일반물리학 2 — Relativity: Problem 33

33 You wish to make a round trip from Earth in a spaceship, traveling at constant speed in a straight line for exactly 6 months (as you measure the time interval) and then returning at the same constant speed. You wish further, on your return, to find Earth as it will be exactly 2000 years in the future. (a) To eight significant figures, at what speed parameter \(\beta\) must you travel? (b) Does it matter whether you travel in a straight line on your journey?