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doit_the_clown doit_the_clown
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7 years ago
Which two quantities are shown to be related to one another in Hubble's law?
A)   Distance and brightness
B)   Brightness and the width of the 21-cm radio emission line of hydrogen
C)   Brightness and recession velocity
D)   Distance and redshift of light from the object
Textbook 
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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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
Smart ... Thanks!
kevin12323h
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Yesterday
Good timing, thanks!
shangshang
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2 hours ago
Helped a lot
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