, | 0:30:53 | 0:30:56 | |
what would we find? | 0:30:56 | 0:30:57 | |
The average pressure of oxygen in people's arteries here | 0:30:57 | 0:31:01 | |
-would be about 10-12? -Somewhere between ten and 12, yeah. | 0:31:01 | 0:31:04 | |
So for normal, healthy people let's say it's ten kilopascals of pressure. | 0:31:04 | 0:31:08 | |
At the point at which someone's sick enough on the ward | 0:31:08 | 0:31:10 | |
to start calling Dan or me down from Intensive Care | 0:31:10 | 0:31:13 | |
to scoop them up and stick them on a life-support machine | 0:31:13 | 0:31:15 | |
and rescue them by giving them more oxygen | 0:31:15 | 0:31:17 | |
and putting them on a ventilator, you're at how much? | 0:31:17 | 0:31:20 | |
Six is where I'd really get worried. | 0:31:20 | 0:31:22 | |
About six we're super-worried | 0:31:22 | 0:31:23 | |
and you're calling the Intensive Care doctor. | 0:31:23 | 0:31:25 | |
What was the level of oxygen in your bloodstream | 0:31:25 | 0:31:28 | |
-at the summit of Everest? -2.5. | 0:31:28 | 0:31:29 | |
LAUGHTER | 0:31:29 | 0:31:31 | |
-And that's a crazy low value. -Really low. | 0:31:31 | 0:31:35 | |
-And it is bizarre that you're still alive, frankly. -Thank you! | 0:31:35 | 0:31:41 | |
It's the lowest recorded oxygen level in any human being? | 0:31:43 | 0:31:47 | |
I believe so. We've never seen any lower, so that record remains. | 0:31:47 | 0:31:51 | |
It's pretty uncomfortable up there | 0:31:51 | 0:31:54 | |
and this is a huge amount of time you have to spend adapting to it. | 0:31:54 | 0:31:56 | |
Well, I can see you're getting quite warm in your down suit. | 0:31:56 | 0:31:59 | |
-Good for Everest, not good for the Royal Institution. -No! | 0:31:59 | 0:32:01 | |
-Thank you very much, Dr Dan Martin. -Thank you. | 0:32:01 | 0:32:03 | |
APPLAUSE | 0:32:03 | 0:32:05 | |
That's a crazy story from Dan | 0:32:12 | 0:32:13 | |
and it's amazing that he is alive at all. | 0:32:13 | 0:32:16 | |
To show you just how bad it is as you go out through the atmosphere, | 0:32:16 | 0:32:20 | |
let's go back to our mission clock. They're moving now. | 0:32:20 | 0:32:24 | |
They've gone beyond the summit of Everest at around 9km. | 0:32:24 | 0:32:27 | |
They've got up to 18km - 18,000 metres, 63,000 feet - | 0:32:27 | 0:32:31 | |
and that's an important boundary. | 0:32:31 | 0:32:33 | |
And to show you why, I'm going to need a couple of volunteers. | 0:32:33 | 0:32:37 | |
Let's have two volunteers. | 0:32:37 | 0:32:38 | |
I'm going to have to try and go up here for this one. | 0:32:38 | 0:32:40 | |
OK, stand up for me. | 0:32:40 | 0:32:43 | |
Go on. Yeah, why don't we have you? | 0:32:43 | 0:32:46 | |
Why don't you go down there and I'll go up here this time? | 0:32:46 | 0:32:49 | |
Just stand there. | 0:32:49 | 0:32:50 | |
And why don't you stand up for me? | 0:32:50 | 0:32:53 | |
Yeah, OK, why don't you come down as well? | 0:32:53 | 0:32:56 | |
-OK. And what's your name? -Toby. -Toby and... -Alexandra. | 0:33:03 | 0:33:07 | |
Alexandra, I've got something else in mind for you. | 0:33:07 | 0:33:09 | |
I think we're going to have to take you away right now. | 0:33:09 | 0:33:12 | |
We'll see you later I think. Bye-bye. | 0:33:12 | 0:33:15 | |
Don't worry, she'll be all right. | 0:33:15 | 0:33:17 | |
Now, how are you feeling? | 0:33:20 | 0:33:22 | |
-Good. -Good. Good, you sure? -Yeah. | 0:33:22 | 0:33:24 | |
OK. I think you should have a seat. | 0:33:24 | 0:33:26 | |
Let's put this in your mouth, shall we? | 0:33:26 | 0:33:29 | |
OK, so, open your mouth, stick this under your tongue, | 0:33:29 | 0:33:32 | |
keep it there. All right. | 0:33:32 | 0:33:34 | |
We'll come back to him later, don't worry! | 0:33:34 | 0:33:36 | |
All right, OK, so one of the things Dan Martin told me | 0:33:38 | 0:33:43 | |
about climbing Everest also... It's not very pleasant. | 0:33:43 | 0:33:46 | |
It's pretty cold, and you can't make a decent cup of tea. | 0:33:46 | 0:33:48 | |
You can't make a decent cup of tea on Everest | 0:33:48 | 0:33:50 | |
because as you rise up through the atmosphere, | 0:33:50 | 0:33:53 | |
the boiling point of water also falls, | 0:33:53 | 0:33:55 | |
because the pressure falls. | 0:33:55 | 0:33:57 | |
At the summit of Everest, the pressure has fallen so much | 0:33:57 | 0:34:00 | |
that the boiling point of water is only 72 degrees Celsius. | 0:34:00 | 0:34:03 | |
Now, as you keep going into the atmosphere, | 0:34:03 | 0:34:07 | |
that keeps happening until you reach a point, 63,000 feet, | 0:34:07 | 0:34:11 | |
18,000 metres, | 0:34:11 | 0:34:12 | |
where the astronauts are now in their mission, | 0:34:12 | 0:34:14 | |
where you can boil water at 37 degrees Celsius. | 0:34:14 | 0:34:19 | |
And Toby, you all right? | 0:34:19 | 0:34:22 | |
And your temperature is 36.8 degrees Celsius. | 0:34:23 | 0:34:27 | |
Yeah, so close enough to 37. | 0:34:27 | 0:34:29 | |
So you can reach a point in the atmosphere... | 0:34:29 | 0:34:33 | |
BEEPING ..where Toby can boil himself. | 0:34:33 | 0:34:36 | |
That sounds pretty unpleasant, doesn't it? | 0:34:37 | 0:34:39 | |
So you're going to come and help now. We're not going to boil you, Toby. | 0:34:39 | 0:34:43 | |
If you get to a point where your own core body temperature | 0:34:43 | 0:34:45 | |
can boil you, that's bad news. | 0:34:45 | 0:34:48 | |
Now, we won't boil you but we'll make a Toby model, OK? | 0:34:48 | 0:34:51 | |
So here's my Toby model. | 0:34:51 | 0:34:52 | |
It's not a very good model, I have to say. | 0:34:52 | 0:34:54 | |
So this is my Toby head, all right? It looks a bit like you! | 0:34:54 | 0:34:58 | |
And we'll have a marshmallow for your head | 0:34:58 | 0:35:01 | |
because that simulates your soft tissues. | 0:35:01 | 0:35:03 | |
This balloon will be like the air in your body, | 0:35:03 | 0:35:05 | |
perhaps the air in your lungs. So that's about where your lungs is. | 0:35:05 | 0:35:08 | |
OK, here's the important bit, here's the free water in your body. | 0:35:08 | 0:35:11 | |
Now, put your finger in that water, and it's pretty cold, isn't it? | 0:35:11 | 0:35:16 | |
It's about the same temperature as your body, actually, it's 37 degrees. | 0:35:16 | 0:35:19 | |
So that would be like the spit in your mouth | 0:35:19 | 0:35:21 | |
or the glass of water in your stomach just after you've drunk it. | 0:35:21 | 0:35:26 | |
There is water elsewhere, and let's just look at this last thing. | 0:35:26 | 0:35:29 | |
This is a red glass | 0:35:29 | 0:35:31 | |
that's like the water that's in your bloodstream, OK? | 0:35:31 | 0:35:34 | |
And that water has got a cover on it | 0:35:34 | 0:35:37 | |
because the blood, at least in your arteries, has a cover on it. | 0:35:37 | 0:35:41 | |
It has a muscular wall that protects it | 0:35:41 | 0:35:43 | |
and kind of acts like a pressure cooker. | 0:35:43 | 0:35:45 | |
And that'll stop the water from boiling a bit at least. | 0:35:45 | 0:35:48 | |
Now, let's line this all up for our Toby body | 0:35:48 | 0:35:51 | |
and let's get this going. | 0:35:51 | 0:35:53 | |
Now, we can't send all of this into space | 0:35:53 | 0:35:55 | |
but we can make it think it's gone into space. | 0:35:55 | 0:35:57 | |
We do that by putting it inside this vacuum chamber | 0:35:57 | 0:36:00 | |
and sucking out all the air. | 0:36:00 | 0:36:01 | |
So this is a vacuum pump, Toby. | 0:36:01 | 0:36:03 | |
And so if you put your hand on that switch, | 0:36:03 | 0:36:05 | |
and I'll get everyone to give you a countdown, | 0:36:05 | 0:36:07 | |
we're going to send this into space | 0:36:07 | 0:36:08 | |
by making it, well, think it's gone into space... | 0:36:08 | 0:36:11 | |
Three, two, one... | 0:36:11 | 0:36:13 | |
Off we go! Come round here, Toby, have a look at this. | 0:36:13 | 0:36:16 | |
So that needle is going up. | 0:36:16 | 0:36:18 | |
So right now we're about to get to the highest human habitations | 0:36:18 | 0:36:21 | |
at 5,000 metres. | 0:36:21 | 0:36:23 | |
We're at Dan Martin's altitude - 8,848 metres - | 0:36:23 | 0:36:25 | |
the summit of Everest, there. | 0:36:25 | 0:36:27 | |
Have a look what's happened to your head. Oh, my goodness! | 0:36:27 | 0:36:30 | |
And your lungs, they're getting bigger. | 0:36:30 | 0:36:32 | |
And now we're up into well above where a plane would be. | 0:36:32 | 0:36:36 | |
Oh, that was your lungs, that's very bad! | 0:36:36 | 0:36:38 | |
Look at your head, it's swelling. | 0:36:38 | 0:36:40 | |
There's vapour forming in the pockets inside your head | 0:36:40 | 0:36:43 | |
and some air expanding there. | 0:36:43 | 0:36:45 | |
Your head doesn't look very good at the moment, does it? | 0:36:45 | 0:36:49 | |
Now, that process I told you about is about to happen to that water. | 0:36:49 | 0:36:52 | |
Just watch very carefully. | 0:36:52 | 0:36:54 | |
The pressure's dropping. | 0:36:58 | 0:36:59 | |
A few bubbles. Here it goes, here it goes! | 0:37:00 | 0:37:02 | |
That is water boiling as you go off into space. | 0:37:04 | 0:37:08 | |
You look really unwell in there. Shall we save you? | 0:37:08 | 0:37:10 | |
Shall we turn off that pump? OK, off we go! | 0:37:10 | 0:37:14 | |
I think we should try and put some pressure back into the system. | 0:37:14 | 0:37:17 | |
Poor Toby! | 0:37:17 | 0:37:18 | |
All right... AIR WHOOSHES | 0:37:18 | 0:37:20 | |
LAUGHTER | 0:37:22 | 0:37:24 | |
You almost looked better before, didn't you? Oh, dear. | 0:37:25 | 0:37:29 | |
OK, so hopefully I can get some of you out. | 0:37:29 | 0:37:33 | |
There's not much left, I am afraid. | 0:37:33 | 0:37:35 | |
This is what happens if you go into space without a spacesuit. | 0:37:35 | 0:37:38 | |
Now, you saw that boiling, didn't you, as if it was in a kettle? | 0:37:38 | 0:37:40 | |
You put your finger in that. It's still cold. | 0:37:40 | 0:37:43 | |
So that's because boiling is not about temperature, it's a process. | 0:37:43 | 0:37:46 | |
It's molecules of liquid leaving and going into the gas. | 0:37:46 | 0:37:49 | |
That's what was happening there, but not because it was hot, | 0:37:49 | 0:37:52 | |
because it was such a low pressure around it. | 0:37:52 | 0:37:54 | |
Toby, thank you so much. | 0:37:54 | 0:37:55 | |
Don't ever, ever, ever go into space without a spacesuit. | 0:37:55 | 0:37:58 | |
That's the best health advice I can give you. | 0:37:58 | 0:38:00 | |
Off you go. Thank you. | 0:38:00 | 0:38:02 | |
All right. Now, that was ugly, wasn't it? Ooooh! | 0:38:09 | 0:38:11 | |
So, this, of course, | 0:38:11 | 0:38:13 | |
is a spacesuit and it is a beautiful piece of engineering. | 0:38:13 | 0:38:16 | |
This spacesuit was designed for astronaut Helen Sharman | 0:38:16 | 0:38:20 | |
when she went on her Juno mission 25 years ago. | 0:38:20 | 0:38:22 | |
And I could tell you about it | 0:38:22 | 0:38:24 | |
but I rather think that the best person | 0:38:24 | 0:38:27 | |
to tell you about Helen Sharman's spacesuit is... | 0:38:27 | 0:38:31 | |
Dr Helen Sharman, our first British astronaut. | 0:38:31 | 0:38:34 | |
Dr Sharman. APPLAUSE | 0:38:34 | 0:38:37 | |
Right, now... | 0:38:41 | 0:38:43 | |
Now, Helen, it's such a great honour to meet you. | 0:38:53 | 0:38:55 | |
This is a very precious item. | 0:38:55 | 0:38:57 | |
It's usually stored behind glass at the National Science... | 0:38:57 | 0:39:00 | |
National Space Centre in Leicester. It hasn't been into space, has it? | 0:39:00 | 0:39:04 | |
No, this is a replica. | 0:39:04 | 0:39:06 | |
The real spacesuit that I actually wore in space | 0:39:06 | 0:39:08 | |
is in the Science Museum in London, but this is very similar. | 0:39:08 | 0:39:12 | |
It's identical as far as I can see, | 0:39:12 | 0:39:13 | |
down to the mirror on the left-hand side. | 0:39:13 | 0:39:15 | |
-We're not allowed to touch it. -We're not allowed to touch it? | 0:39:15 | 0:39:18 | |
-DR SHARMAN SHRIEKS -A real live astronaut! | 0:39:18 | 0:39:21 | |
So you have found a slightly less precious spacesuit! | 0:39:21 | 0:39:24 | |
So we can talk about this. Now, tell me about this suit. | 0:39:24 | 0:39:27 | |
So, tell me, Helen, about this suit. | 0:39:27 | 0:39:29 | |
This is one we can really touch, can't we? Very similar. | 0:39:29 | 0:39:32 | |
This would have been, I assume, | 0:39:32 | 0:39:34 | |
made for somebody to do their training in. | 0:39:34 | 0:39:36 | |
It's... It feels quite warm, doesn't it? Yeah, | 0:39:36 | 0:39:39 | |
you're getting quite warm in there. | 0:39:39 | 0:39:41 | |
So normally you would wear your suit | 0:39:41 | 0:39:42 | |
and if you are actually sitting inside your spacecraft, | 0:39:42 | 0:39:45 | |
or indeed if you're walking to the spacecraft, | 0:39:45 | 0:39:48 | |
because it gets very hot... How can you lose heat inside the spacesuit? | 0:39:48 | 0:39:52 | |
There's a little bit that you might be able | 0:39:52 | 0:39:54 | |
to lose heat from your face. | 0:39:54 | 0:39:55 | |
It gets hot, so you've got a great big pipe here. | 0:39:55 | 0:39:57 | |
Now, this plugs into a ventilator unit | 0:39:57 | 0:39:59 | |
and air from the spacecraft, or from the air, | 0:39:59 | 0:40:02 | |
gets pulled through the spacesuit | 0:40:02 | 0:40:04 | |
and there are pipes running all the way through it, | 0:40:04 | 0:40:06 | |
right down to your feet. | 0:40:06 | 0:40:08 | |
They come up to just underneath your face here | 0:40:08 | 0:40:10 | |
and they run right down into your gloves, | 0:40:10 | 0:40:12 | |
and that tends to keep you cooler inside. | 0:40:12 | 0:40:14 | |
So I really pity you just now, | 0:40:14 | 0:40:16 | |
because you're actually getting very hot inside, aren't you?! | 0:40:16 | 0:40:19 | |
Alexandra, how does it feel being in there? | 0:40:19 | 0:40:21 | |
-Very heavy! -Very heavy! | 0:40:21 | 0:40:23 | |
And Helen, what is this thing here? | 0:40:23 | 0:40:24 | |
So this is a pressure regulator valve. | 0:40:24 | 0:40:27 | |
So if you need to inflate the suit while you're in space... | 0:40:27 | 0:40:30 | |
Let's say that unfortunately the air has let out of your spacecraft, | 0:40:30 | 0:40:33 | |
you close your helmet. | 0:40:33 | 0:40:35 | |
The oxygen supply comes in through this smaller pipe, | 0:40:35 | 0:40:38 | |
here on the left, | 0:40:38 | 0:40:39 | |
and it keeps the spacesuit inflated. | 0:40:39 | 0:40:43 | |
And this pressure valve here regulates the pressure inside. | 0:40:43 | 0:40:46 | |
What you really want is for the suit to be inflated | 0:40:46 | 0:40:49 | |
at a pressure of about 0.4 of an atmosphere. | 0:40:49 | 0:40:52 | |
Oxygen is in here, not air, | 0:40:52 | 0:40:54 | |
so 0.4 of an atmosphere, but it's full of oxygen, is fine. | 0:40:54 | 0:40:56 | |
But it inflates the spacesuit. | 0:40:56 | 0:41:00 | |
So although it's strong on the outside, | 0:41:00 | 0:41:02 | |
it becomes really stiff - | 0:41:02 | 0:41:04 | |
really stiff, so it's hard to move. | 0:41:04 | 0:41:06 | |
That's fine if you're just sitting in your seat like this | 0:41:06 | 0:41:09 | |
but if you do need to get out and do some manoeuvres, | 0:41:09 | 0:41:12 | |
it's so difficult to move, you can't. | 0:41:12 | 0:41:14 | |
And you would use up so much energy. | 0:41:14 | 0:41:16 | |
So what you can do is you can use this valve here | 0:41:16 | 0:41:19 | |
to decrease the pressure. | 0:41:19 | 0:41:20 | |
You look at the manometer on your wrist here | 0:41:20 | 0:41:23 | |
and then that will show that you've decreased the pressure | 0:41:23 | 0:41:26 | |
from 0.4 of an atmosphere to 0.26 atmosphere. | 0:41:26 | 0:41:30 | |
Very, very low pressure. So the suit deflates a little bit. | 0:41:30 | 0:41:33 | |
Still got a bit of oxygen in, so it's enough to breathe, | 0:41:33 | 0:41:36 | |
it supports life, but that pressure is low. | 0:41:36 | 0:41:39 | |
So low that you would get the bends if you stayed in that for very long. | 0:41:39 | 0:41:42 | |
So you can do that for about a quarter of an hour | 0:41:42 | 0:41:44 | |
while you do whatever it is you need to do | 0:41:44 | 0:41:46 | |
and then you sit back down in your seat, | 0:41:46 | 0:41:48 | |
increase the pressure again... | 0:41:48 | 0:41:50 | |
You can do that repeatedly, | 0:41:50 | 0:41:52 | |
but you can't keep it at 0.26 of an atmosphere for very long. | 0:41:52 | 0:41:54 | |
It weighs 10kg on Earth, | 0:41:54 | 0:41:56 | |
although of course it weighs nothing if you're orbiting the Earth. | 0:41:56 | 0:41:59 | |
This is your mini spacecraft, really, isn't it? | 0:41:59 | 0:42:01 | |
So it's like having a spacecraft inside a spacecraft. | 0:42:01 | 0:42:04 | |
So it really has to support your life | 0:42:04 | 0:42:06 | |
for as long as you need to get back to Earth. | 0:42:06 | 0:42:08 | |
So it looks like, Alexandra, | 0:42:08 | 0:42:09 | |
you're not really enjoying being inside that spacesuit. | 0:42:09 | 0:42:12 | |
So I think I'm going to send you away | 0:42:12 | 0:42:14 | |
to get into something a bit more comfortable! | 0:42:14 | 0:42:16 | |
This is the last layer of defence astronauts have | 0:42:16 | 0:42:18 | |
against the hostility of the environment around them. | 0:42:18 | 0:42:21 | |
But for now, Alexandra, I think... | 0:42:21 | 0:42:23 | |
It is a bit smelly, that suit! Is that how it came? | 0:42:23 | 0:42:26 | |
All right, your suit doesn't smell like that I hope, Helen. | 0:42:26 | 0:42:29 | |
Well, I don't know, I haven't been that close! | 0:42:29 | 0:42:31 | |
-No, it's OK! -Alexandra, thank you so much. Helen, Thank you. | 0:42:31 | 0:42:35 | |
APPLAUSE DROWNS OUT SPEECH | 0:42:35 | 0:42:37 | |
So that's incredible. | 0:42:47 | 0:42:49 | |
So we've seen our spacesuit and the crew are still on mission. | 0:42:49 | 0:42:51 | |
They're still racing away from the Earth. | 0:42:51 | 0:42:53 | |
They're still in the atmosphere. | 0:42:53 | 0:42:55 | |
They're travelling at many times the speed of sound. | 0:42:55 | 0:42:57 | |
And the atmosphere is still thick enough | 0:42:57 | 0:42:59 | |
to press on that vehicle, | 0:42:59 | 0:43:01 | |
to cause all sorts of shearing forces trying to rip the vehicle apart. | 0:43:01 | 0:43:05 | |
And now there is so much energy around | 0:43:05 | 0:43:08 | |
that threat comes from some unexpected sources. | 0:43:08 | 0:43:10 | |
It's not just heat, it's not just light, | 0:43:10 | 0:43:13 | |
it's vibration and it's sounds. | 0:43:13 | 0:43:16 | |
Now, you don't think of those things as being destructive forces | 0:43:16 | 0:43:19 | |
but they are. | 0:43:19 | 0:43:21 | |
And to show you, I need a volunteer, | 0:43:21 | 0:43:23 | |
preferably someone who is really, really good at singing. | 0:43:23 | 0:43:27 | |
LAUGHTER | 0:43:27 | 0:43:29 | |
That sorts people out! | 0:43:29 | 0:43:31 | |
-Are you really good at singing? -All right. | 0:43:31 | 0:43:34 | |
OK, well, let's have a go! Let's take you down. | 0:43:34 | 0:43:37 | |
Brilliant, fantastic. | 0:43:37 | 0:43:38 | |
Brilliant, OK. | 0:43:41 | 0:43:42 | |
-Come and stand here. And what's your name? -Aoife. | 0:43:45 | 0:43:48 | |
Aoife, we are going to try and use your voice to break this glass. | 0:43:48 | 0:43:54 | |
All right? So over here we have a microphone, OK? | 0:43:54 | 0:44:00 | |
And to help you with that note, | 0:44:00 | 0:44:02 | |
we've got the same note playing in these earphones. | 0:44:02 | 0:44:05 | |
SNIPPET OF NOTE | 0:44:05 | 0:44:06 | |
So that should be about the right note | 0:44:06 | 0:44:08 | |
so that that note corresponds with the natural frequency of this glass | 0:44:08 | 0:44:13 | |
so it goes into resonance. | 0:44:13 | 0:44:14 | |
So you want to get the molecules of the glass vibrating | 0:44:14 | 0:44:17 | |
like the sound energy in the voice of Aoife, here, | 0:44:17 | 0:44:22 | |
to show you just how destructive sound can be. | 0:44:22 | 0:44:24 | |
Now, Aoife, this is really hard to do. | 0:44:24 | 0:44:26 | |
I will tell you now, I had a go, | 0:44:26 | 0:44:29 | |
but I'm a rubbish singer, so I'm expecting greatness from you! | 0:44:29 | 0:44:32 | |
OK, so, ready, steady, go... | 0:44:32 | 0:44:35 | |
# A-a-a-a-a-a-a-a-a-a-ah | 0:44:35 | 0:44:38 | |
# A-a-a-a-a-a-a-a-a-a-ah. # | 0:44:39 | 0:44:44 | |
Oh! | 0:44:44 | 0:44:45 | |
# A-a-a-a-a-a-a-a-a-a-ah. # | 0:44:45 | 0:44:49 | |
Oh, close! Aoife, good try, good try! | 0:44:51 | 0:44:54 | |
APPLAUSE | 0:44:54 | 0:44:56 | |
Aoife, there is someone who can do this, | 0:44:58 | 0:45:01 | |
and that is the amazing Lucy Haken, who is my producer, | 0:45:01 | 0:45:05 | |
who tells me she can, which is why we are here. | 0:45:05 | 0:45:08 | |
So ladies and gentlemen, Lucy Haken! | 0:45:08 | 0:45:10 | |
I would protect your ears, here, not cos Lucy is terrible at singing | 0:45:17 | 0:45:20 | |
but because it's just very, very loud. | 0:45:20 | 0:45:22 | |
OK, let's have a go. | 0:45:22 | 0:45:23 | |
# A-a-a-a-a-a-a-a-a-a-ah | 0:45:26 | 0:45:32 | |
# A-a-a-a-a-a-a-a-a-a-ah. # | 0:45:34 | 0:45:43 | |
Oh! | 0:45:43 | 0:45:44 | |
CHEERING AND APPLAUSE | 0:45:44 | 0:45:47 | |
Aoife, she broke the glass, but you're the much better singer! | 0:46:05 | 0:46:08 | |
Thank you so much, cheers! | 0:46:08 | 0:46:10 | |
And so, right now they are still moving on with their mission. | 0:46:17 | 0:46:21 | |
They're getting up to the point | 0:46:21 | 0:46:23 | |
where booster sep is about to occur. | 0:46:23 | 0:46:26 | |
At one minute, 58 seconds, the boosters separate. | 0:46:26 | 0:46:30 | |
And they still have to pull off one more trick to get into space. | 0:46:30 | 0:46:34 | |
And to explain what trick that is, I'm going to need one volunteer. | 0:46:34 | 0:46:39 | |
Hmmm... | 0:46:39 | 0:46:42 | |
All right, let's go up here this time. | 0:46:42 | 0:46:43 | |
How about you, right at the back there? | 0:46:43 | 0:46:45 | |
Yeah, yeah, let's bring you down. | 0:46:45 | 0:46:47 | |
And I need one more volunteer... | 0:46:56 | 0:46:58 | |
..someone who has travelled at 25 times the speed of sound. | 0:46:59 | 0:47:02 | |
Which probably means you, Mike, doesn't it? Mike Barratt. | 0:47:02 | 0:47:06 | |
-Now, what's your name? -John. -John. | 0:47:09 | 0:47:13 | |
John, Mike, I am going to turn you into rocket engines here. | 0:47:13 | 0:47:17 | |
This is our rocket. | 0:47:17 | 0:47:18 | |
These bags are your propellant | 0:47:18 | 0:47:20 | |
and you know, because Isaac Newton told us, | 0:47:20 | 0:47:22 | |
that if you throw your propellant out the back, | 0:47:22 | 0:47:24 | |
your rocket will go in that direction. | 0:47:24 | 0:47:25 | |
Now, if you get as far as this line, you have got to the space station. | 0:47:25 | 0:47:29 | |
That's what we have got to do by throwing those bags out that way, OK? | 0:47:29 | 0:47:33 | |
So I'm going to load you on board now and, Mike, | 0:47:33 | 0:47:35 | |
if you would board at the bottom there, | 0:47:35 | 0:47:37 | |
so you're the top of the rocket and Mike is at the bottom. All right. | 0:47:37 | 0:47:42 | |
And try not to break the astronaut as you throw them! | 0:47:42 | 0:47:45 | |
Because that's super-embarrassing when we return him to Nasa. | 0:47:45 | 0:47:48 | |
-All right? -You've got my back, John. -Everyone - three, two, one, | 0:47:48 | 0:47:53 | |
go! | 0:47:53 | 0:47:54 | |
Oh, so close! | 0:48:03 | 0:48:04 | |
Oh... What a disaster! You didn't get to the space station. | 0:48:06 | 0:48:10 | |
You're floating in space. | 0:48:10 | 0:48:11 | |
OK. | 0:48:20 | 0:48:21 | |
So let's try that again but let's try that | 0:48:21 | 0:48:24 | |
the way that Tim's rocket and the Soyuz dealt with it. | 0:48:24 | 0:48:27 | |
This time, we're going to do a staging. | 0:48:27 | 0:48:29 | |
So Mike is going to be the first stage | 0:48:29 | 0:48:32 | |
and you're going to be the second stage, OK? | 0:48:32 | 0:48:34 | |
So when I say, "Three, two, one, first stage," | 0:48:34 | 0:48:38 | |
Mike's going to chuck all his fuel out. | 0:48:38 | 0:48:40 | |
When I say, "Second stage, go," you chuck your fuel out, OK? | 0:48:40 | 0:48:43 | |
But that won't be until you've separated from his stage. All right? | 0:48:43 | 0:48:45 | |
So you are going to get rid of the dead weight | 0:48:45 | 0:48:48 | |
that is astronaut Mike Barratt ... | 0:48:48 | 0:48:50 | |
LAUGHTER ..after he's got rid of his fuel. | 0:48:50 | 0:48:52 | |
OK, you got that? So, three, two, one, | 0:48:52 | 0:48:55 | |
first stage! | 0:48:55 | 0:48:57 | |
And let's separate. | 0:49:03 | 0:49:05 | |
Go, second stage! | 0:49:05 | 0:49:06 | |
CHEERING AND APPLAUSE | 0:49:09 | 0:49:11 | |
High five! | 0:49:16 | 0:49:18 | |
Congratulations. You made it! | 0:49:18 | 0:49:20 | |
And that's how you get yourself into space. | 0:49:21 | 0:49:24 | |
You get rid of that stage. Once it's got rid of its fuel, | 0:49:24 | 0:49:26 | |
you get rid of the lower stage. | 0:49:26 | 0:49:28 | |
Even if Mike's aboard it! Well done. | 0:49:28 | 0:49:30 | |
Good job. | 0:49:30 | 0:49:31 | |
And now over to Tim. | 0:49:37 | 0:49:39 | |
I'm really looking forward to experiencing the stage separations. | 0:49:39 | 0:49:42 | |
You go from high-G to low-G, | 0:49:42 | 0:49:43 | |
you get kind of a tumbling sensation. | 0:49:43 | 0:49:45 | |
And also when the fairing is jettisoned, | 0:49:45 | 0:49:48 | |
once you've left most of Earth's atmosphere, | 0:49:48 | 0:49:50 | |
that is when you first get to see the sun, | 0:49:50 | 0:49:52 | |
or if it's at night then you get to see planet Earth. | 0:49:52 | 0:49:55 | |
And so you've both been there. | 0:49:56 | 0:49:58 | |
How does that feel, that moment when you're getting out there into space? | 0:49:58 | 0:50:01 | |
The actual moment that Mike explained about | 0:50:01 | 0:50:03 | |
when you suddenly go from about 3G to 0G, I was... | 0:50:03 | 0:50:07 | |
It was a delightful feeling because the spacesuit is so hot | 0:50:07 | 0:50:10 | |
but for the first time, | 0:50:10 | 0:50:12 | |
the ventilation can actually go behind your back, | 0:50:12 | 0:50:14 | |
cos you're floating sort of between the seat and your straps, | 0:50:14 | 0:50:17 | |
so the ventilation can go and dry some of the sweat off. | 0:50:17 | 0:50:20 | |
And then when you unstrap and you just float out, | 0:50:20 | 0:50:22 | |
-isn't that a wonderful free feeling? -Liberating. Absolutely. | 0:50:22 | 0:50:26 | |
It's that freedom of floating. | 0:50:26 | 0:50:27 | |
And of course it never stops, does it? | 0:50:27 | 0:50:29 | |
It just keeps on going and going. And you forget what it's like. | 0:50:29 | 0:50:32 | |
I mean, right now I can actually feel the seat beneath me. | 0:50:32 | 0:50:35 | |
And I'm sure if you actually think about it, | 0:50:35 | 0:50:37 | |
you can actually feel the floor beneath your feet. | 0:50:37 | 0:50:39 | |
-You forget what it's like to stand up or sit down. -Yeah. | 0:50:39 | 0:50:43 | |
And best memory for you of that, Mike? | 0:50:43 | 0:50:45 | |
Well, fortunately the Soyuz is very small so you don't float very far. | 0:50:45 | 0:50:48 | |
But the first place you float to is to the window | 0:50:48 | 0:50:51 | |
and I think looking out the window to the Earth | 0:50:51 | 0:50:53 | |
was absolutely my best memory. | 0:50:53 | 0:50:55 | |
But also just to know that you've made it through ascent | 0:50:55 | 0:50:58 | |
and you're in orbit is just a great feeling, | 0:50:58 | 0:51:01 | |
because everything went right. | 0:51:01 | 0:51:02 | |
Fantastic. Well, stay here, guys, we're not finished yet! | 0:51:02 | 0:51:07 | |
But at least we are in orbit. | 0:51:07 | 0:51:09 | |
But they're just not quite in the right orbit yet. | 0:51:09 | 0:51:13 | |
The ISS is up above them, | 0:51:13 | 0:51:15 | |
circling the Earth 250 miles above the surface of the Earth, | 0:51:15 | 0:51:19 | |
travelling at 17,500 miles an hour. | 0:51:19 | 0:51:22 | |
The Soyuz still has to climb to get there. | 0:51:22 | 0:51:25 | |
And the question is, how are they going to do that? | 0:51:25 | 0:51:28 | |
And that's much trickier than you think. | 0:51:28 | 0:51:30 | |
And to show you that, I'm going to need the help of a volunteer. | 0:51:30 | 0:51:35 | |
OK, so... | 0:51:35 | 0:51:37 | |
Let's have... | 0:51:37 | 0:51:39 | |
you. Let's come down. | 0:51:39 | 0:51:41 | |
-Now, what's your name? -Kaushik. -Kaushik, OK. | 0:51:52 | 0:51:55 | |
So this is our orbital rendezvous demonstrator. All right? | 0:51:55 | 0:51:59 | |
And here's how it works. | 0:51:59 | 0:52:00 | |
You pull that trigger and these cars are going round. | 0:52:00 | 0:52:02 | |
Now, one is going faster round the Earth than the other one. | 0:52:02 | 0:52:06 | |
Your speed and where you are in your orbit are inseparable. | 0:52:06 | 0:52:09 | |
So when you're close to the Earth, you're going around the Earth faster, | 0:52:09 | 0:52:13 | |
when you're high in an orbit, like the ISS is, | 0:52:13 | 0:52:16 | |
you're going slower. | 0:52:16 | 0:52:18 | |
So if we let this string out here, | 0:52:18 | 0:52:22 | |
you can go higher but you're travelling slower again. | 0:52:22 | 0:52:25 | |
So let's see if you can get yourself to dock with the ISS, all right? | 0:52:25 | 0:52:29 | |
So if you turn it to the right, it goes out, | 0:52:29 | 0:52:31 | |
turn it to the left, it goes down. | 0:52:31 | 0:52:33 | |
All right, that's my favourite Christmas toy, that one! | 0:52:33 | 0:52:36 | |
So pull the trigger and have a go. | 0:52:36 | 0:52:37 | |
Now, this is what it's like, | 0:52:37 | 0:52:39 | |
this is why orbital mechanics are so difficult, | 0:52:39 | 0:52:41 | |
because your speed is not independent of your position. | 0:52:41 | 0:52:45 | |
If you're higher in orbit, you're close to the space station | 0:52:45 | 0:52:49 | |
but you're travelling more slowly so you have to time your run. | 0:52:49 | 0:52:51 | |
If you want to catch up with it now, | 0:52:51 | 0:52:53 | |
you have to drop down to a lower orbit. | 0:52:53 | 0:52:55 | |
That's good. You've got to catch up. | 0:52:55 | 0:52:57 | |
And now you're going to have to time your run | 0:52:57 | 0:52:59 | |
so that you get close to the ISS. | 0:52:59 | 0:53:00 | |
Now let's try and get up close because truthfully... | 0:53:00 | 0:53:02 | |
Oh, here we go! | 0:53:02 | 0:53:04 | |
Oooooh! | 0:53:04 | 0:53:06 | |
CHEERING AND APPLAUSE | 0:53:06 | 0:53:08 | |
I have never seen anyone do that first time! | 0:53:23 | 0:53:26 | |
-Are you an astronaut by any chance? -Not really. | 0:53:28 | 0:53:30 | |
Well, that was very impressive, Kaushik, thank you so much. | 0:53:30 | 0:53:33 | |
Take your seat! APPLAUSE | 0:53:33 | 0:53:35 | |
So that's how that works. | 0:53:39 | 0:53:40 | |
That's how you manoeuvre yourself around in space, | 0:53:40 | 0:53:43 | |
with that sort of reaction. | 0:53:43 | 0:53:45 | |
And that's where we've got to in Tim's mission. | 0:53:45 | 0:53:47 | |
We'll go forwards now, | 0:53:47 | 0:53:49 | |
to six hours and 30 minutes after Tim has launched. | 0:53:49 | 0:53:54 | |
And he is now approaching Space Station. | 0:53:54 | 0:53:57 | |
We're going to see some film of that as they approach | 0:53:57 | 0:54:01 | |
up here on the screen. | 0:54:01 | 0:54:02 | |
And they're pulling close and that is Tim's vehicle approaching. | 0:54:02 | 0:54:07 | |
And of course, there are two people in our audience | 0:54:07 | 0:54:09 | |
who know exactly what that feels like, so I am going to ask you | 0:54:09 | 0:54:12 | |
to welcome back astronauts Helen Sharman and Mike Barratt. | 0:54:12 | 0:54:16 | |
Thank you. | 0:54:16 | 0:54:17 | |
So this is six hours, 30 minutes, | 0:54:26 | 0:54:28 | |
they're approaching the space station. | 0:54:28 | 0:54:31 | |
-Do you guys remember this from your missions? -I remember. | 0:54:31 | 0:54:34 | |
-You can forget it, can you? -No. -Nobody celebrates. | 0:54:34 | 0:54:37 | |
Nobody in Star City celebrates the launch. | 0:54:37 | 0:54:40 | |
You celebrate the docking, | 0:54:40 | 0:54:41 | |
cos that's when you know that you're there safely. | 0:54:41 | 0:54:44 | |
And we were actually 200km away when we knew | 0:54:44 | 0:54:45 | |
that we weren't going to make it automatically | 0:54:45 | 0:54:47 | |
and we took over manual. But you had a different experience, didn't you? | 0:54:47 | 0:54:51 | |
So we were about a little more than 100 metres out, | 0:54:51 | 0:54:54 | |
and we had a failure of one of the sensors on the engines. | 0:54:54 | 0:54:57 | |
And the guidance computer didn't like it | 0:54:57 | 0:54:59 | |
so it said switch over to manual and fly that in. | 0:54:59 | 0:55:01 | |
And Tim's docking actually turned out | 0:55:01 | 0:55:04 | |
to be much, much more nervy than anyone thought it was going to be. | 0:55:04 | 0:55:07 | |
-What happened there, Mike? -So it was a very similar failure. | 0:55:07 | 0:55:10 | |
In fact, the same one that we had but it was inside of 20 metres. | 0:55:10 | 0:55:14 | |
So they were actually very close. | 0:55:14 | 0:55:15 | |
And whenever you have two spacecraft very close together, | 0:55:15 | 0:55:18 | |
you want to be sure that they're extremely tightly controlled. | 0:55:18 | 0:55:21 | |
Well, the computer didn't like what it saw | 0:55:21 | 0:55:23 | |
and so it told the spacecraft to back up. | 0:55:23 | 0:55:26 | |
And it did, very quickly. | 0:55:26 | 0:55:27 | |
In fact, if any of you watched it on TV, | 0:55:27 | 0:55:29 | |
you saw it beat a very hasty retreat | 0:55:29 | 0:55:31 | |
to a little bit more than 100 metres. | 0:55:31 | 0:55:33 | |
And that's as close as two vehicles have ever got in that procedure | 0:55:33 | 0:55:36 | |
-and had to back off. -I think that's about as close as we've come | 0:55:36 | 0:55:39 | |
before we had a failed to dock. | 0:55:39 | 0:55:40 | |
Now, to be sure that... | 0:55:40 | 0:55:42 | |
We trained to do this and Yuri Malenchenko, the commander, | 0:55:42 | 0:55:45 | |
was absolutely trained to do these manual dockings. | 0:55:45 | 0:55:47 | |
And the computer switched over to manual mode | 0:55:47 | 0:55:50 | |
and allowed Yuri to fly it, which he did beautifully. | 0:55:50 | 0:55:54 | |
So let's go forward one more time now. | 0:55:54 | 0:55:56 | |
Eight hours, 55 minutes after Tim has left the Earth. | 0:55:56 | 0:56:01 | |
They've docked to the space station, done their final checks, | 0:56:01 | 0:56:04 | |
and it's time to open the hatch. | 0:56:04 | 0:56:06 | |
Now, both of you know what that feels like, don't you? | 0:56:06 | 0:56:10 | |
Let's see what Tim thought he was going to feel like. | 0:56:10 | 0:56:13 | |
Once we dock to the International Space Station, | 0:56:13 | 0:56:15 | |
we've still got about two hours of leak checks to do | 0:56:15 | 0:56:18 | |
to make sure everything is safe for us | 0:56:18 | 0:56:20 | |
to open the hatch between the Soyuz spacecraft and the space station. | 0:56:20 | 0:56:23 | |
What will be great is the fact | 0:56:23 | 0:56:25 | |
that I'll be meeting Scott and Mikhail on board, | 0:56:25 | 0:56:28 | |
who are already eight months into their year-long stay. | 0:56:28 | 0:56:31 | |
I said goodbye to them in Star City | 0:56:31 | 0:56:33 | |
and it'll be great to see them again. | 0:56:33 | 0:56:35 | |
So, incredible. You've both been through that. | 0:56:35 | 0:56:37 | |
I could see Scott Kelly up there. | 0:56:37 | 0:56:39 | |
-He's a buddy of yours. -Yeah, he's a good friend of mine. | 0:56:39 | 0:56:41 | |
-We flew together actually. -And you've been through that. | 0:56:41 | 0:56:44 | |
What's it like getting aboard the space station, Mike? | 0:56:44 | 0:56:46 | |
Well, the space station is huge | 0:56:46 | 0:56:48 | |
and when you compare that to the tiny confines of the Soyuz, | 0:56:48 | 0:56:51 | |
it is a big, dramatic change. | 0:56:51 | 0:56:53 | |
All of a sudden, you're in a massive station the size of a 747, | 0:56:53 | 0:56:58 | |
if any of you have been on that. | 0:56:58 | 0:57:00 | |
And so all of a sudden you have a lot of room to manoeuvre | 0:57:00 | 0:57:02 | |
and after two days in the Soyuz, | 0:57:02 | 0:57:04 | |
it was kind of nice to have the room. | 0:57:04 | 0:57:05 | |
Well, it's fantastic to see everyone aboard the space station. | 0:57:05 | 0:57:08 | |
Mike Barratt, Helen Sharman, | 0:57:08 | 0:57:10 | |
thank you so much for joining us tonight. | 0:57:10 | 0:57:12 | |
It was fantastic to see you. | 0:57:12 | 0:57:13 | |
APPLAUSE DROWNS OUT SPEECH | 0:57:13 | 0:57:16 | |
And we have one final message from Tim. | 0:57:32 | 0:57:35 | |
That's all for now. | 0:57:37 | 0:57:38 | |
Looking forward to talking to you again | 0:57:38 | 0:57:39 | |
at the next Christmas Lectures. | 0:57:39 | 0:57:41 | |
Fingers crossed! Good luck. | 0:57:41 | 0:57:44 | |
And that brings us to the end of the first of our lectures. | 0:57:51 | 0:57:54 | |
The crew have survived launch, they've survived orbital rendezvous, | 0:57:54 | 0:57:57 | |
they've survived the docking and they are safely aboard the space station. | 0:57:57 | 0:58:01 | |
And next time we'll be finding out as Tim begins | 0:58:01 | 0:58:05 | |
his six-month expedition aboard the International Space Station | 0:58:05 | 0:58:09 | |
not just how to survive in space, | 0:58:09 | 0:58:11 | |
but how to live and work there | 0:58:11 | 0:58:12 | |
and what you do if something goes really, really wrong. | 0:58:12 | 0:58:16 | |
And also, even more exciting | 0:58:16 | 0:58:19 | |
is we'll be having the first recorded message from Tim from the ISS. | 0:58:19 | 0:58:24 | |
But for now, I am Dr Kevin Fong | 0:58:24 | 0:58:27 | |
and this has been How To Survive In Space. | 0:58:27 | 0:58:31 | |
APPLAUSE | 0:58:31 | 0:58:33 |