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doit_the_clown doit_the_clown
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7 years ago
All but one of the following conditions characterize a pre–main-sequence star in its final stages.  Which one is the exception?
A)   It is fusing hydrogen into helium in its core.
B)   It is no longer contracting.
C)   The gas and dust around the pre–main-sequence star have largely dissipated.
D)   Helium burning has begun as the principal energy generating mechanism in the core.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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papachulopapachulo
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