I recently was told that we know there’s only one time dimension because otherwise we’d pivot between different dimensions of time, as we are able to do in space. But I still don’t understand, other than paradoxes and causality, why we can’t move backwards in time.
Even on a 1D spatial plane [edit to say yes… a line, not a plane.] we would be able to move forwards and backwards.
But we can’t with time. Why?
In: Physics
Mass and energy are the same thing, each can be converted onto the other, so I will just refer to them both as mass.
The universe has a finite amount of mass, it stays the same whatever happens. Travelling back in time would mean that your mass would be added to the mass of the universe. But the mass of the universe is constant so this cannot happen.
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