Star Personalities: Crash Course Kids #25.2 - By Crash Course Kids
Transcript
| 00:09 | Mhm . My brain still hurts from last time . | |
| 00:12 | It's like intergalactic whiplash . You too . But there's | |
| 00:15 | a reason we zoom through the mega giant , unbelievably | |
| 00:18 | huge vastness of space . It helps us understand how | |
| 00:22 | big the universe really is , not just how big | |
| 00:24 | it appears from our perspective down here on our itty | |
| 00:27 | bitty Earth . If you glance up at the night | |
| 00:29 | sky , the stars seem like they're all on the | |
| 00:31 | same plane that is at the same distance from Earth | |
| 00:34 | and the stars all seem pretty similar . But don't | |
| 00:37 | let your eyes fool you . Some stars are relatively | |
| 00:40 | close , just four or so light years away and | |
| 00:43 | some are hundreds of thousands of light years away . | |
| 00:46 | The furthest stars are billions of light years away , | |
| 00:49 | billions people . And in the big , huge space | |
| 00:52 | penis of space , there's a lot of room for | |
| 00:55 | variety . Even in our galaxy , The Milky Way | |
| 00:57 | there's a wide range of stars so stop stereotyping them | |
| 01:01 | . Let's take a look what are the different kinds | |
| 01:03 | of stars ? Yeah , Well scientists organized stars by | |
| 01:10 | their color and size , which also happens to be | |
| 01:13 | how I organize my rock collection . We've learned that | |
| 01:15 | stars glow because they create energy through nuclear fusion . | |
| 01:18 | But not all stars produce the same amount of energy | |
| 01:22 | and stars can produce different amounts of energy throughout their | |
| 01:24 | lifetimes . I mean they're not alive , but in | |
| 01:27 | a sense , stars are born , grow up age | |
| 01:30 | and eventually die once they burned through all of the | |
| 01:32 | hydrogen in their core . And don't feel bad . | |
| 01:35 | This all happens over billions and billions of years now | |
| 01:38 | . First thing to remember , stars that produce less | |
| 01:41 | energy glow red . These stars are relatively cool with | |
| 01:44 | the surface of about 2760 degrees Celsius . But the | |
| 01:49 | very hottest stars in the universe glow blue white . | |
| 01:52 | Put on your shades because these stars can have a | |
| 01:54 | surface temperature of over 30,000 degrees Celsius . Our son | |
| 01:59 | , by the way , is a perfect Mello Yello | |
| 02:01 | temperature right in the middle with a surface temperature around | |
| 02:04 | 10,000 degrees . Stars also come in a range of | |
| 02:06 | sizes . The smallest known stars , just a little | |
| 02:09 | bit bigger than jupiter . Pretty small considering you could | |
| 02:11 | fit about 1000 jupiter's inside our son . Meanwhile , | |
| 02:14 | the largest star that we know of is many hundreds | |
| 02:17 | of times larger than the sun . If it were | |
| 02:19 | in our solar system , it would extend past Saturn's | |
| 02:21 | orbit . Once again , our son is in the | |
| 02:23 | middle of this range . We're in a real life | |
| 02:25 | goldilocks situation here . So now that we know how | |
| 02:28 | stars are classified , let's see if we can identify | |
| 02:30 | two of our star neighbors . I've got the perfect | |
| 02:32 | stars in mind a foot and an armpit . Oh | |
| 02:36 | , have you met a Ryan ? Mm . He's | |
| 02:42 | one of the most recognizable constellations and he's got two | |
| 02:45 | body parts that are made from totally different kinds of | |
| 02:47 | stars . Remember Beetlejuice ? We talked about this star | |
| 02:50 | in a previous episode , it's the right shoulder , | |
| 02:52 | some people like me call it the armpit of Orion | |
| 02:54 | and let me introduce you to reschedule Orion's left foot | |
| 02:57 | . Beetlejuice and Rachel are both in our home galaxy | |
| 02:59 | . The Milky Way , take a look at this | |
| 03:01 | picture of Orion based on the evidence that you can | |
| 03:04 | see . Which would you argue is hotter . Does | |
| 03:06 | one star look kind of reddish in another kind of | |
| 03:09 | blew you smarty pants ? I bet you already guessed | |
| 03:12 | the answer . Beetlejuice . The armpit star is a | |
| 03:14 | red supergiant , it's much , much cooler than Rydell | |
| 03:17 | and sadly it's nearing the end of its starry life | |
| 03:20 | on the other hand , or foot raj , Eliza | |
| 03:23 | , blue white supergiant star , this star is in | |
| 03:25 | the prime of its life , burning super hot and | |
| 03:28 | super bright , but stick around a few million years | |
| 03:31 | and Rachel will probably start to look like Beetlejuice , | |
| 03:34 | red and cool now since Rachel shines more brightly , | |
| 03:37 | you might assume that it's closer to us and that | |
| 03:39 | would be a great guest . But using brightness to | |
| 03:41 | judge distance can be tricky . Rydell has much greater | |
| 03:45 | true brightness or luminosity than Beetlejuice . So the foot | |
| 03:48 | outshines the armpit . So in summary a star isn't | |
| 03:56 | just a star from here on earth . The stars | |
| 03:58 | may look similar , but you know better now they | |
| 04:00 | come in different colors and different sizes . You could | |
| 04:03 | say they've got their own personality stars , they're just | |
| 04:06 | like us except millions or billions of miles away and | |
| 04:11 | gigantic . They're not really like us . |
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