Date Added: August 11, 2016
Today we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years. More massive stars like the Sun live shorter lives. They fuse hydrogen into helium, and eventually helium into carbon (and also some oxygen and neon). When this happens they expand, get brighter, and cool off, becoming red giants. They lose most of their mass, exposing their cores, and then cool off over many billions of years.
Crash Course Astronomy posters now available at DFTBA: store.dftba.com/products/crashcourse-astronomy-poster -- Table of Contents Low Mass Stars Live a Long Time 0:57 Larger Stars (Like Our Sun) Live Shorter Lives 3:10 Fueled By Fusion 3:58 How They Turn Into Red Giants 5:45 -- PBS Digital Studios: youtube.com/pbsdigitalstudios Follow Phil on Twitter: twitter.com/badastronomer Want to find Crash Course elsewhere on the internet? Facebook - www.facebook.com/YouTubeCrashCourse Twitter - www.twitter.com/TheCrashCourse Tumblr - thecrashcourse.tumblr.com Support CrashCourse on Patreon: www.patreon.com/crashcourse -- PHOTOS/VIDEOS Stars skycenter.arizona.edu/sites/skycenter.arizona.edu/files/n6522_32in.jpg [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona] The Sizes of Stars www.eso.org/public/usa/images/eso1030c/ [credit: ESO/M. Kornmesser] Fusion in the Sun commons.wikimedia.org/wiki/File:FusionintheSun.svg [credit: Borb, Wikimedia Commons] Mega Flares scitechdaily.com/images/Swift-Mission-Observes-Mega-Flares-from-a-Mini-Star.jpg [credit: NASA’s Goddard Space Flight Center/S. Wiessinger] Proxima Centauri www.spacetelescope.org/images/potw1343a/ [credit: ESA/Hubble & NASA] Physics in the Core solarscience.msfc.nasa.gov/images/cutaway.jpg [credit: NASA / Marshall Space Flight Center] Three Years of SDO Images svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11255 [credit: NASA's Goddard Space Flight Center/SDO] Sun & Red Giants kepler.nasa.gov/files/mws/kasc3.jpg [credit: NASA] Sun as Red Giant commons.wikimedia.org/wiki/File:Sun_red_giant.svg [credit:Oona Räisänen, Wikimedia Commons] Gone with the Wind www.eso.org/public/usa/images/wr124/ [credit: ESO] Expanding & cooling www.cfa.harvard.edu/sites/www.cfa.harvard.edu/files/images/pr/2009-23/1/base.jpg [credit: ESO/L. Calçada] Looking down a barrel of gas at a doomed star hubblesite.org/newscenter/archive/releases/1999/01/image/a/ [credit: The Hubble Heritage Team (AURA/STScI/NASA)] Expanding star orbit www.nasa.gov/centers/goddard/images/content/415775main_earthlike-exoplanet-full.jpg [credit: SO/L. Calçada] Red Giant Earth commons.wikimedia.org/wiki/File:Red_Giant_Earth.jpg [credit: Fsgregs, Wikimedia Commons] Crab Nebula en.wikipedia.org/wiki/Crab_Nebula#/media/File:Crab_Nebula.jpg [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)] Course Index
In this Crash Course series, marvel at the wonders of astronomy with your host for this intergalactic adventure, the Bad Astronomer himself -- Phil Plait. In just 40 short lessons, you will learn the basics of the oldest science known to humanity.
Be sure to check out links to relevant Photos in the description for each video.