In order to cross the galaxy quickly, a spaceship leaves Earth
traveling at 0.9999995c. After 15 minutes a radio message is sent
from Earth to the spacecraft. (a) In the Earth-galaxy frame of
reference, how far from Earth is the spaceship when the message is
sent? (b) How much time elapses on spaceship clocks between when
the ship leaves Earth and when the message is sent? (c) How much
time elapses on Earth clocks between when the message is sent and
when it is received? (d) If the spaceship replies instantly with
another radio message, what total time elapses on Earth clocks
between when the message is sent and when the reply is
received?
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