Is the Big Bang notion compatible with the flat space? (A problem with the **moment** of Big Bang, not with the place of it)
4276
Did the Big Bang happen at a point?
60364
Universe Expansion as an absolute time reference
56103
Is the universe finite or infinite?
137342
Can spacetime be non-orientable?
10553
Does the universe have an edge/boundary/barrier? If yes, what is at the edge?
24669
Time dilation at the Big Bang
115517
How could we know that the relativistic curvature of universe is intrinsic?
37587
What has been proved about the big bang, and what has not?
21084
Size of the universe
48495
Is it possible to prove the independence of the parallel postulate without non-euclidean geometry?
68188
Are scientists missing the point with distant cosmic objects, or is it just me?
143235
Twin Paradox, calculating spacetime intervals from both perspectives
2073
Conservation law of energy and Big Bang?
99342
Given that matter cannot escape a black hole, how did the big bang produce the universe we see today?
145003
How can a point-like particle "feel" gravity, if locally the curvature of spacetime is always flat?
158214
General relativity: is curvature of spacetime really required or just a convenient representation?
119217
If particles are points, then aren't atoms empty space?