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14 cards from this deck
Cloud of dust & gas where stars begin, mainly hydrogen
Hydrogen
Forms when gravity pulls gas & dust together
H nuclei fuse into He, releasing energy
Stable phase where thermal expansion balances gravity
Billions of years
~7 billion years
Shorter due to higher fusion rates
Outer layers ejected from small-medium stars
Hot, dense core left after planetary nebula stage
Massive explosion at end of massive star's life
Dense core mostly of neutrons, forms after supernova
So dense not even light can escape
Thermal expansion from fusion
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