A space-time anomaly, or "portal," through which the fearless spacefarer may travel to distant sectors of the galaxy
After a body falling into a rotating black hole is torn apart and reduced to elementary particles by tidal effects, it may be possible for those particles to miss the singularity, travel through a small hole or tunnel in spacetime (called a wormhole) to another universe or another part (or time) of our own universe
A thin tube of space-time connecting distant regions of the universe Wormholes might also link to parallel or baby universes and could provide the possibility of time travel