Chapter 12: Protostars and their properties
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4 Terms
1
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Hydrostatic Equilibrium
Hot gas has pressure, which tries to make
the Sun expand
-Gravity pulls inward,
which tries to make
the Sun collapse
-Balance:
-hydrostatic
equilibrium”
2
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The big picture (Four main components of
a galaxy
1. Black: molecular clouds
2. Pink: emission nebulae
3. Blue: young stars
• Hot and bright, don’t live long
4. Yellow: old stars
3
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What is the role of rotation in star birth?
-Accretion disk, protostellar jet
• Planets
4
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How does nuclear fusion begin in a newborn
star?
Gas cloud condenses, heats up while compressing until hot enough for fusion to begin
Note 
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