A universe from nothing
2377
Is the total energy of the universe zero?
51901
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
48495
Is it possible to prove the independence of the parallel postulate without non-euclidean geometry?
42343
Is spacetime all that exists?
10362
Does the universe have a center?
76670
Are We Living in a Simulated Universe?
135755
Many-worlds: how often is the split how many are the universes? (And how do you model this mathematically.)
67531
Universe being flat and why we can't see or access the space "behind" our universe plane?
24003
Is the universe fundamentally deterministic?
59757
Is a world with constant/decreasing entropy theoretically impossible?
63748
What does it mean that the universe is "infinite"?
5930
Why is the observable universe so big?
149430
Why does the universe exhibit three large-scale spatial dimensions?
2983
Shape of the universe?
75788
Is spacetime absolute?
152130
Maximum size of the observable universe?
136281
Is the universe expanding, or is everything in it getting smaller?