Stephen Hawking. (№ 409387)

The laws of science do not distinguish between the direction "forward" and "backward" in time. But there are at least three arrows of time that distinguish the future from the past. This is a thermodynamic arrow, that is, the direction of time in which disorder increases; the psychological arrow is the direction of time in which we remember the past, not the future; the cosmological arrow is the direction of time in which the Universe does not contract, but expands. I have shown that a psychological arrow is practically equivalent to a thermodynamic arrow, so both of them must point in the same direction.