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doit_the_clown doit_the_clown
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7 years ago
Helium nuclear reactions take place in a shell around the core of a low-mass star during its
A)   horizontal-branch phase.   C)   main-sequence phase.
B)   first red-giant phase.   D)   asymptotic giant-branch phase.
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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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doit_the_clown Author
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7 years ago
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Brilliant ツ
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