Miscellaneous
 
 
Conceptual image showing a wormhole or Einstein-Rosen bridge Wormhole Transit (2002)
Done for the UK magazine Astronomy Now, this is a conceptual illustration of a wormhole. These are hypothetical tunnels through spacetime that permit you to travel from A to B faster than light would go if light took the long route. They might also be used for time travel. If they actually exist — and it's a big 'if'.
See also
Infinite universes linked by wormholes