What will happen if one reach the boundary of the Universe?
2983
Shape of the universe?
38460
What happens when a black hole dies?
126134
What would happen if you portalled the TARDIS inside itself?
20511
Is it possible to experimentally show that observable universe is much larger than ~93B ly?
44311
The Cracks in the Universe: Why are they lethal to some, but not to others?
102774
What happens when an electric charge crosses the event horizon?
60364
Universe Expansion as an absolute time reference
683
Do new universes form on the other side of black holes?
10362
Does the universe have a center?
41750
The age of the universe
103420
What happens if Superman is near a white dwarf star?
92674
Could spontaneous symmetry breaking happen again in our universe?
65985
How can the universe by infinite when it has known start and finite time since?
15538
If the Universe is expanding, how is that galaxies run into each other?
119747
What is the meaning of the "expansion of space"?
74958
Dark age of universe when all fusion process ceases?
2253
If the universe is expanding, what is it expanding into?