What shape is the universe?

Q: What shape is the universe?

Best current data says: flat, but we can’t be 100% sure.. Cosmic microwave background measurements are consistent with a flat universe within 0.4% error. Slightly curved (open or closed) is still possible. We live in geometry we can’t step outside of.

Question

Accepted Answer

Best current data says: flat, but we can’t be 100% sure. — Cosmic microwave background measurements are consistent with a flat universe within 0.4% error. Slightly curved (open or closed) is still possible. We live in geometry we can’t step outside of.