Seeing Stars: Crash Course Kids #20.1 *corrected* - Free Educational videos for Students in K-12

Seeing Stars: Crash Course Kids #20.1 corrected - By Crash Course Kids

Transcript


00:09	what makes a star is it the right hairdo ?
00:12	A funny twitter account , cool clothes , famous friends
00:15	. Well if you're into science like I am then
00:17	the stars you should care about aren't the ones in
00:18	movies or on tv . They're the ones in space
00:22	but with so many shiny objects floating around up there
00:24	it can be hard to tell what's a star and
00:26	what's not . So let me introduce you to some
00:29	real stars . A star is a bright object in
00:36	space that gives off light through energy that it makes
00:39	in its core . No mm something really bright that
00:43	gives off a lot of light and it creates energy
00:46	in its core . That sounds familiar and if it
00:48	doesn't it should I'm thinking of the sun . We
00:52	already learned that the sun is a star like the
00:54	sun . All stars are giant balls of gas located
00:57	millions of kilometers away from us . Obviously the sun
01:00	isn't the only star in our universe , it's just
01:02	the most famous one . At least to us ,
01:04	astronomers think that there are billions of stars out there
01:07	. But does that mean all the sparkly things you
01:09	see when you look up at the night sky are
01:11	stars , nope . There are all kinds of things
01:14	in space that glow or appear to glow just like
01:17	stars do , but they're not actually stars . Let's
01:21	check out three kinds of things in space that can
01:23	sometimes get mistaken for a star . First up planets
01:27	, planets are big round objects in space that travel
01:29	around the star , you know , or really should
01:32	know that you live on a planet . Earth .
01:35	There are seven other planets in our solar system .
01:37	Mercury , venus , mars , jupiter , Saturn ,
01:40	uranus and Neptune . All of these planets travel around
01:44	the same star , the sun . These eight planets
01:46	aren't the only planets in our solar system though .
01:49	There are several other planets up there too . But
01:51	because of their smaller size , scientists call them dwarf
01:54	planets , dwarf planets are a lot like regular planets
01:57	, their roundish and also traveling a path around the
01:59	sun . But unlike regular planets , dwarf planets are
02:03	smaller and they might be in for a bumpy ride
02:05	. While regular planets have a clear path around the
02:07	sun , dwarf planets , paths are full of other
02:10	stuff like asteroids , more on those in just a
02:12	minute . So how can you tell planets and dwarf
02:14	planets apart from stars ? I mean it's pretty easy
02:17	to mix them all up from a big distance ,
02:18	but if you zoom in really close planets and stars
02:21	are pretty different , most planets appear brighter to us
02:24	than stars do . This is because the planets we
02:26	see are closer to Earth and the stars are .
02:28	Another big difference is whether they appear to move in
02:31	relation to the other things in the sky around them
02:33	. Like I said , the planet's orbit or follow
02:35	a path around the sun . So imagine that you
02:37	observe the certain planet by taking photos of it in
02:40	the sky every night for many months . And then
02:42	you compared all of those photos , you'd be able
02:44	to track the planet's movement and see that its position
02:47	in the sky changed in relation to the stuff around
02:50	it . Stars change their position in our night sky
02:52	too , but they're located much further away , so
02:54	it's harder to track their movement . Plus when stars
02:57	move because they're all so far away , they appear
03:00	to all move together . So if you're tracking one
03:03	star as it changes its position in the night sky
03:05	, the stars around it move with it . Another
03:08	thing to look out for colour . If an object
03:10	in space has an intense color , it's most likely
03:13	a planet , not a star . So besides planets
03:16	and dwarf planets , what's the third object in space
03:18	? That could be mistaken for a star ? Asteroids
03:21	? Asteroids are chunks of rock and metal that also
03:24	orbit around the sun . Most asteroids are found in
03:26	the asteroid belt , an area between mars and jupiter
03:29	. So what does an asteroid look like to a
03:31	passing spacecraft , it just looks like a giant rock
03:34	. But from a spot very far away , like
03:37	earth , asteroids can look like tiny spots of light
03:40	. So how do you tell the difference between an
03:42	asteroid and the star ? Sort of how you tell
03:44	the difference between a planet and a star like planets
03:47	. Asteroids are closer to Earth and stars and are
03:49	easier to track across the night sky over time .
03:51	Also , stars tend to twinkle when viewed from earth
03:54	or blink on and off , going from bright to
03:56	faint planets and asteroids generally don't twinkle . Now let's
04:00	take some of what we've just learned and see if
04:02	we can spot the real stars among the impostors .
04:05	Mhm . It's time to play star or not .
04:11	A star . Here's how it works . We look
04:13	at an image of something in space and I'll give
04:15	you some clues . Then you'll guess whether the object
04:18	is a star or not . Here we go ,
04:20	introducing object number one star or not , a star
04:24	. Let's take a look at the evidence . Your
04:26	first clue is brightness . Most stars aren't as bright
04:29	as this object , meaning it's probably pretty close to
04:32	Earth . Now let's watch the object for a couple
04:35	of months . Just kidding . I'll just tell you
04:38	that after watching this object for a very long time
04:41	, you'd be able to tell it's moving through different
04:43	parts of the sky , night after night , while
04:46	most of the stuff around it doesn't seem to be
04:48	moving at the same rate . So star or not
04:51	a star , if you say that this is not
04:53	a star than congrats , you're a genius or you
04:57	know , you've been paying attention . The object is
04:59	one of our planet neighbors venus . Since it's a
05:02	planet , it's much closer to Earth than the stars
05:04	and therefore appears to be brighter and since it's a
05:07	planet , it's moving around a star in this case
05:10	the sun , okay , object number two star or
05:13	not a star . This object isn't as bright is
05:16	it ? If you were to watch it for a
05:17	very long time , it might appear to move ,
05:19	but it would still be surrounded by the same stuff
05:22	you saw around it . When you first started observing
05:24	it , it would also twinkle or look like it
05:26	was blinking every so often . So . Star or
05:30	not . A star star , yep , this pretty
05:32	thing is a star called in if one of the
05:35	brighter stars in the night sky and part of the
05:37	constellation or group of stars called Pegasus , there's really
05:40	no easy way to tell from Earth if a shiny
05:42	object is a star or something else . But if
05:45	you're willing to get out your telescope and be super
05:47	patient , you can make an educated guess by looking
05:50	at the objects brightness if it twinkles or not and
05:53	if it appears to move in relation to stuff around
05:55	it in the night sky , so to sum up
06:02	a star is a bright object in space . But
06:05	now you know that just because something in the night
06:07	sky is shiny , that doesn't automatically mean it's a
06:09	star . Real stars make their own light , unlike
06:13	planets and asteroids , which just reflect light from other
06:16	objects . So the real stars in the sky are
06:18	the stars I care most about . They're all superstars
06:21	. If you ask me

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