An astronaut travels to a distant star with a speed of 0.60c relative to Earth. From the astronaut's point of view, the star is 7.0 light-years from Earth. On the return trip, the astronaut travels with a speed of 0.87c relative to Earth.What is the distance covered on the return trip, as measured by the astronaut? Give your answer in light-years.
An astronaut travels to a distant star with a speed of 0.60c relative to Earth. From the astronaut's point of view, the star is 7.0 light-years from Earth. On the return trip, the astronaut travels with a speed of 0.87c relative to Earth.What is the distance covered on the return trip, as measured by the astronaut? Give your answer in light-years.