Is the universe infinite?
56103
Is the universe finite or infinite?
143065
Fine Tuned Universe
2742
Is infinity a number?
16647
Is the world $C^\infty$?
89301
Is the total energy of the universe constant?
58388
Counterexamples to the continuum hypothesis
51901
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
62473
Arguments for the existence of infinity
70008
Virtual Particles real? Virtual particles create a universe?
21084
Size of the universe
59757
Is a world with constant/decreasing entropy theoretically impossible?
104940
Are infinite reflections between two mirrors really infinite?
37991
How many different sizes of infinity are there?
43309
What exactly is infinity?
47736
Does anything you can think of exist?
86167
Why are infinite cardinals limit ordinals?
146560
Is there any uncountably infinite set that does not generate the reals?