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doit_the_clown doit_the_clown
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7 years ago
The apparent reddening of light from stars after its passage through the interstellar medium (ISM) is caused by
A)   the additional contribution to this starlight by emission from hydrogen gas in the ISM.
B)   preferential scattering of blue starlight by fine dust grains.
C)   Zeeman shift of the light by the powerful magnetic fields existing within the ISM.
D)   scattering of this light from rapidly moving material, this light being Doppler-shifted toward the red end of the spectrum.
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Discovering the Universe

Discovering the Universe


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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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hyponoticahyponotica
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