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doit_the_clown doit_the_clown
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7 years ago
The Crab Nebula is
A)   a supernova remnant.
B)   a planetary nebula surrounding a hot star.
C)   a cool, gaseous nebula in which stars are forming.
D)   the active nucleus of a nearby spiral galaxy.
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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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discovererdiscoverer
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doit_the_clown Author
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Helped a lot
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tcat
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this is exactly what I needed
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