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doit_the_clown doit_the_clown
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7 years ago
Variations in the output of quasars within a few hours are an indication
A)   of the rapid rotation of the sources.
B)   that these objects are actually binary systems in which we see mutual eclipses.
C)   of the relatively small size of the emitting regions.
D)   of obscuring gas and dust clouds moving in front of them from our point of view.
Textbook 
Discovering the Universe

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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hyponoticahyponotica
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7 years ago
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