What kind of curvature (geometry of space) does the universe have if the universe is just on the boundary between being open and being closed?
A) parabolic
B) hyperbolic
C) spherical
D) flat

Question

Quizplus · Accepted Answer

The universe being on the boundary between being open and being closed implies a flat curvature. This means the geometry of space is such that parallel lines remain parallel as they are extended into infinity, which is a characteristic of flat or Euclidean geometry.

What Kind of Curvature (Geometry of Space) Does the Universe