When Does a Star Achieve Static Equilibrium

question 285

Multiple Choice

When does a star achieve static equilibrium?

• A) When it becomes a main-sequence star.
• B) When it leaves the main sequence.
• C) When it becomes a protostar.
• D) This question has different answers for stars of different masses. Massive stars never achieve equilibrium; small stars achieve hydrostatic equilibrium as soon as they reach the main sequence.

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