If space has an open geometry what will happen to two initially parallel flashlight beams as they traverse billions of light-years of space?
A) They will remain parallel.
B) They will gradually diverge (move apart)to a maximum separation,and then gradually converge and cross.
C) They will gradually converge (move together)and eventually cross.
D) They will gradually diverge (move apart).

Question

Quizplus · Accepted Answer

In an open geometry, the universe is negatively curved, causing initially parallel light beams to gradually diverge or move apart from each other as they travel through space.

If Space Has an Open Geometry What Will Happen to Two