The Event in the Life of a Star That Begins

question 27

Multiple Choice

The event in the life of a star that begins its expansion into a giant is

• A) the core reaches a temperature of ten million degrees
• B) as much as 90% of the star explodes violently
• C) almost all the hydrogen in its core that was hot enough for fusion has been turned into helium
• D) the star's internal structure reaches equilibrium for the first time in its life
• E) it reaches the stage that astronomers call the zero-age main sequence

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