In
science fiction,
hyperspace (
subspace in
Star Trek) refers to a region somehow alongside and connected with our own
universe (in some cases displaced in the fifth
dimension) which may be entered using some sort of energy field. Often spacecraft have some sort of drive capable of taking it into hyperspace, which has either different physical laws or a different geometry, allowing the craft to cross the universe at
faster-than-light speeds and hence facilitating
interstellar travel.