Low Mass Stars: Crash Course Astronomy #29

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Low Mass Stars: Crash Course Astronomy #29

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.

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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

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Stars [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
The Sizes of Stars [credit: ESO/M. Kornmesser]
Fusion in the Sun [credit: Borb, Wikimedia Commons]
Mega Flares [credit: NASA’s Goddard Space Flight Center/S. Wiessinger]
Proxima Centauri [credit: ESA/Hubble & NASA]
Physics in the Core [credit: NASA / Marshall Space Flight Center]
Three Years of SDO Images [credit: NASA’s Goddard Space Flight Center/SDO]
Sun & Red Giants [credit: NASA]
Sun as Red Giant [credit:Oona Räisänen, Wikimedia Commons]
Gone with the Wind [credit: ESO]
Expanding & cooling [credit: ESO/L. Calçada]
Looking down a barrel of gas at a doomed star [credit: The Hubble Heritage Team (AURA/STScI/NASA)]
Expanding star orbit [credit: SO/L. Calçada]
Red Giant Earth [credit: Fsgregs, Wikimedia Commons]
Crab Nebula [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]

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