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Question: 1 communications with spacecraft nasa uses radio waves which travel...

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(1) Communications with spacecraft. NASA uses radio waves (which travel at the speed of light) to communicate with its robotic satellites. How long does it take a message to travel from Earth to a spacecraft at: (a) Mars when it is closest to Earth (about 56 million km)? (b) Mars when it is farthest from Earth (about 400 million km)? (c) Pluto at its average distance from Earth (about 5.9 billion km)? (d) Make a neatly drawn figure that shows where each of these planets is located for [60 points total] cases (a), (b) and (c) in the question. Use circles (but not to scale) for the orbits and label distances of 1 AU for Earth, 1.5 AU for Mars, and 40 AU for Pluto.

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