Question: The spacecraft that have landed on Mars send their information to the Earth via radio waves. How long do these waves take to reach the

The spacecraft that have landed on Mars send their information to the Earth via radio waves. How long do these waves take to reach the Earth when
(a) Mars is at its closest to the Earth?
(b) Mars is farthest from the Earth? This time delay is important for NASA when it sends a spacecraft to Mars.

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