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MASS AND TIME

Everything with mass carries with it its own “right now.”

Any time an object moves in any direction at all, no matter how little, its clock slows.

Simultaneity is an illusion arising from the fact that everything we see is at rest. The little imaginary clocks in every particle of mass all tick at the same rate, but that’s just a special case until one of the objects moves.

Even when they tick at the same rate, no two clocks are never synchronized.

They’re all ticking independently. If someone happened to synchronize them earlier, that’s a special case.

The only actual limit on simultaneity is imposed by special relativity. You can’t disturb your own past, and you can’t disturb anyone else if they’re far away from you.

It is literally meaningless to ask what is happening now in another galaxy, because your “now” is something you own yourself. Your clock belongs to you. It’s not shared with anybody in another galaxy or even anyone else in the same room.

Say two people are exactly the same age, And they’re sitting on the sofa watching TV. If one of them stands up to go to the bathroom, changes their mind, and then sits back down, that person is now younger than the one who sat still.

No two clocks are ever synchronized. The best you can hope for is that they tick at the same rate until one of them moves.