0:00:02 > 0:00:06This week on Doctor Who, Amy finds herself stuck in the TARDIS.
0:00:06 > 0:00:11So I join Confidential and hope to take us out of this world at the Royal Observatory in Greenwich.
0:00:11 > 0:00:15Life on other planets...
0:00:15 > 0:00:17could quite possibly exist?
0:00:17 > 0:00:23- It's quite likely because there are so many planets out there, but it may not be life as we know it.- Excellent.
0:00:23 > 0:00:25# I am a woman on a mission... #
0:00:25 > 0:00:28I actually can't believe that's real. That's real.
0:00:28 > 0:00:35The King's Arms meet The Rising Sun in the battle of the pub teams, that's coming up later in the show.
0:00:35 > 0:00:38And it's Craig Owens passing to the Doctor.
0:00:38 > 0:00:40Oh, nice footwork.
0:00:40 > 0:00:43Impressive start from the gangling Gallifreyan.
0:00:43 > 0:00:46He's still going. Look at this.
0:00:46 > 0:00:48Best day's filming ever on Doctor Who today.
0:00:48 > 0:00:51Not cos of JC, but cos we're playing football.
0:01:23 > 0:01:25Hello, Confidential, it's me.
0:01:25 > 0:01:31So, the Doctor was dealing with the time loop, and Amy was stuck in the TARDIS in space,
0:01:31 > 0:01:35so I'm at the home of time and space at the Royal Observatory, Greenwich,
0:01:35 > 0:01:38to find out all about time and space and do time loops even exist?
0:01:38 > 0:01:42- I'm meeting Dr Maggie Aderin-Pocock...- Hello!
0:01:42 > 0:01:46..who is a space scientist, to find out what the time is.
0:01:46 > 0:01:50- Ah.- So, Maggie, tell us why we're here today.
0:01:50 > 0:01:54As you said, Greenwich is the home of time and space.
0:01:54 > 0:01:57This is an active astronomical site. We have an active telescope
0:01:57 > 0:01:59which is educating the public,
0:01:59 > 0:02:02and the Astronomer Royal for the UK used to actually live here.
0:02:02 > 0:02:05So space and astronomy play a vital role here.
0:02:05 > 0:02:07But time is critical here, as well.
0:02:07 > 0:02:10Every new day here on planet Earth starts here at the prime meridian.
0:02:10 > 0:02:13And what exactly is this meridian line?
0:02:13 > 0:02:16I can actually show you the prime meridian, so step this way.
0:02:16 > 0:02:17Ooh!
0:02:24 > 0:02:26So, this is the meridian?
0:02:26 > 0:02:31- No, no, this is the prime meridian. - The prime meridian, I'm very sorry.
0:02:31 > 0:02:36Meridians are imaginary lines that run from the North Pole to the South Pole, and we use them to gauge time.
0:02:36 > 0:02:40The Prime Meridian is this line and this is effectively the zero,
0:02:40 > 0:02:43the baseline that we do all other measurements from.
0:02:43 > 0:02:48How we're standing at the moment - you're in the western hemisphere and I'm in the eastern hemisphere.
0:02:48 > 0:02:50So we're having a conversation over hemispheres?
0:02:50 > 0:02:54Yes. This prime meridian line divides east from west.
0:02:54 > 0:02:59- So what happens if I do this?- Now you are in both hemispheres at once.
0:02:59 > 0:03:02Look at me, I'm in two hemispheres! I'm like dancing over hemispheres.
0:03:02 > 0:03:05Dancing across the hemispheres.
0:03:05 > 0:03:09Cool, so, essentially this is the line where time begins.
0:03:09 > 0:03:10It is. This is where time begins.
0:03:10 > 0:03:12Every new day starts along this line.
0:03:12 > 0:03:15It could have been anywhere, it didn't have to be Greenwich.
0:03:15 > 0:03:18In the old days, different places had different times -
0:03:18 > 0:03:23there could be a five-minute time difference between Bristol and London, which didn't matter,
0:03:23 > 0:03:26but as communication and transportation got better,
0:03:26 > 0:03:30people had to reset their watches when they went to a different town!
0:03:30 > 0:03:35So people across the world came together and said they needed a universal time.
0:03:35 > 0:03:40As you go across the world, you have different times, but you need a baseline to measure it from.
0:03:40 > 0:03:46After a long, protracted conversation and a vote, they decided to put it here in Greenwich.
0:03:46 > 0:03:48'We'll return to the observatory later,
0:03:48 > 0:03:52'as I want to find out more about the science behind the episodes of Doctor Who.'
0:03:52 > 0:03:58On set, the cast and crew get ready to shoot what could be the beginning of a beautiful relationship.
0:03:58 > 0:03:59Action!
0:03:59 > 0:04:03- So what's the plan tonight? Pizza, booze, telly? - Yeah, pizza, booze, telly.
0:04:03 > 0:04:06- LOUD BANG - What is he doing up there?
0:04:06 > 0:04:10- Did you put the advert up yet? - Yeah, in the paper shop window.
0:04:10 > 0:04:12"One furnished room available immediately,
0:04:12 > 0:04:18"shared kitchen, bathroom with 27-year-old male non-smoker, £400 pcm, suit young professional."
0:04:18 > 0:04:24Pretty much any guy who's single who has a really close female friend
0:04:24 > 0:04:27who he always says, "We're just friends,"
0:04:27 > 0:04:31he's probably in love with her, and that's no different than with Craig.
0:04:31 > 0:04:35That's your mission in life, Craig - find me a man.
0:04:35 > 0:04:37Yeah, otherwise you'll have to settle for me.
0:04:37 > 0:04:40You'll have to settle for me first.
0:04:40 > 0:04:42When you're in that situation, it's quite galling.
0:04:42 > 0:04:46When you're looking at it from the outside, it's quite funny.
0:04:46 > 0:04:48I love you.
0:04:48 > 0:04:50Well, that's good, cos I'm your new lodger.
0:04:51 > 0:04:55- KAREN:- With two time-travel machines for Amy to contend with this week,
0:04:55 > 0:04:59I want to know if there really is the possibility of life on other planets.
0:04:59 > 0:05:03And who better to ask than a space scientist?
0:05:03 > 0:05:07Here we are in the Planetarium in the Royal Observatory.
0:05:07 > 0:05:11So I'm still with Maggie, who hopefully has all the answers.
0:05:11 > 0:05:15You and the Doctor travel through space-time, through science fiction,
0:05:15 > 0:05:18but I want to take you on a tour of the real universe.
0:05:18 > 0:05:20This is Planet Earth where we live.
0:05:20 > 0:05:24Earth is quite amazing, because as we go through our journey,
0:05:24 > 0:05:28you'll see Earth is covered in water. Four-fifths of its surface is water.
0:05:28 > 0:05:33About four-fifths of our body is water, so we're very much a product of the planet we live on.
0:05:33 > 0:05:38We've zoomed into the centre of our solar system, and here's the sun.
0:05:38 > 0:05:40We've got a sunspot drifting past.
0:05:40 > 0:05:43The sun provides us with virtually all the energy we use on Earth,
0:05:43 > 0:05:48so the Sun is the powerhouse, and it keeps all the other planets orbiting.
0:05:48 > 0:05:53And here we have the planets of the inner solar system, Mercury, Venus, Earth and Mars.
0:05:53 > 0:05:58Time's sped up here, because it takes Earth a year to go round the Sun and here it's just taking a few seconds.
0:05:58 > 0:06:05We're zooming out. We've got the Sun in the centre and now we're seeing all the planets in our solar system.
0:06:05 > 0:06:09What we want to do next is we want to go and visit the planet Jupiter.
0:06:09 > 0:06:12Jupiter is the largest planet in our solar system.
0:06:12 > 0:06:15In fact, you could fit 1,000 Earths into Jupiter.
0:06:15 > 0:06:17- So it's pretty massive.- Pretty big.
0:06:17 > 0:06:21But then again, you could fit 1,000 Jupiters into the Sun.
0:06:21 > 0:06:24So that it means you could fit a million Earths into the Sun.
0:06:24 > 0:06:26So the Sun is pretty huge.
0:06:26 > 0:06:28- So it is completely massive.- Yes.
0:06:28 > 0:06:31Now we're zooming out to our galaxy, the Milky Way,
0:06:31 > 0:06:34and you can see there is a plethora of stars out there.
0:06:34 > 0:06:37We live just on one of the spiral arms, rather boringly,
0:06:37 > 0:06:43but it's estimated that, in the Milky Way, there are about 150 billion stars.
0:06:43 > 0:06:45- It's a mind-boggling number!- What?!
0:06:45 > 0:06:48So life on other planets is quite possible?
0:06:48 > 0:06:53We think it's quite likely, because there are so many planets out there.
0:06:53 > 0:06:55But it might not be life as we know it.
0:06:58 > 0:07:02Travelling through time isn't the only thing the Doctor seems to be good at.
0:07:02 > 0:07:04He also has a nifty right foot.
0:07:04 > 0:07:06Let's just shoot some goals now.
0:07:06 > 0:07:08Let's shoot Matt scoring goals.
0:07:08 > 0:07:10The football match was very easy to do
0:07:10 > 0:07:14with little choreography, because Matt Smith's brilliant at football.
0:07:21 > 0:07:24A bit of volley. Comes in on the chest and I do...
0:07:24 > 0:07:27Right.
0:07:27 > 0:07:29I finish with my left foot. Header would be great.
0:07:29 > 0:07:31You can't escape the fact
0:07:31 > 0:07:35that he's really good at football. I think he used to play for Leicester.
0:07:35 > 0:07:40To play football as the Doctor, who scores all the goals and is the quickest and the best,
0:07:40 > 0:07:44it's like all the dreams coming true at once in a way, I suppose.
0:07:57 > 0:08:00Hello and welcome to a very special edition of Football Focus.
0:08:00 > 0:08:03The King's Arms broke new ground this week and made history
0:08:03 > 0:08:07with their signing of the first football Time Lord.
0:08:07 > 0:08:08Yes, it's the Doctor.
0:08:08 > 0:08:11Great excitement here at Victoria Park.
0:08:11 > 0:08:16The King's Arms unveiling their new stellar signing, it's the Doctor.
0:08:16 > 0:08:20Hang on to your boots. This could be out of this world.
0:08:20 > 0:08:23Today, the Doctor comes and plays for the King's Arms
0:08:23 > 0:08:25with his flatmate, Craig.
0:08:25 > 0:08:28And what a pairing the King's Arms boasts now
0:08:28 > 0:08:30with Craig Owens in great form.
0:08:30 > 0:08:35The Doctor and Owens, numbers 11 and 7, a pairing made in heaven.
0:08:38 > 0:08:42It's not only his debut for the King's Arms. It's... Well, his debut.
0:08:47 > 0:08:49Let the game begin.
0:08:49 > 0:08:53With the Doctor making his debut appearance, it's promised to be
0:08:53 > 0:08:58the Pub League match to rival all Pub League matches - the King's Arms against the Rising Sun.
0:08:58 > 0:09:02We can join Steve Wilson pitch-side at Victoria Park in Cardiff for highlights of the game.
0:09:02 > 0:09:05And this is how they line up.
0:09:05 > 0:09:08The King's Arms has chosen Craig Owens in his regular spot.
0:09:08 > 0:09:11This is what we've all been waiting for, though.
0:09:11 > 0:09:14The Doctor making his debut for the team,
0:09:14 > 0:09:17and a lot resting on his performance today.
0:09:17 > 0:09:20And the Rising Sun looking strong
0:09:20 > 0:09:22with a formation we've seen them use before.
0:09:22 > 0:09:24WHISTLE
0:09:24 > 0:09:27And it's Craig Owens passing to the Doctor.
0:09:27 > 0:09:29Oh, nice footwork.
0:09:29 > 0:09:32Impressive start from the gangling Gallifreyan.
0:09:32 > 0:09:35He's still going. Look at this.
0:09:37 > 0:09:41Oh, what a goal by the Doctor! It's 1-0 to the King's Arms.
0:09:42 > 0:09:43And he's off again.
0:09:43 > 0:09:46Magnificent footwork. And he's made it two!
0:09:46 > 0:09:49He's in magnificent form today.
0:09:54 > 0:09:56Oh, what timing by the Doctor!
0:09:56 > 0:09:58But what else would you expect?
0:09:58 > 0:09:59It's 3-0.
0:10:00 > 0:10:03Fantastic play by Owens.
0:10:03 > 0:10:05Oh, what a turn for a big man.
0:10:05 > 0:10:06Unlucky.
0:10:06 > 0:10:10The Doctor with a follow-up to make it four.
0:10:12 > 0:10:15Great chester by the Doctor, and that's five.
0:10:18 > 0:10:19It's six!
0:10:20 > 0:10:24Extraordinary! King's Arms seven.
0:10:24 > 0:10:26It's a free kick.
0:10:30 > 0:10:34And Craig Owens is ready to dispatch this in the back of the Rising Sun net.
0:10:34 > 0:10:38Assessing his angles... Oh, but the Doctor arrives.
0:10:38 > 0:10:40And it's eight!
0:10:40 > 0:10:43And Owens isn't happy.
0:10:43 > 0:10:48The Doctor stole his glory and he's hit eight.
0:10:52 > 0:10:54What a performance, and what a game.
0:10:54 > 0:10:59Owens doesn't look best pleased. The King's Arms have a new hero.
0:10:59 > 0:11:02It's the Doctor.
0:11:02 > 0:11:06Now I know a little bit about the science behind the science fiction,
0:11:06 > 0:11:09there's one more treat in store for me at the observatory.
0:11:09 > 0:11:11- We have something else for you. - Really?
0:11:11 > 0:11:17I'm going to introduce you to the public astronomer here at the observatory, Dr Marek Kukula,
0:11:17 > 0:11:19and he has a very nice surprise for you.
0:11:19 > 0:11:21- Then let us go.- Perfect.
0:11:21 > 0:11:22Come on.
0:11:22 > 0:11:26There's one more treat in store for me at the observatory,
0:11:26 > 0:11:29as Marek lets me take a look at the real sky at night
0:11:29 > 0:11:32with something truly out of this world.
0:11:40 > 0:11:43- So, Maggie promised you a surprise and here it is.- Wow!
0:11:43 > 0:11:46It's the biggest refracting telescope in the United Kingdom.
0:11:46 > 0:11:50- How big is it?- What's important with telescopes is the size of the lens,
0:11:50 > 0:11:54and this one has a lens which is 28 inches across,
0:11:54 > 0:11:56which is still about as big as you can make them.
0:11:56 > 0:11:59So even though this is 120 - almost - years old,
0:11:59 > 0:12:03- it really was the Hubble space telescope of its day.- Wow!
0:12:03 > 0:12:07- So the bigger the lens, the more we can see?- That's right.
0:12:07 > 0:12:11The bigger the lens, the more light you can get through, so the further out you can see into space.
0:12:11 > 0:12:14That's great for doing astronomy, where you want to explore
0:12:14 > 0:12:17as far out into the universe as you can possibly go.
0:12:17 > 0:12:20So let's get the dome open and then we can have a look at the sky.
0:12:20 > 0:12:22Let's go.
0:12:32 > 0:12:35Now we can see the sky, so let's move the telescope down.
0:12:35 > 0:12:40'With the telescope in place, I'm about to get the chance to see something totally amazing.
0:12:40 > 0:12:43'I have no idea what it is, but I'm very excited.'
0:12:43 > 0:12:46- Take a look and see what you think. - What is it?
0:12:48 > 0:12:50Oh, my goodness!
0:12:51 > 0:12:52That's real.
0:12:52 > 0:12:56I'm actually looking at Saturn right now.
0:12:56 > 0:12:58I can see... It's really clear!
0:12:58 > 0:13:02I can see it's sort of like a yellow ball with these rings going round it.
0:13:02 > 0:13:03SHE GASPS
0:13:03 > 0:13:05I can't believe it! I really can't.
0:13:05 > 0:13:08It's kind of like a yellowy colour.
0:13:09 > 0:13:11And how many moons does Saturn have?
0:13:11 > 0:13:14It has at least 60 moons, and it has the rings,
0:13:14 > 0:13:19which are made of billions of tiny, tiny icy moons, all orbiting round the planet.
0:13:19 > 0:13:21They're made of billions of bits of ice,
0:13:21 > 0:13:24up to the size of a car, down to the size of a tiny pebble.
0:13:24 > 0:13:29- They're all independently orbiting around Saturn, like billions of tiny moons.- I can't...
0:13:29 > 0:13:31It's a pretty incredible sight.
0:13:31 > 0:13:34It really is. I mean, it just... Wow!
0:13:34 > 0:13:36OK, so I've got one last thing to show you.
0:13:36 > 0:13:41Behind me, you can see the meridian line in the form of a laser.
0:13:41 > 0:13:43Now, I've been told on a good night
0:13:43 > 0:13:45it can stretch for up to 70 kilometres
0:13:45 > 0:13:48and it runs right through London and into Essex.
0:13:48 > 0:13:51So that brings me to the end of our visit to the observatory.
0:13:51 > 0:13:55I think it's fair to say that my brain is ready to explode.
0:13:55 > 0:13:56It's completely mind-blowing.
0:13:56 > 0:14:00You know, probability suggests there could be life on other planets,
0:14:00 > 0:14:02and potentially, in the future,
0:14:02 > 0:14:05time travel could actually be possible.
0:14:05 > 0:14:07I find it so fascinating.
0:14:07 > 0:14:12I guess I've got an invested interest in it, because I've been working on Doctor Who.
0:14:12 > 0:14:18But this visit has given me a tiny glimpse into the life of Amy Pond.
0:14:18 > 0:14:20Thanks for joining me.
0:14:20 > 0:14:22# Everybody's starry eyed... #
0:14:28 > 0:14:31Subtitles by Red Bee Media Ltd
0:14:31 > 0:14:33E-mail subtitling@bbc.co.uk