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What determines whether a particular region of an interstellar cloud can collapse and form a star?
A)   Only the temperature since higher temperatures act to prevent collapse
B)   The amount of gravity pulling inward compared to gas pressure pushing outward
C)   The gas density, the ratio of the mass of the cloud over its volume, since this determines how gravity will act on the cloud material
D)   Only the amount of mass in the cloud since this determines the strength of gravity
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Discovering the Universe

Discovering the Universe


Edition: 7th
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