0:11:50 > 0:11:57.
0:12:03 > 0:12:04BELL RINGS
0:12:04 > 0:12:06- 30 seconds to air, everybody!- Wow!
0:12:06 > 0:12:09It takes 26,000 years for light to reach us
0:12:09 > 0:12:11from the centre of the Milky Way.
0:12:11 > 0:12:13Yes, but what about Professor McCork?
0:12:13 > 0:12:15Is he ever going to reach us?
0:12:15 > 0:12:18He'll make it, Colin. He always makes it.
0:12:18 > 0:12:20WHIRRING Whoa...!
0:12:20 > 0:12:21Ow!
0:12:21 > 0:12:25Oh, crumpets! The boss is going to be very angry.
0:12:25 > 0:12:26Argh!
0:12:26 > 0:12:29Oh, lads, you're not going to believe what I just saw.
0:12:29 > 0:12:32Positions, everyone, we're going live!
0:12:32 > 0:12:35This is Brain Freeze.
0:12:35 > 0:12:36With Dr Knowles...
0:12:38 > 0:12:40..Professor McCork...
0:12:40 > 0:12:44and Colin, the...floor manager.
0:12:45 > 0:12:48Stand by!
0:12:54 > 0:12:57Hello, everyone, and welcome to Brain Freeze.
0:12:57 > 0:12:58And let's reveal...
0:13:01 > 0:13:04Today we're asking, do aliens exist?
0:13:05 > 0:13:09And, luckily, I've got the answer right here on my ph...
0:13:09 > 0:13:11Hush, Professor, we're live!
0:13:11 > 0:13:14Now, the universe is a really, really, really big place.
0:13:14 > 0:13:17There are eight planets in our solar system,
0:13:17 > 0:13:21- which orbit our nearest star, the sun.- Sure, we all know that.
0:13:21 > 0:13:25The sun itself is one of 300 billion stars in our galaxy, the Milky Way.
0:13:25 > 0:13:27Whoa, that IS a lot of stars.
0:13:27 > 0:13:32And there are hundreds of billions of galaxies in the visible universe.
0:13:32 > 0:13:35Hundreds of...billions...wha...? HE SIGHS
0:13:35 > 0:13:39Actually, Professor, if you tried counting up every grain of sand
0:13:39 > 0:13:41on every beach in the entire world,
0:13:41 > 0:13:45it still wouldn't add up to the amount of stars in the universe.
0:13:45 > 0:13:46Professor? Professor!
0:13:46 > 0:13:50Ahem. Before we talk aliens, I think we need to take a break.
0:13:51 > 0:13:53- BELL RINGS - And we're clear!
0:13:53 > 0:13:57- Are you all right, McCork? - Aye, I'm grand, it's just a bump.
0:13:57 > 0:14:00Hey, do you want to see a video I took of an alien?
0:14:00 > 0:14:01Alien?!
0:14:01 > 0:14:03You've seen an alien?
0:14:03 > 0:14:05Here, take a look at this.
0:14:05 > 0:14:07# La la la, da ba ba
0:14:07 > 0:14:08# Ba ba ba, diddley-oh, hey! #
0:14:08 > 0:14:11Oh, no, no, that's not the one. Hang on.
0:14:11 > 0:14:12HE WHISTLES
0:14:12 > 0:14:14Agh, that's not the one either.
0:14:14 > 0:14:16Hang on, Colin, I'll get it. BELL RINGS
0:14:16 > 0:14:18Oh, hurry up, McCork! We could get in big trouble.
0:14:18 > 0:14:20- HEADSET WHINES - Oh! Yes, boss.
0:14:20 > 0:14:22Absolutely, yeah. Right away. And we're back!
0:14:22 > 0:14:24I must have been dreaming it all up.
0:14:24 > 0:14:26There's no such thing as aliens.
0:14:27 > 0:14:31Kelly just got in touch to ask, "But are we really alone?"
0:14:31 > 0:14:33Course we're not alone.
0:14:33 > 0:14:35Colin's over there, look.
0:14:35 > 0:14:38Huh? Ohh...
0:14:38 > 0:14:40Let's look at how alien life could exist.
0:14:40 > 0:14:43Humans survive on Earth because of a few basic ingredients. These are...
0:14:43 > 0:14:44liquid water,
0:14:44 > 0:14:47some key elements like hydrogen, oxygen and carbon,
0:14:47 > 0:14:50a source of energy, the moon's pull on the ocean tides,
0:14:50 > 0:14:54and an environment which keeps us warm and shields us from danger.
0:14:54 > 0:14:57So, what you're saying is, we're just really lucky?
0:14:57 > 0:15:01Well, possibly, but remember the scale of the universe?
0:15:01 > 0:15:04You mean the grains of sand on the beach bit?
0:15:04 > 0:15:07- Yes.- Urgh...- Everything all right, there, Professor?
0:15:07 > 0:15:09I'm fine! I'm OK. Carry on.
0:15:09 > 0:15:12Well, there's a good chance other worlds like ours exist,
0:15:12 > 0:15:15we just have no proof they actually support life... Yet.
0:15:15 > 0:15:17Yeah, but what are we going to do about it?
0:15:17 > 0:15:20Well, Professor, we've got huge telescopes like Hubble scanning
0:15:20 > 0:15:24the stars and sending us back detailed images of the universe.
0:15:24 > 0:15:26Meanwhile, the twin Voyager spacecrafts
0:15:26 > 0:15:29explore the outer reaches of our solar system and beyond.
0:15:29 > 0:15:32So, although no evidence of extraterrestrial life exists...
0:15:32 > 0:15:37- The search is definitely on. - See you next time, folks.
0:15:37 > 0:15:39And...we're...clear!
0:15:39 > 0:15:42- Great show, everybody.- Right, so. No rest for the wicked.
0:15:42 > 0:15:44I'm off out to buy a telescope.
0:15:44 > 0:15:45Good luck, lads. See you later.
0:15:45 > 0:15:48But, McCork...you forgot your phone!
0:15:48 > 0:15:50'Wahey!'
0:15:50 > 0:15:51Come on, faster, faster!
0:15:51 > 0:15:55This is way better than my car at home. Can't do anything like this.
0:15:55 > 0:15:57- 'Faster, faster!'- Dr Knowles...
0:15:57 > 0:15:59I think there's something you should see.
0:15:59 > 0:16:00'Can I drive?'