What Determines Whether a Particular Region of an Interstellar Cloud

question 92

Multiple Choice

What determines whether a particular region of an interstellar cloud can collapse and form a star?

• A) temperature, since higher temperatures act to prevent collapse
• B) amount of gravity pulling inward compared with gas pressure pushing outward
• C) gas density (the ratio of the mass of the cloud over its volume), since density determines how gravity will act on the cloud material
• D) amount of mass in the cloud, since mass determines the strength of gravity

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