11. in the earth's reference frame, a star is 82 light-years away. the speed at which an astronaut would have to travel so that the distance would be 35 light-y

11. In the earth's reference frame, a star is 82 light-years away. The speed at which an astronaut would have to travel so that the distance would be 35 light-years away is A. c. B. 0.3 c. C. 0.6 c. D0.9 c.