Hypothetical Object
Wormhole (Einstein–Rosen Bridge)
A theoretical tunnel through spacetime.
Hypothetical shortcuts connecting distant regions of spacetime. Stable, traversable versions would require exotic matter with negative energy density.
Overview
Hypothetical shortcuts connecting distant regions of spacetime. Stable, traversable versions would require exotic matter with negative energy density.
See also
Black Dwarf
A theoretical cold white-dwarf remnant.
White Hole
A theoretical time-reverse of a black hole.
Traversable Wormhole
A hypothetical wormhole one could pass through.
Blue Dwarf
A predicted future fate for some red dwarfs.
Gravastar
A black-hole alternative made of exotic vacuum.
Quark Star
A neutron star compressed into quark matter.