If space has a hyperbolic geometry (open universe), what will happen to two initially parallel laser beams as they traverse billions of light-years of space?
A) The beams will gradually diverge (move apart).
B) The beams will remain parallel.
C) The beams will gradually diverge (move apart) to a maximum separation, then gradually approach and cross.
D) The beams will gradually approach each other and eventually cross.

Question

Quizplus · Accepted Answer

In a hyperbolic (open) universe, the geometry of space is such that parallel lines will diverge over distance, meaning two initially parallel laser beams will gradually move apart from each other as they travel through space.

If Space Has a Hyperbolic Geometry (Open Universe), What Will