text: Once, when Albert Einstein stepped off of a plane, he was asked by a reporter to explain the theory of general relativity in one or two sentences.  Einstein said something like this: "We used to think that if you took all of the matter and all of the energy out of the universe, all that would remain would be space and time.  Now we think that if you took all of the matter and all of the energy out of the universe, all of the space and all of the time would go with it".  Space, time, matter and energy share such a deep interrelation that it's very likely that they're, somehow, all the same thing.  There isn't any new space... the space we have has only stretched like a balloon.