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.
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
PHOTOS/VIDEOS
Stars
http://skycenter.arizona.edu/sites/sk... [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
The Sizes of Stars
http://www.eso.org/public/usa/images/... [credit: ESO/M. Kornmesser]
Fusion in the Sun
https://commons.wikimedia.org/wiki/Fi... [credit: Borb, Wikimedia Commons]
Mega Flares
http://scitechdaily.com/images/Swift-... [credit: NASA’s Goddard Space Flight Center/S. Wiessinger]
Proxima Centauri
https://www.spacetelescope.org/images... [credit: ESA/Hubble & NASA]
Physics in the Core
http://solarscience.msfc.nasa.gov/ima... [credit: NASA / Marshall Space Flight Center]
Three Years of SDO Images
http://svs.gsfc.nasa.gov/cgi-bin/deta... [credit: NASA's Goddard Space Flight Center/SDO]
Sun & Red Giants
http://kepler.nasa.gov/files/mws/kasc... [credit: NASA]
Sun as Red Giant
https://commons.wikimedia.org/wiki/Fi... [credit:Oona Räisänen, Wikimedia Commons]
Gone with the Wind
https://www.eso.org/public/usa/images... [credit: ESO]
Expanding & cooling
https://www.cfa.harvard.edu/sites/www... [credit: ESO/L. Calçada]
Looking down a barrel of gas at a doomed star
http://hubblesite.org/newscenter/arch... [credit: The Hubble Heritage Team (AURA/STScI/NASA)]
Expanding star orbit
http://www.nasa.gov/centers/goddard/i... [credit: SO/L. Calçada]
Red Giant Earth
https://commons.wikimedia.org/wiki/Fi... [credit: Fsgregs, Wikimedia Commons]
Crab Nebula
https://en.wikipedia.org/wiki/Crab_Ne... [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]
