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doit_the_clown doit_the_clown
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7 years ago
Radio waves of 21-cm wavelength originate from which component of the interstellar medium?
A)   Cool, neutral atomic hydrogen   C)   Cool, carbon monoxide, CO
B)   Cold, molecular hydrogen, H2   D)   Hot, ionized atomic hydrogen
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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7 years ago
Good timing, thanks!
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Yesterday
Thanks
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2 hours ago
Helped a lot
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