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doit_the_clown doit_the_clown
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5 years ago
As an isolated star evolves, which of the following will NOT occur?

(a)   The star gains mass because of nuclear fusion reactions.
(b)   The star loses mass to space.
(c)   The chemical composition of the star changes.
Textbook 

Discovering the Universe


Edition: 7th
Authors:
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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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5 years ago
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(a)   Correct, Isolated stars do not gain mass. Fusion reactions convert lighter elements into heavier elements, but each heavier nucleus has less mass than the sum of the lighter nuclei that combined to form it. The difference in mass has been converted into energy, which ultimately is radiated from the star, so the star in fact loses mass through fusion reactions.
(b)   Incorrect. This DOES happen. Stars lose mass through stellar winds (matter flowing away from the star into space) and by radiant energy (e.g., light) flowing from the star into space.
(c)   Incorrect. This DOES happen. Nuclear fusion makes heavier elements out of light elements in the star's interior.
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