When Does a Star Become a Main- Sequence Star

question 119

Multiple Choice

When does a star become a main- sequence star?

• A)the instant when hydrogen fusion first begins in the star's core
• B)when the rate of hydrogen fusion in the star's core is high enough to sustain gravitational equilibrium
• C)when the protostar assembles from its parent molecular cloud
• D)when a star becomes luminous enough to emit thermal radiation
• E)when hydrogen fusion is occurring throughout the star's interior

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