The spaceship U.S.S.Enterprise, traveling through the galaxy, sends out a smaller explorer craft that travels to a nearby planet and signals its findings back.The proper time for the trip to the planet is measured by clocks:
A)on board the Enterprise
B)on board the explorer craft
C)on Earth
D)at the center of the galaxy
E)none of the above

Question

Quizplus · Accepted Answer

The proper time refers to the time measured by a clock that is at rest relative to the observer, in this case, the explorer craft itself.

The Spaceship U