Wormhole theory

thumb|upright=1.3|A wormhole visualized as a two-dimensional surface. Route (a) is the shortest path through normal space between points 1 and 2; route (b) is a shorter path through a wormhole.

unusual or hypothetical physical substance or state

hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter

Ring-shaped gravitational singularity of a rotating blackhole