The moon is about  from Earth. Traveling at the speed of light,  m/s, how long does it take a laser beam to go from Earth to the Moon and back again? The same physics was responsible for the noticeable delay in communication signals between lunar astronauts and controllers at the Houston Space Flight Center.

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter39: Relativity
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The moon is about  from Earth. Traveling at the speed of light,  m/s, how long does it take a laser beam to go from Earth to the Moon and back again? The same physics was responsible for the noticeable delay in communication signals between lunar astronauts and controllers at the Houston Space Flight Center.

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