We constantly move at the speed of light through space-time. If we start to move through space, we slow down through time. If we go full speed through space,

We constantly move at the speed of light through space-time. If we start to move through space, we slow down through time. If we go full speed through space, like a photon, we will not experience time at all. So from the perspective of a photon, everything happens at the same time, from the big bang to the heat death.