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Are there theories? Yes! Do they require a long list of impossible things to work? Also yes! There are entirely valid solutions in general relativity which al
by colechristensen 3y ago
Are there theories? Yes!
Do they require a long list of impossible things to work? Also yes!
There are entirely valid solutions in general relativity which allow for an object in a pocket of spacetime with other spacetime warped around it in such a way that, more or less, space is moving but not the object.
However achieving the arrangement of spacetime to make this happens requires many things which are impossible, aren't known to exist, or require something like all the energy in the Universe to achieve.
Also there are no valid known solutions that transition from normal space to this special spacetime arrangement, so it could only exist if it always existed.
So it comes down to: we're pretty sure such things are not actually possible but we know where to look and what problems to solve if it were. Occasionally we see a paper which removes some of the impossible things from the list.
It's one of those "unlikely but maybe someday" kinds of things.