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doit_the_clown doit_the_clown
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7 years ago
The Crab Nebula is a nearby example of what type of physical phenomenon?
A)   A planetary nebula, a shell of gas leaving an old star
B)   The remnant of a supernova explosion
C)   A spiral galaxy, a collection of 100 billion stars
D)   A gas and dust cloud, the formation region for new stars
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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discovererdiscoverer
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7 years ago
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Thank you, thank you, thank you!
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