> Now, of course there is a difference between time and space, so that can’t be all there is to space-time. You can move around in space either which way, but y

> Now, of course there is a difference between time and space, so that can’t be all there is to space-time. You can move around in space either which way, but you cannot move around in time as you please. Not really. The instant you move in space, you also move in time, and since everything is moving and there is no fixed frame of reference, technically you can never move back to the same spot where you started. So even though it might appear to us, at our perception scale, that we can move back and forth in space, in reality whenever we move, space changes and so it's just like moving in time, there is no going back.