Do absolute space and time exist?
75788
Is spacetime absolute?
140798
Is there absolute proof for gravitational waves?
67661
Is there an observable of time?
13662
Did time exist before the Big Bang and the creation of the universe?
129542
Do perfect spheres exist in nature?
54395
Is Poincare recurrence relevant to our universe?
65001
Universe from nothing?
38454
Do anti-photons exist?
42372
Space Expansion vs. Relative Motion
117205
Expansion of the Universe: is new space(time?) being created or does it just get stretched?
145603
Would time still exist after Heat Death of the Unverse?
158250
According to special relativity, has the future already happened?
26769
Why does string theory require 9 dimensions of space and one dimension of time?
20872
Is it possible for a physical object to have an irrational length?
49682
What axiomatizations exist for special relativity?
100530
Why does time in Minkowski's space have the opposite sign of the space coordinates?
10362
Does the universe have a center?