The radio signal directed to Mercury returned 12 minutes later. How far from Earth was Mercury?

We will use the formula D = c * t / 2, where c is the speed of light, equal to 3 • 10 ^ 8 m / s.
D = 3 * 10 ^ 8 * 12 * 60/2 = 1.08 * 10 ^ 11 (m).

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