I’m sure I’m not really understanding gravity theory, but I have in mind the illustration of marbles on a bedsheet. If that bedsheet is space-time, why isn’t there some sort of universal up and down as objects relate to each other?
In: Planetary Science
Because it’s pushing in a dimension we can’t see.
The bedsheet analogy represents a 2D universe, and all that flexing is taking place in the 3rd dimension, which you can’t see if you’re in the 2D universe.
There’s no up or down in space, but there is an up and down in that 4th spatial dimension we can’t see, and that’s the direction spacetime flexes in.
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