Size of the universe as a function of time
65473
How can something finite become infinite?
96775
Einstein's static universe concept
65001
Universe from nothing?
72072
How about an exact solution for the position of a planet as a function of time?
47030
Entropy as an arrow of time
81495
Does the universe have a different age to different observers?
75651
How to calculate spatial distance in space-time?
89789
Spacelike interval and length contraction
50584
Parallel universes: are there an infinite amount of universes?
50415
Value of the Hubble parameter over time
60364
Universe Expansion as an absolute time reference
95561
Gravitational waves and time
113304
Universe expands ... compared to what?
124618
How can we know the time frames for events in the early universe?
21662
What was the density of the universe when it was only the size of our solar system?
20511
Is it possible to experimentally show that observable universe is much larger than ~93B ly?
4132
What is the closest general-relativistic equivalent of a "time slice"?