Age versus size of the universe
5930
Why is the observable universe so big?
149674
Kinetic energy of a photon and Schwarzschild radius
75058
Why isn't an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein's equation?
107364
What are the differences between dark energy and a cosmological constant?
79708
Is the energy density of vacuum uniform in the whole universe?
24669
Time dilation at the Big Bang
82440
As the universe ages, will we see more stars or less?
58388
Counterexamples to the continuum hypothesis
53434
Units in gravitational $N$ body simulations
96775
Einstein's static universe concept
117108
Is the Universe being dragged into a singularity rather than expanding?
143065
Fine Tuned Universe
42372
Space Expansion vs. Relative Motion
21662
What was the density of the universe when it was only the size of our solar system?
82441
Physical laws prior the big bang (quantum fluctuations)
56103
Is the universe finite or infinite?
24003
Is the universe fundamentally deterministic?