Everything Revolves Around You: Crash Course Kids #22.1 - By Crash Course Kids
Transcript
| 00:0-1 | Hi there Sabrina here just hanging out with Mr Moon | |
| 00:02 | . If you're wondering why he looks a little green | |
| 00:04 | . It's because he's a little jealous . We've spent | |
| 00:07 | an awful lot of time talking about the son and | |
| 00:09 | what a star is and very little time on this | |
| 00:11 | guy . So cheer up Mr Moon . Today's episode | |
| 00:14 | is all about you . To be more specific . | |
| 00:26 | Today's episode is all about orbits . Lots of things | |
| 00:29 | in space are in orbit . But let's just start | |
| 00:32 | by talking about things that orbit the Earth and those | |
| 00:34 | are two things in particular artificial satellites which are made | |
| 00:37 | by people and the moon . You should remember that | |
| 00:40 | an orbit is the path that an object follows around | |
| 00:43 | another object like how the Earth travels around the sun | |
| 00:46 | the moon orbits the Earth in a similar way . | |
| 00:48 | You should also remember a little thing called gravity . | |
| 00:51 | Gravity is a force or the natural full of objects | |
| 00:53 | toward each other . It's the thing that keeps you | |
| 00:56 | on Earth . But doesn't that make you wonder why | |
| 00:58 | gravity doesn't just pull things out of their orbit ? | |
| 01:01 | I mean if gravity pulls things toward each other , | |
| 01:03 | then why don't think that orbit the Earth crash into | |
| 01:06 | the Earth . Before we can answer that question , | |
| 01:13 | We should learn a little bit more about the things | |
| 01:15 | that orbit our planet and the paths they take around | |
| 01:17 | it . Earth has only one moon . I'm sure | |
| 01:19 | you've seen it . It's covered in huge craters that | |
| 01:21 | were formed by asteroids hitting it and great plains that | |
| 01:24 | were likely shaped by the lava that once flowed on | |
| 01:26 | its surface . We think the moon formed billions of | |
| 01:28 | years ago when chunks of the Earth were blasted into | |
| 01:30 | space after a planet sized objects hidden , these pieces | |
| 01:34 | of Earth then came together to form our moon meet | |
| 01:37 | Right now it takes the moon about 27 days to | |
| 01:39 | fully orbit the Earth . The moon is not the | |
| 01:41 | only thing that orbits our planet , but it is | |
| 01:43 | Earth's only natural satellite . A satellite is just a | |
| 01:46 | body that orbits a planet , A planet like object | |
| 01:48 | or an asteroid , plenty of human made or artificial | |
| 01:51 | satellites orbit our planet . To probably the most famous | |
| 01:55 | artificial satellite is the international space station . Or isS | |
| 01:59 | . The space station is the biggest object ever flown | |
| 02:02 | in space . Lots of countries including the United States | |
| 02:05 | , Russia , Japan and Canada built this satellite where | |
| 02:08 | astronauts live and perform scientific experiments in near weightless conditions | |
| 02:12 | . The I . S . S . Even has | |
| 02:13 | a gym on it . The I . S . | |
| 02:15 | S . Moves pretty fast , completing 16 orbits around | |
| 02:18 | our planet every day . And it's not the only | |
| 02:20 | artificial satellite up there . There are thousands of different | |
| 02:23 | satellites traveling around earth . Some of them help us | |
| 02:26 | forecast whether some monitor areas of drought in some sense | |
| 02:29 | , signals to our phones and TVs . So thanks | |
| 02:32 | for the spongebob satellites . Anyway , If all of | |
| 02:35 | these things are traveling around our planet , earth's gravity | |
| 02:37 | is constantly pulling things toward it , then why isn't | |
| 02:40 | the Earth's surface full of fallen satellites or chunks of | |
| 02:43 | moon for that matter ? I think a visual would | |
| 02:45 | really help here . Let's have our moon buddy . | |
| 02:47 | Show us exactly how he stays in space . Mm | |
| 02:52 | hmm . Welcome back . Mr Moon . Two things | |
| 02:55 | determine the orbit of a satellite . Whether it's an | |
| 02:58 | artificial satellite , like the I . S . S | |
| 03:00 | . Or if it's natural like the moon . The | |
| 03:01 | first factor is the gravitational pull of the Earth , | |
| 03:04 | which pulls things towards the center of the earth . | |
| 03:06 | The second factor is the speed and direction or the | |
| 03:09 | velocity at which the object is moving . If these | |
| 03:12 | forces are balanced then the satellite remains in stable orbit | |
| 03:15 | around the Earth . This delicate balance is super important | |
| 03:18 | . Why ? Well , the balance between an object | |
| 03:20 | velocity and the Earth's gravitational pull is the cause that | |
| 03:24 | produces the effect of the object remaining in orbit . | |
| 03:27 | If the moon speed was much faster , it would | |
| 03:29 | escape the Earth's gravity and just fly off into space | |
| 03:32 | . But if the moon speed was much slower , | |
| 03:34 | the Earth's gravity would be able to pull it down | |
| 03:36 | to Earth , and the orbits of artificial satellites work | |
| 03:38 | the same way , even though they're located closer to | |
| 03:41 | the Earth and the moon . As long as they | |
| 03:42 | move fast enough , Earth's gravity won't be strong enough | |
| 03:45 | to pull those satellites down to Earth . So technically | |
| 03:52 | the Moon and other satellites are always falling towards the | |
| 03:56 | Earth , but they're also moving so fast that they | |
| 03:59 | don't hit it now . You know why things that | |
| 04:00 | orbit the Earth don't crash into the Earth . If | |
| 04:03 | the moon and all those artificial satellites maintain a certain | |
| 04:05 | velocity , not too slow and not too fast , | |
| 04:08 | they'll avoid losing their battle against our planet's gravitational pull | |
| 04:11 | . Very impressive . Mr . Moon take a bow | |
| 00:0-1 | . |
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