The Zero-Age Main Sequence Describes the Sequence of Stars in the Hertzsprung-Russell

question 122

Multiple Choice

The zero-age main sequence describes the sequence of stars in the Hertzsprung-Russell diagram that:

• A) contain no processed elements (elements heavier than hydrogen or helium).
• B) are just beginning to convert helium into carbon in their cores.
• C) have just collapsed from the interstellar medium.
• D) have just reached the main sequence.

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