Wormhole/ˈwɜːrmhəʊl/ Definition 1 of 2Pro Tip 1/3Science Fiction Often used in science fiction to describe shortcuts through the universe. The film depicted a wormhole as a portal to another galaxy. Pro Tip 2/3Theoretical Concept A wormhole is not proven to exist; it's a concept from theoretical physics. Physicists debated the possibility of a wormhole connecting distant stars. Pro Tip 3/3Time-Space Connection Wormholes are believed to link separate points in spacetime, not just space. Could a wormhole really allow travel back in time?