@jiberish001 - it's a analogy... The earth (3D) appears flat (2D) while we're standing on it, and its curvature only becomes apparent with distance. Likewise, the universe (4D) appears flat (3D) from any given viewpoint and its inherent curvature only becomes apparent from extraordinarily great distances or with the passage of time.
"Since the universe has a flat geometry"... what!? Who wrote that? It makes no sense. Perhaps you could define what they mean by "flat"?
jiberish001 1 year ago
@jiberish001 - it's a analogy... The earth (3D) appears flat (2D) while we're standing on it, and its curvature only becomes apparent with distance. Likewise, the universe (4D) appears flat (3D) from any given viewpoint and its inherent curvature only becomes apparent from extraordinarily great distances or with the passage of time.
djxatlanta 1 year ago