일반물리학 2 — Relativity: Problem 31

31 The center of our Milky Way galaxy is about 23 000 ly away. (a) To eight significant figures, at what constant speed parameter \(\beta\) would you need to travel exactly 23 000 ly (measured in the Galaxy frame) in exactly 40 y (measured in your frame)? (b) Measured in your frame and in light-years, what length of the Galaxy would pass by you during the trip?