*‘In physics time-reversal symmetry is a mathematical operation of replacing the expression for time with its negative in formulas or equations so that they describe an event in which time runs backward or all the motions are reversed.’*- quote.

In GR there is no absolute time, time dimension etc. There is spacetime.Time is something that is ‘perceived’ by particles.

Time is only needed to describe that nothing happens anywhere at the same moment.

Mathematical models give us singularities, for example, we cannot confirm it by any observation.

Big bang, speed of light, spacetime singularity are concepts that are accepted, because the universe model description needs start points and limits.

We are able to observe black holes, but the majority of theories and phenomena are not confirmed due to the extremes of such observations.

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