A RELATIVITY PARADOX OF THE BIG BANG COSMOLOGY

Light from the past is received from about 12 billion light years away.

According to Big Bang Cosmology, all the mass-energy of the universe was then tinier than an atom. How, then, does it take light 12 billion years to reach us? One answer is that the universe initially expanded with speeds greater than that of light, which does not contradict special relativity theory inasmuch as no information of events is received faster than light speed. A general relativity explanation is that light speed was then much slower in the denser gravitational field. By this explanation, the spacetime of any part of the mass-energy to any other was then relatively the same as it is now, such that the only evidence of expansion is the redshift in starlight from more distant stars, which can also be interpreted according to a "tired light" theory.