(Eli5) Can someone please explain the four dimensions (Einstein’s theory) to me?

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I didn’t pay attention in School and I regret that now. Please help me understand some aspects here. I read about Time being the fourth dimension but I am just having difficulty grasping this information.

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Anonymous 0 Comments

If you were in a 3D space and could only see a plane (an infinite, 2D flat surface that has x/y axes for the sake of simplicity) at a time, then moving across the z axis would allow you to see different slices of a 3D space, but you would still only see a 2D slice in any given moment.

Time is the similar: in any given moment, you can only see and interact with a 3D space, but as you go forward/backward in time, you get to see different 3D spaces.

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