Is the Universe inside the event horizon of a white hole or a black hole or none?
3994
Is the observable region of the universe within the event horizon of a super-massive black hole?
152130
Maximum size of the observable universe?
86456
Could the universe's antimatter be hiding in black holes?
99841
Is it mathematically possible for a black hole to be connected to a white hole or a worm hole?
141330
Are black holes really singularities?
39940
Is spacetime flat inside a spherical shell?
95986
Where is the black hole information paradox?
14728
Can black holes form in a finite amount of time?
60687
Solid objects inside the event horizon - can they remain "solid"?
119336
Zero energy universe
4087
Did spacetime start with the Big bang?
12992
Why did the universe not collapse to a black hole shortly after the big bang?
9643
Black holes are transparent?
95295
Is the Universe Past-Eternal?
88969
Are black hole regarded as baryonic matter in cosmology?
117108
Is the Universe being dragged into a singularity rather than expanding?
683
Do new universes form on the other side of black holes?