Science

Yes it's 'caused' by mass existing within space, but ultimately the 'cause' of gravity (as we perceive it) is that this mass causes 'time' to run more slowly at, say, the surface of the earth than it does ... away from the earth.

Yes, the difference in the speed that time is running is unbelievably tiny in scope (a whole lotta zeros are involved), but ultimately, the reason that cup falls to the floor when you drop it ... is because time is running every-so-slightly faster at the level of your hand ... than it is at the level of your floor.

Time is not an absolute thing, you see. It is 'relative'.

Fun Fact