Special & General Relativity Questions and Answers
Is there such a thing as hyperspace?
We do not really know, but as you can see from my Essays on Hyperspace, science fiction authors have enjoyed speculating about this for decades! Physicists have long speculated that, based on the mathematics they need to describe the forces in nature, that nature must have some other dimensions attached to it other than the familiar 4 that make up ordinary spacetime. But it is pretty well agreed that these added 'hyperspace' dimensions are a billion billion times smaller than the nucleus of an atom, and only subatomic particles can flit in and out of them.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.