While passing between Earth and the Moon, a spacecraft is momentarily located on the line connecting the centers of the two bodies and is at a distance of d = 101 km from a radio antenna on the surface of Earth. The distance from the antenna to the moon is denoted by dm.  Part (a)  Recall that the speed of light is 3.0 × 108 m/s. How long, in seconds, does it take for a signal from the spacecraft to arrive at the antenna on Earth?   Part (b)  Scientists on Earth send a command to the spacecraft, which immediately sends back a receipt confirmation signal. How long, in seconds, after the scientists send the command does it take before they learn it was received?  Part (c)  Scientists bounce a laser beam off the Moon and measure the two-way travel time to be 2.42 s. How far away is the Moon in meters?

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