You and a friend share the same spacetime when there is no
A)relative velocity between you.
B)acceleration for either of you.
C)difference in your rate of heartbeats.

Question

Quizplus · Accepted Answer

Sharing the same spacetime means that you are both in the same reference frame, which is only possible when there is no relative velocity between the two of you. The absence of acceleration or difference in heartbeats does not necessarily imply sharing the same spacetime.

You and a Friend Share the Same Spacetime When There