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doit_the_clown doit_the_clown
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7 years ago
An astronomer, examining two photographs of a small area of sky taken 20 years apart, notices that some of the stars have moved slightly across the sky, relative to most of the other stars in the photographs. This displacement of the stars across the sky is an example of
   A)  proper motion.    B)  Doppler shift.    C)  precession.    D)  radial velocity.
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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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