(a) How long did it take for a message sent from Earth to reach the first astronauts...

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(a) How long did it take for a message sent from Earth to reach the first astronauts on the Moon?
(b) How long will it take for a message from Earth to reach the first astronauts who arrive on Mars; assume Mars is at its closest approach to Earth (78 x 106 km)?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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