If universe is expanding then relative to what?
113304
Universe expands ... compared to what?
4942
What is the relationship between Cosmic Time and Scale Factor (or Redshift)?
96564
Is it valid to apply Einstein's Relativity to scenarios involving expansion of space?
148838
Is the total mass of the universe constant in time?
7618
What is the speed of light relative to?
81495
Does the universe have a different age to different observers?
58042
Redshifting of Light and the expansion of the universe
49577
Spherical / Relative Gravity
42645
Does the universe expansion theory take into account that light emitted by massive stars is red-shifted?
67531
Universe being flat and why we can't see or access the space "behind" our universe plane?
60364
Universe Expansion as an absolute time reference
115517
How could we know that the relativistic curvature of universe is intrinsic?
152888
Schwarzschild Radius of the Universe
63748
What does it mean that the universe is "infinite"?
40150
Will acceleration rate of expansion of space become faster than speed of light?
3644
Symmetrical twin paradox in a closed universe
65566
Estimating age of the universe by Hubble's law?