An astronaut wishes to visit the Andromeda galaxy, making a one-way trip that will take 30.0 yr in the spacecraft’s frame of reference. Assume that the galaxy is 2.00 x 106 ly away and that the astronaut’s speed is constant.
(a) How fast must he travel relative to the Earth?
(b) What will be the kinetic energy of his 1 000-metric-ton spacecraft?
(c) What is the cost of this energy if it is purchased at a typical consumer price for electric energy: $0.130/kWh?