Two small non-rotating spaceships are floating freely in interstellar space well

Question

Two small non-rotating spaceships are floating freely in interstellar space well outside the influence of any other objects in the universe. Which of the following conditions must be true?
(A) Both spaceships must remain forever together side by side.
(B) Both spaceships must be in the same inertial frame.
(C) Each spaceship must be in its own respective inertial frame.
(D) The distance between the two spaceships must remain constant.
(E) The distance between the two spaceships must change at a constant rate.

Explanation / Answer

(E) The distance between the two spaceships must change at a constant rate.

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