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15 cards from this deck
Clouds of dust and gas (nebulae)
Clouds of dust and gas in galaxies
Gravitational attraction
They both increase
Hydrogen nuclei fuse to form helium nuclei
Energy
Outward fusion pressure balances inward gravity
Forming star before becoming main sequence star
Stable star fusing hydrogen into helium
Billions of years
Star becomes unstable and collapses
Massive explosion expelling star's outer layers
Extremely dense core after supernova
Massive core collapses further after supernova
Shell of gas surrounding remaining core
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