Refer to Example 26.1. Ashlin travels at speed 0.800c to a star 30.0 ly from Earth. (a)

Question:

Refer to Example 26.1. Ashlin travels at speed 0.800c to a star 30.0 ly from Earth.
(a) Find the distance between Earth and the star in the astronaut's frame of reference.
(b) How long (as measured by the astronaut) does it take to travel this distance at a speed of 0.800c? Compare your answer to the result of Example 26.1 and explain any discrepancy.