All Questions
3
questions
3
votes
3
answers
476
views
Is General Relativity compatible with relative speeds bigger than $c$ between two inertial frames?
My question is motivated by a remark done by Tegmark in his book "Our Mathematical Universe". He says that GRT does not prove that relative speeds between material points are always smaller than c. It ...
- 81
3
votes
2
answers
1k
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Evidence for expansion of space [duplicate]
If I understand correctly, Einstein's theory of General Relativity predicted the expansion of space itself, and Hubble confirmed this prediction by observing the red shift of receding galaxies.
I ...
- 41
6
votes
5
answers
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Space Expansion vs. Relative Motion
Given 2 objects moving at some velocity $v$ relative to one another, is it possible to determine whether they are moving or whether the space between them is expanding?
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