Question: (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

(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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