According to you, an astronaut's trip from Earth to a distant planet takes 28 years. The distant planet is in the same frame of reference as the Earth, and the astronaut travels at constant velocity between the two planets.
(a) How long does the trip take, according to the astronaut, if the astronaut's speed with respect to you is 60% of the speed of light?
years
(b) What is the distance between the planets, according to you?
light-years
(c) What is the distance between the planets, according to the astronaut?
light-years