0:00:02 > 0:00:04BOING!
0:00:04 > 0:00:05Whoa!
0:00:05 > 0:00:09# If you've got a question And you don't know where to go
0:00:09 > 0:00:11# Ask Nina for help She's got a science show
0:00:11 > 0:00:15# She makes sense of her senses While helping all her fans
0:00:15 > 0:00:18# Doing her experiments With potions and bangs... #
0:00:18 > 0:00:21- Touch your tongue. - Tongue!- Fingers.- Fingers!
0:00:21 > 0:00:23- Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:23 > 0:00:26# Nina and the Neurons Find out what you need
0:00:26 > 0:00:29# Nina and the Neurons Find out what you need
0:00:29 > 0:00:32# Luke, he helps us with our eyes and Felix with our touch
0:00:32 > 0:00:35# Ollie sniffs out smells Belle hears so much
0:00:35 > 0:00:38# Bud is Ollie's brother Helps us with our taste
0:00:38 > 0:00:42# They're Nina's little Neurons Coming to your place! #
0:00:42 > 0:00:45- Touch your tongue.- Tongue! - Fingers!- Fingers!
0:00:45 > 0:00:48- Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:48 > 0:00:51# Nina and the Neurons Find out what you need
0:00:51 > 0:00:53# Nina and the Neurons Find out what you need
0:00:53 > 0:00:55# Oh, yeah! #
0:00:58 > 0:01:01Wooo!
0:01:01 > 0:01:03Hello, I'm playing with my new toy.
0:01:03 > 0:01:05It's very clever(!)
0:01:05 > 0:01:07It can be small like this.
0:01:07 > 0:01:08Or big like this!
0:01:08 > 0:01:10Ha-ha-ha!
0:01:10 > 0:01:11Woo, whoop!
0:01:11 > 0:01:14But it always stays the same round shape.
0:01:14 > 0:01:15Hee-hee.
0:01:15 > 0:01:17DOOT DOOT
0:01:17 > 0:01:20I see a flash, I wonder what they're going to ask.
0:01:25 > 0:01:29- Hi, Nina.- Hi.
0:01:29 > 0:01:32We've got a question for you.
0:01:32 > 0:01:34How do we know the Earth is round?
0:01:34 > 0:01:38That's a great question. How do we know the Earth is round?
0:01:38 > 0:01:42Why don't you come down to my workshop and we'll investigate?
0:01:42 > 0:01:44ALL: See you soon, Nina! Bye!
0:01:46 > 0:01:47Bye.
0:01:47 > 0:01:50I'm going to need some help to answer this one
0:01:50 > 0:01:54and I know just who to ask. OK, Neurons, time to get to work.
0:02:08 > 0:02:11ALL: Neurons at the ready, Nina.
0:02:11 > 0:02:15Today's question is how do we know the Earth is round?
0:02:15 > 0:02:17Which Neuron do you think would be most useful
0:02:17 > 0:02:19in helping us find the answer?
0:02:19 > 0:02:21ALL: Me! Me! Me!
0:02:22 > 0:02:24Will it be...Fabulous Felix?
0:02:24 > 0:02:28I can help so very much if you need the sense of touch.
0:02:28 > 0:02:30Will it be...Beautiful Belle?
0:02:30 > 0:02:32I send messages to brain from ear,
0:02:32 > 0:02:35if there's a sound I'll help you here.
0:02:35 > 0:02:37Will it be...Lovely Luke?
0:02:37 > 0:02:39For looking and seeing, day or night,
0:02:39 > 0:02:41I'll help you with your sense of sight.
0:02:41 > 0:02:43Will it be...Awesome Ollie?
0:02:43 > 0:02:45If it's pongy or whiffy,
0:02:45 > 0:02:48but you can't tell, my messages help your sense of smell.
0:02:48 > 0:02:50Or will it be Baby Bud?
0:02:50 > 0:02:55Sour, salty, bitter, or sweet, I'm your taste buddy whenever you eat.
0:03:00 > 0:03:03- It's Luke. - CHEERING
0:03:03 > 0:03:04- ALL:- Go, Luke.
0:03:04 > 0:03:06Go, Luke!
0:03:06 > 0:03:09Go, Luke!
0:03:09 > 0:03:11Cool, Nina.
0:03:11 > 0:03:13I'll be looking out to help you!
0:03:13 > 0:03:17Today's question is how do we know the Earth is round?
0:03:17 > 0:03:20Because we can see a round shape, Luke will be helping us today,
0:03:20 > 0:03:24but stand by, Neurons, I may need help from all of you.
0:03:24 > 0:03:28I need to get the workshop ready before the Explorers arrive.
0:03:29 > 0:03:33Charlie loves his bike, Katie loves holidays
0:03:33 > 0:03:34and Zak likes Taekwondo,
0:03:34 > 0:03:38but they all want to know, how do we know the Earth is round?
0:03:38 > 0:03:41There's a round model Earth at school.
0:03:41 > 0:03:43But outside the ground looks flat.
0:03:43 > 0:03:46How do we know the Earth is round?
0:03:48 > 0:03:50So, today, for one day only,
0:03:50 > 0:03:53Charlie, Katie and Zak become the Explorers.
0:03:59 > 0:04:01Hi, guys.
0:04:01 > 0:04:02ALL: Hi, Nina.
0:04:02 > 0:04:05Welcome and thank you for your great question -
0:04:05 > 0:04:07how do we know the Earth is round?
0:04:07 > 0:04:12To find out the answer, let's start by using our senses.
0:04:12 > 0:04:14ALL: Woot-woo, a senses experiment.
0:04:14 > 0:04:16We're ready, Nina.
0:04:16 > 0:04:18We live on a big planet called Earth,
0:04:18 > 0:04:20which looks like this.
0:04:20 > 0:04:23The blue parts are water.
0:04:23 > 0:04:26Which are the seas and the oceans
0:04:26 > 0:04:27and the greeny parts?
0:04:27 > 0:04:29Well, they're land.
0:04:29 > 0:04:32- Now, what shape is this?- Round!
0:04:32 > 0:04:35Yes, and the real Earth is round too!
0:04:35 > 0:04:37Why does the ground look flat?
0:04:37 > 0:04:40Well, let's play a ball game to find out.
0:04:40 > 0:04:43Yippee! A ball game! My favourite!
0:04:43 > 0:04:45Here is a really small ball,
0:04:45 > 0:04:49so let's see what it looks like close up using the Nina Cam.
0:04:50 > 0:04:52Oh.
0:04:52 > 0:04:54Now, does it look curved or flat?
0:04:54 > 0:04:55Curved.
0:04:55 > 0:04:58The small ball is really curved, but planet Earth,
0:04:58 > 0:05:02where we live, is much bigger than this, isn't it?
0:05:02 > 0:05:05So I think we should try a bigger ball.
0:05:05 > 0:05:07Woot-woo.
0:05:08 > 0:05:09Ha-ha-ha!
0:05:09 > 0:05:13Now let's see what this big ball looks like closer up.
0:05:13 > 0:05:15Ooh.
0:05:15 > 0:05:19Now, does it look more curved or more flat than a small ball?
0:05:19 > 0:05:21More flat.
0:05:21 > 0:05:24Yes, the bigger ball is less curved than the small ball,
0:05:24 > 0:05:26so it looks flatter.
0:05:26 > 0:05:28But Earth is much bigger than this ball too.
0:05:28 > 0:05:30So, hold on a minute.
0:05:31 > 0:05:33Whoa. Whoa.
0:05:33 > 0:05:35Whoa, ho-ho. Ha-ha!
0:05:35 > 0:05:37Come on.
0:05:41 > 0:05:43Ho-ho, I think this is a bit bigger.
0:05:43 > 0:05:45LUKE: Whoa, ho-ho, that is a huge ball!
0:05:45 > 0:05:48Imagine playing football with that.
0:05:48 > 0:05:52So, let's see what this really, REALLY big ball looks like up close.
0:05:54 > 0:05:56Whoa.
0:05:56 > 0:05:59Now, does it look more curved or flat?
0:06:00 > 0:06:03- Flat.- Yes.
0:06:03 > 0:06:08As the balls got bigger and bigger, the top looked flatter and flatter
0:06:08 > 0:06:10and that's what happens on the real Earth.
0:06:10 > 0:06:13The real Earth is much, much bigger than this ball.
0:06:13 > 0:06:17It's so big, the ground looks flat to us.
0:06:17 > 0:06:21But, really, it's gently curving, like the top of a gigantic ball.
0:06:21 > 0:06:24But how do we know the Earth is round, Nina?
0:06:24 > 0:06:27We need to see the Earth from a bit higher up to find out.
0:06:32 > 0:06:33LUKE: Here we go!
0:06:33 > 0:06:36I can't wait to see where we'll end up today.
0:06:36 > 0:06:38- OLLIE:- Nina said we have to see the Earth
0:06:38 > 0:06:40from somewhere a bit higher up.
0:06:40 > 0:06:43Oh, maybe we're going on a rollercoaster!
0:06:43 > 0:06:45That's really high up!
0:06:45 > 0:06:47And really noisy.
0:06:47 > 0:06:49Whee!
0:06:49 > 0:06:52Well, we're about to find out, Neurons, we're here.
0:06:52 > 0:06:55So, in order to help answer your question -
0:06:55 > 0:06:57how do we know the Earth is round -
0:06:57 > 0:07:01we need to see the Earth from somewhere a bit higher.
0:07:01 > 0:07:02The sky.
0:07:02 > 0:07:04Ah, yeah!
0:07:04 > 0:07:08OK, so far we've found out that we live on a planet called Earth
0:07:08 > 0:07:12that is round. But cos it's so big, the ground looks flat,
0:07:12 > 0:07:15when actually it's a gentle curve.
0:07:15 > 0:07:18So how can we see what shape the Earth is?
0:07:18 > 0:07:23Well, maybe my little astronaut friend will be able to explain.
0:07:23 > 0:07:24Ha-ha, say hello.
0:07:24 > 0:07:27ALL: Hello, Mr Astronaut.
0:07:27 > 0:07:30- OLLIE:- Oh, Mr Astronaut, so cute.
0:07:30 > 0:07:33Now, when we're standing on the Earth, like we are now,
0:07:33 > 0:07:35we can't see the shape of it.
0:07:35 > 0:07:39But if we were to go very, very high up into the sky -
0:07:39 > 0:07:41way up above the clouds -
0:07:41 > 0:07:43we would be able to see what shape the Earth is.
0:07:43 > 0:07:46So we're going to do an experiment to see
0:07:46 > 0:07:50what the Earth looks like from very, very high up.
0:07:50 > 0:07:54FELIX: Ooh, I'm not sure going up that high is very wise, Nina.
0:07:54 > 0:07:56No, we're not going high up, Felix,
0:07:56 > 0:07:59something else is going to do that for us -
0:07:59 > 0:08:01a giant balloon.
0:08:03 > 0:08:06This is a very special balloon that can go really high.
0:08:06 > 0:08:08We have permission to do this
0:08:08 > 0:08:12and we've got experts helping us, so you can't do this at home.
0:08:12 > 0:08:14Can you see underneath the balloon here,
0:08:14 > 0:08:17there's a box with some tiny cameras in it
0:08:17 > 0:08:19and these cameras are going to record
0:08:19 > 0:08:23what shape the Earth is from way up high so that we can see it.
0:08:23 > 0:08:26But I think this balloon needs a captain.
0:08:26 > 0:08:30How about we send Mr Astronaut in his space rocket up there too?
0:08:30 > 0:08:32ALL: Yeah!
0:08:32 > 0:08:34Mr Astronaut will be able to see
0:08:34 > 0:08:37what the Earth looks like from very high up.
0:08:37 > 0:08:40Oh, I've always wanted to see the world.
0:08:40 > 0:08:42Are we ready to launch?
0:08:42 > 0:08:43ALL: Yeah!
0:08:43 > 0:08:45Let's count down.
0:08:45 > 0:08:47Five, four, three,
0:08:47 > 0:08:50two, one, blast-off!
0:08:56 > 0:08:58NEURONS: Bye, Mr Astronaut!
0:08:58 > 0:09:02Hooray, our balloon and Mr Astronaut are on their way
0:09:02 > 0:09:05and soon they'll be very, very high up in the sky.
0:09:05 > 0:09:08I can't wait to see what the camera records,
0:09:08 > 0:09:10so thank you so much for helping us.
0:09:10 > 0:09:13Will the balloon ever come back down again?
0:09:13 > 0:09:16We'll have to wait a while to find out.
0:09:18 > 0:09:20You asked how do we know the Earth is round
0:09:20 > 0:09:24and so far we've found out that we live on a planet called Earth,
0:09:24 > 0:09:28which is round. It's so big that the ground looks flat,
0:09:28 > 0:09:30but really it's a gentle curve.
0:09:30 > 0:09:32And we also found out that if we were to go
0:09:32 > 0:09:36very, very high up into the sky, we could see the shape of the Earth
0:09:36 > 0:09:39and there are special balloons to do it for us.
0:09:39 > 0:09:42So I wonder how our balloon got on.
0:09:42 > 0:09:44Well, does anyone recognise this?
0:09:44 > 0:09:46It's Mr Astronaut.
0:09:46 > 0:09:51Yes! So the balloon did eventually come down, but a long way from here.
0:09:51 > 0:09:54So Mr Astronaut's had a bit of an adventure, haven't you?
0:09:54 > 0:09:57Let's have a look at what the camera recorded
0:09:57 > 0:09:59and see what shape the Earth is.
0:10:02 > 0:10:04That's when we launched the balloon.
0:10:05 > 0:10:09Mr Astronaut's getting lifted very high up into the sky.
0:10:12 > 0:10:15Oh, he's really, really, really high now.
0:10:15 > 0:10:18LUKE: Whoa, look at the astronaut,
0:10:18 > 0:10:20he's on top of the world.
0:10:20 > 0:10:22So, this is what the camera recorded.
0:10:22 > 0:10:25So what shape is the Earth?
0:10:25 > 0:10:27Round.
0:10:27 > 0:10:29Exactly, because our camera was so high up,
0:10:29 > 0:10:31we can see that the Earth is round
0:10:31 > 0:10:35and I've got another fun way to show that the Earth is round.
0:10:35 > 0:10:36Let's play a game.
0:10:38 > 0:10:41So, here is a big globe of the Earth
0:10:41 > 0:10:43and we're going to do a bit of travelling.
0:10:43 > 0:10:47We're starting here and we want to go...over there.
0:10:47 > 0:10:50So, shall we take the plane?
0:10:50 > 0:10:52Yeah, are we ready to take off?
0:10:52 > 0:10:53Go.
0:10:56 > 0:10:59And we're here. Well, that was a very short flight.
0:10:59 > 0:11:03I'd like to see more of the world, let's take the train next.
0:11:03 > 0:11:06Let's see some train choo-choo arms. Choo-choo!
0:11:06 > 0:11:08ALL: Choo-choo!
0:11:08 > 0:11:09Choo-choo!
0:11:09 > 0:11:11Choo-choo, choo-choo!
0:11:11 > 0:11:13I love train sounds.
0:11:14 > 0:11:16Choo-choo, choo-choo.
0:11:16 > 0:11:18Oh, we've gone halfway round the world.
0:11:18 > 0:11:22But we've come to a bit of sea, we need to take the boat.
0:11:22 > 0:11:26Need to paddle. That's it, let me see your paddling arms everyone.
0:11:26 > 0:11:28All the way round, keep going.
0:11:28 > 0:11:31Paddling in the boat and we've come to dry land,
0:11:31 > 0:11:35let's drive the rest of the way. Seat belts on, everyone.
0:11:35 > 0:11:36Steering wheels ready.
0:11:38 > 0:11:41ALL: Brrrm!
0:11:41 > 0:11:43Well, that was fast.
0:11:43 > 0:11:45They're back already.
0:11:46 > 0:11:49Hey, that was a brilliant trip. Well, where are we now?
0:11:49 > 0:11:51Back where we started.
0:11:51 > 0:11:54Yes, we've gone right round the world.
0:11:54 > 0:11:56We went forward the whole time
0:11:56 > 0:11:58and we've ended up back where we started.
0:11:58 > 0:12:01Explorers did that many years ago
0:12:01 > 0:12:04and that's how we found out the Earth is round.
0:12:04 > 0:12:06# Nina and the Neurons! #
0:12:09 > 0:12:12Your question was how do we know the Earth is round
0:12:12 > 0:12:14and I think we've answered it.
0:12:14 > 0:12:17OLLIE: We live on a big planet called the Earth that is round.
0:12:17 > 0:12:20- LUKE:- Because the Earth is so big, it looks flat.
0:12:20 > 0:12:23- FELIX:- But really it is a very gentle curve.
0:12:23 > 0:12:27BELLE: Special cameras can go very, very high up in the sky,
0:12:27 > 0:12:30and record what shape the Earth is.
0:12:30 > 0:12:32- BUD: - And we can see that it's round!
0:12:32 > 0:12:35So, I hope that's answered your question.
0:12:35 > 0:12:37ALL: Thanks, Nina, bye.
0:12:37 > 0:12:39You're welcome, bye.
0:12:42 > 0:12:46If you want to know more about the science all around us,
0:12:46 > 0:12:50go to the Nina section on the CBeebies website. Have fun.
0:12:50 > 0:12:54# Every day the sun comes up It brightens up the sky
0:12:54 > 0:12:58# A brand-new day to understand
0:12:58 > 0:13:01- # A chance to ask ourselves why - Why?
0:13:01 > 0:13:06# There's a world of possibilities outside our front door
0:13:06 > 0:13:07# Front door
0:13:07 > 0:13:12# So every day take a look around and explore
0:13:12 > 0:13:15# Explore, explore, explore, explore
0:13:15 > 0:13:18- # Exploring in the garden - Grass
0:13:18 > 0:13:21- # Exploring in the park - Rivers
0:13:21 > 0:13:24- # Exploring in the daytime - Mountains
0:13:24 > 0:13:27- # And even when it's dark - Planets
0:13:27 > 0:13:31# Look at the Earth, look at the sky Look at the world before us
0:13:31 > 0:13:35# Explore, explore, explore, explore
0:13:35 > 0:13:37# We're always on the lookout
0:13:37 > 0:13:41- # We're Earth explorers - O-oh, o-oh
0:13:41 > 0:13:44- # We're Earth explorers - O-oh, o-oh
0:13:44 > 0:13:46# We're Earth explorers. #
0:13:47 > 0:13:50Exploring is about looking at the world around us,
0:13:50 > 0:13:53asking why and finding out the answer.
0:13:53 > 0:13:57Whether it's deep underground, at the end of your playground
0:13:57 > 0:14:01or way above the clouds, keep exploring our exciting world.
0:14:01 > 0:14:03See you again soon. Bye.
0:14:03 > 0:14:05ALL: Bye.
0:14:05 > 0:14:08Subtitles by Red Bee Media Ltd