Stars: Crash Course Astronomy #26

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2015-07-23に共有

Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature and most stars fall along the main sequence, where they live most of their lives.

Check out the Crash Course Astronomy solar system poster here: store.dftba.com/products/crash...

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Chapters:
Introduction: Stars 00:00
Stellar Spectra 1:07
Star Classifications 3:03
Why Are There No Green Stars? 4:00
Luminosity Depends on Size and Temperature 5:27
The HR Diagram 6:33
Main Sequence Stars 7:27
Other Stars on the HR Diagram 8:17
Review 9:50
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PBS Digital Studios: youtube.com/pbsdigitalstudios

Follow Phil on Twitter: twitter.com/badastronomer

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PHOTOS/VIDEOS
Stars www.nasa.gov/images/content/703724main_potw1244a.j… [credit: ESA/Hubble & NASA]
Spitzer Spectrum www.jpl.nasa.gov/spaceimages/details.php?id=PIA032… [credit: NASA/JPL-Caltech/Leiden/SRON]
Sun spectrum www.noao.edu/image_gallery/html/im0600.html [credit: N.A.Sharp, NOAO/NSO/Kitt Peak FTS/AURA/NSF]
Annie Jump Cannon en.wikipedia.org/wiki/Annie_Jump_Cannon#/media/Fil… [credit: New York World-Telegram and the Sun Newspaper]
Cecilia Payne-Gaposchkin en.wikipedia.org/wiki/Cecilia_Payne-Gaposchkin#/me… [credit: Smithsonian Institution]
OBAFGKM www.noao.edu/image_gallery/html/im0649.html [credit: NOAO/AURA/NSF]
Betelgeuse www.eso.org/public/usa/images/eso0927e/ [credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin]
Sirius www.nasa.gov/multimedia/imagegallery/image_feature… [credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester)]
Solar AM0 spectrum with visible spectrum background commons.wikimedia.org/wiki/File:Solar_AM0_spectrum… [credit: Danmichaelo, Wikimedia Commons]
Blue sky www.pexels.com/photo/sky-sunny-clouds-cloudy-3768/ [credit: Skitter Photo]
Hawaii sunset photo [credit: Phil Plait]
Hertzsprung-Russell Diagram commons.wikimedia.org/wiki/File:ESO_-_Hertzsprung-… [credit: ESO]

コメント (21)

@58LewisK 7年前

19 years old and I've finally learned the age old question, "Why is the sky blue?" this is amazing
@turki_wz 8年前

You're a star, Phil.
@blackmesa232323 8年前

The editor did a stellar job. He is definitely the star here. I just wish it wasn't so bright.
@willemvanechelpoel3336 4年前

the diagram shows how stars die. so it's actually a dieagram?
@nicjasno 8年前

I could watch Phil talk about astronomy all day long!
@truboo4268 8年前

The intro was so freaking creepy! "Oh... I know who you are..."
@ragnkja 8年前

OBAFGKM: Only Bad Astronomers Forget Generally Known Mnemonics.
@soundslave 8年前

Annie Jump Cannon. Possibly the best name in history.
@geniusmp2001 8年前

Without a doubt, one of my favorite topics in astronomy. I can't wait to see all the remaining detail. This is basically the topic about the ultimate ancestors of all life on Earth. And Earth itself.
@TheMathMog93 8年前

These astronomy videos, are some of the videos on youtube I absolutely look the most forward to! I am getting quite a strong passion for physics and especially astronomy, and these are great to help improve and brush up some of my knowledge on the subjects! Keep it up!
@alfredomarquez1916 8年前

So she was named Annie Jump Cannon? Are we sure she wasn't also a superhero?
@lsaldana7 4年前

Anyone watching this during the 2020 lockdown?
@shiminshamim8359 8年前

This is seriously my favorite topic in astronomy. And I'm so glad you are making whole series on astronomy. I'm gonna watch it even when I'm on my death bed :) and my friends and family are going to tease me and call me geek/nerd.
@K1z0ku 8年前

As a non-native english speaker, I had no idea Betelgeuse is pronounced "Beetle-juice" in english. In my language(Russian) it's pronounced "Betel-gay-ze""
@Codiliabra 7年前

I keep coming back to this video! I just adore stars.
@skyrimmiryks 8年前

I love those Kerbals on his table XD
@theredflash1553 7年前

"There are no green stars. Look as hard as you want, and you won't find any." -Me in Super Mario Galaxy 2
@Quark_433 8年前

"On a brighter note,..." No one else catch that? No?
@chaohongyang 8年前

A funny tease about Annie: Annie jumped into a cannon and got shot up to near the sun where she discovered that the sun emits different colors than other stars cuase of spectra!
@Shortstuffjo 8年前

I'm just glad to hear there's going to be more episodes! I've been interested in astronomy for well over 10 years now and yet I've learned a bunch from this Crash Course series. Keep making them and make them long!!