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doit_the_clown doit_the_clown
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The spectrum of stars in an open cluster is found to contain spectral lines from many heavy elements, these stars being known as “metal-rich.” What is the source of these heavy elements?
A)   The fusion reactions on the very hot surfaces of these stars
B)   The heavy element content of these stars is not enhanced but the hydrogen and helium content has been depleted by intense stellar winds made up preferentially of these light elements.
C)   The fusion reactions in the star cores, carried to the surface by convection
D)   The interstellar medium, which originated in explosions of stars earlier in history that had manufactured heavy elements by nuclear fusion
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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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