Life on Other Planets: Crash Course Kids #45.1 - By Crash Course Kids
Transcript
| 00:09 | Earth by now , you guys really know your way | |
| 00:12 | around this place . I mean I get that you | |
| 00:14 | knew a lot about Earth before we started all this | |
| 00:17 | . But now you know how things really work around | |
| 00:20 | here and how things work on our planet has a | |
| 00:22 | lot to do with why Earth is so special ? | |
| 00:24 | What makes it special you well not just you . | |
| 00:28 | I mean I'm sure you're special and everything , but | |
| 00:30 | what I mean is us , life , giraffes and | |
| 00:33 | sea slugs and banana trees . Things with the ability | |
| 00:35 | to grow , reproduce , react and change as far | |
| 00:39 | as we know , Earth is the only planet that | |
| 00:41 | has life . But that's only as far as we | |
| 00:43 | know . What about all the stuff that we don't | |
| 00:46 | know remember when we talked about the vast , my | |
| 00:48 | boggling headache inducing size of the universe . Yeah , | |
| 00:52 | it's big . There's a lot we don't know . | |
| 00:55 | And at the top of the list of things we | |
| 00:57 | don't know is the question , are we alone ? | |
| 01:00 | Is Earth really so special in the universe , or | |
| 01:02 | in a galaxy far , far away ? Could there | |
| 01:04 | be life forms , looking up into the sky , | |
| 01:06 | wondering the exact same thing ? That's a big question | |
| 01:09 | . Before we try to tackle it , we should | |
| 01:11 | lay out what life needs here by examining the recipe | |
| 01:13 | for life on earth will be better able to look | |
| 01:16 | for life among the stars . So what does life | |
| 01:19 | need , first of all , a star ? If | |
| 01:25 | we weren't circling the sun , you and I wouldn't | |
| 01:27 | be here for a couple of reasons . The sun | |
| 01:29 | provides energy . It's the basis of all the world's | |
| 01:31 | food chains . It's the fuel that drives almost all | |
| 01:33 | living things . The sun also provides warmth , which | |
| 01:36 | allows water to exist in liquid form . Earth's orbit | |
| 01:39 | around the sun is in kind of a sweet spot | |
| 01:41 | . It's not so cold that all the water is | |
| 01:43 | frozen and it's not so hot that all the water | |
| 01:45 | turns to vapor . What's the other thing that life | |
| 01:48 | needs food ? Living things need food for the energy | |
| 01:52 | that we get from it . And again it all | |
| 01:54 | starts with the sun . Plants take energy from the | |
| 01:56 | sun and turn it into chemical energy , which can | |
| 01:59 | then be transferred to all of the animals that eat | |
| 02:01 | those plants or other animals . So if life on | |
| 02:04 | earth needs food , water and warmth to survive , | |
| 02:07 | then what might alien life be like ? Well , | |
| 02:14 | it depends just like life on earth , it would | |
| 02:16 | depend on the circumstances of the planet and the resources | |
| 02:20 | available to the living things there no water . Maybe | |
| 02:23 | animals instead rely on liquid methane instead of liquid water | |
| 02:26 | too far from a star . Maybe they get their | |
| 02:28 | energy and warmth from heat vents and the trust of | |
| 02:30 | the planet , like the heat vents at the bottom | |
| 02:32 | of our oceans . Perhaps there's a planet that's always | |
| 02:34 | covered in thick clouds close to the ground creatures that | |
| 02:37 | would have a hard time seeing one another . So | |
| 02:39 | they need another way to communicate . Perhaps these aliens | |
| 02:42 | use smells and sounds to recognize each other , and | |
| 02:45 | perhaps they have hard outer shells to keep them protected | |
| 02:48 | in case other , bigger aliens come around looking for | |
| 02:50 | a snack . No matter what these aliens look like | |
| 02:53 | , one thing's for certain , their food chains would | |
| 02:55 | seem very familiar . How so ? Well , the | |
| 02:58 | planet would still need producers to turn energy from Starlight | |
| 03:01 | into chemical energy , say some kind of alien plant | |
| 03:05 | like things in an alien planet would also have consumers | |
| 03:09 | , things that eat the producers and probably secondary consumers | |
| 03:12 | to the things that eat those first level consumers . | |
| 03:15 | And of course , this planet would need D . | |
| 03:17 | Composers without this part of the food chain waist would | |
| 03:20 | build up on the planet , making it totally unlivable | |
| 03:23 | . Not to mention really gross . All of these | |
| 03:26 | organisms would all be on the planet together , helping | |
| 03:28 | each other survive by creating complex ecosystems , entangled , | |
| 03:32 | interlocking food webs . Now , I know this all | |
| 03:38 | sounds like science fiction , but as we've talked about | |
| 03:41 | , the universe is a crazy big place , astronomers | |
| 03:44 | think that every star in the Milky Way galaxy has | |
| 03:46 | at least one planet and there are billions of stars | |
| 03:49 | in our galaxy alone . That doesn't include the whole | |
| 03:52 | rest of the mega huge universe . So astronomers think | |
| 03:55 | that life on other planets isn't just possible , It's | |
| 03:58 | likely maybe life on other planets look like dinosaurs or | |
| 04:01 | jellyfish . Maybe it's just tiny bacteria too small to | |
| 04:04 | see without a microscope . Or maybe it's all these | |
| 04:07 | things and more just like on earth , a big | |
| 04:10 | wild party of diverse , beautiful life . I for | |
| 04:14 | one can't wait to find out |
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