by **Teragon** » Mon Sep 07, 2015 9:25 am

An event in relativity is a point in spacetime defined by x, y, z and t.

Events separated only by space may not cause each other, while events separated only by time may do so, if they're close enough in space. If the distance between two events in spacetime x²+y²+z²-c²t² is larger than zero, they may not be causally related.

If time was visualized as a coordinate of space (even without considering the longterm inhomogenity) the universe would look very different in this direction... "spaghettified".

The laws of the universe are the same if x, y or z is reversed, but are hughely different / violated, if t is reversed.

You can stand still in space relative to other events, but you cannot stand still in time relative to them. Inside the event horizon of a black hole, time and the radial coordinate of space change their roles!

What is deep in our world is superficial in higher dimensions.