An astronaut wants to take a trip to a planet that is 10 light-years away from Earth, in theframe of the Earth. (Assume the distance between Earth and the Planet is constant.)a. How fast must the astronaut travel (at constant speed) to arrive at the planet 15years older? (Express the answer as a fraction of the speed of light.)b. If Earth tells the astronaut just before they leave to send a return radio signal backto Earth, how long should Earth expect to wait for the signal.

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