The Earth Is Not Flat

If the earth was flat, you and i started walking in one directiona we would keep walking at the same distance from each other all the time. But that's curvature. In flat space, two photons moving i paral will not approach each other. And so motion constrained along a curved surface, or motion through curved space, cold make things that initially were parallel move towards each other. So the earth is not flat. Although idon't know what north would mean on infinite flat earth, though i'm sure the flat earth rerths had figured that out somehow. All right. You've seen a the universe means that the two photons would eventually either collide or move away from each