Suppose we want to send an astronaut on a round trip to visit a star that is 200 light-yearsaway and at rest with respect to the Earth. The life support systems on the spacecraft enablethe astronaut to survive at most 20 years.a) At what speed must the astronaut travel to make the round trip in 20 years of spacecrafttime? Express your final answer as a fraction of the speed of lightcb) How much time passes on Earth during the round trip? Express your final answer in years