Spaced Out: Crash Course Kids #25.1 - By Crash Course Kids
Transcript
| 00:09 | the universe is big . Really big , bigger than | |
| 00:14 | that . No , you're not thinking big enough . | |
| 00:16 | It's so massive that it makes my brain hurt . | |
| 00:19 | It's so ginormous . Wee teeny tiny humans can barely | |
| 00:24 | just barely get our brains to comprehend it . But | |
| 00:27 | just because we can't really fully understand how big the | |
| 00:31 | universe is . Doesn't mean it's not important . The | |
| 00:34 | universe is our home . We should at least poke | |
| 00:36 | around . So how big is the universe ? Let's | |
| 00:44 | start off with our cosmic address . That's where we | |
| 00:47 | live in the universe , you could say my current | |
| 00:49 | cosmic address is the crash course kids studio , Toronto | |
| 00:53 | , Canada , North America , Earth , the solar | |
| 00:55 | system , the Milky Way Galaxy , the observable universe | |
| 00:58 | . The universe . Knowing our cosmic address helps us | |
| 01:01 | understand where the things in the sky are things like | |
| 01:04 | stars , asteroids , planets , even other Galaxies . | |
| 01:07 | Every time we go up and out A level in | |
| 01:10 | our cosmic address , the actual space we're talking about | |
| 01:13 | gets more spacious distances in space are so large that | |
| 01:17 | scientists had to come up with a whole new way | |
| 01:19 | of measuring them . You can't talk about space using | |
| 01:21 | miles or kilometers . The numbers get so big that | |
| 01:24 | they just sound like nonsense . That's where a light | |
| 01:27 | year comes in . It sounds like a measure of | |
| 01:29 | time because it has the word year in it . | |
| 01:31 | But it's really a measure of distance . Light is | |
| 01:34 | the fastest thing we know in the whole universe . | |
| 01:36 | Clocking in at a whopping 300,000 kilometers per second in | |
| 01:41 | one second , light can travel around the Earth , | |
| 01:43 | the whole Earth seven times . It's moving so fast | |
| 01:47 | . Our brains can't detect that it's moving at all | |
| 01:50 | . So , a light year is the distance that | |
| 01:52 | light can travel in one year . Does your head | |
| 01:54 | hurt yet ? Well , buckle up because we're just | |
| 01:57 | getting started back to our big question , how big | |
| 02:01 | is this universe of ours ? Nobody knows . Really | |
| 02:04 | ? That's pretty weird . Right ? Well , that's | |
| 02:06 | partly because the only part of the universe we know | |
| 02:09 | about is what we call our observable universe . The | |
| 02:12 | parts that we can actually see or observe in any | |
| 02:15 | direction . Some things are so far away that light | |
| 02:18 | from those objects haven't even reached us yet . That | |
| 02:21 | is the limit of our observable universe . Beyond that | |
| 02:24 | . We don't know what's out there . But even | |
| 02:26 | sticking to the observable universe , we're going to need | |
| 02:29 | to scale things way down to understand any of it | |
| 02:33 | . Mm Let's try to visualize our cosmic address on | |
| 02:39 | a scale that we can handle . Let's use this | |
| 02:41 | room as our scale . It's about 10 m by | |
| 02:43 | 10 m the size of an average classroom . If | |
| 02:45 | the sun were the size of this room , the | |
| 02:47 | earth would be about this big . Okay , not | |
| 02:50 | too crazy . Now , imagine our whole solar system | |
| 02:54 | where the size of this room , this would be | |
| 02:56 | the sun . Don't see anything . That's because it's | |
| 02:59 | just a grain of salt . A grain of salt | |
| 03:02 | . Yeah , that's our son . And the Earth's | |
| 03:05 | orbit around the Sun would be about the size of | |
| 03:07 | this disk at this scale . The Earth is just | |
| 03:09 | a microscopic bacterium . We can't even see it at | |
| 03:13 | this size . Our whole big huge solar system is | |
| 03:17 | just a grain of salt . Now , what if | |
| 03:20 | the entire Milky Way Galaxy with the size of this | |
| 03:22 | room ? Our solar neighborhood would be this big boy | |
| 03:27 | . Now for the finale , the biggest thing we | |
| 03:29 | know the observable universe . Imagine the observable universe is | |
| 03:34 | this room ? Can you spot the Milky Way ? | |
| 03:36 | Nope , It's just way too small . It's not | |
| 03:38 | that it's just unsuitable , it's smaller than microscopic . | |
| 03:42 | The whole Milky Way . Are you dizzy ? I'm | |
| 03:44 | dizzy . So that gives you an idea of the | |
| 03:46 | size of the things in the universe . But what | |
| 03:49 | about the size of the space ? You know that | |
| 03:51 | the Sun is the closest star to the Earth ? | |
| 03:54 | But what is the second closest that would be Proxima | |
| 03:57 | centauri ? It's 4.24 light years away . That means | |
| 04:01 | it takes light from that star four years to reach | |
| 04:04 | us . By comparison . It takes the sun's like | |
| 04:07 | eight minutes to get to Earth . If you want | |
| 04:09 | to visit the sun's closest star friend traveling in the | |
| 04:11 | fastest object humans have ever built , it would still | |
| 04:15 | take 19,000 years to get there . And that's only | |
| 04:19 | 4.24 light years away . The observable universe is are | |
| 04:23 | you ready for this , 93 billion light years across | |
| 04:27 | ? Even using light years , it's so big ! | |
| 04:29 | It still sounds kind of like nonsense . Huh ? | |
| 04:36 | So space ! It's big . Really big , mind | |
| 04:40 | bogglingly big . But it's also our home , even | |
| 04:43 | if we're just unbelievably small little things floating on a | |
| 04:46 | speck of dust in a teeny tiny galaxy , we're | |
| 04:49 | still here and we know where we are in the | |
| 04:52 | universe , and that's pretty awesome . But I think | |
| 04:56 | I need to go lie down now . |
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Spaced Out: Crash Course Kids #25.1 is a free educational video by Crash Course Kids.
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