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Which two quantities are shown to be related to one another in Hubble's law?

doit_the_clown

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Which two quantities are shown to be related to one another in Hubble's law?

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: 7^th

Authors: Kaufmann, Comins

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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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