Theoretical tunnels through space-time that could connect distant points in the universe; or actual holes made by worms in soil or wood.
Compound of 'worm' and 'hole.' The physics term was proposed by Einstein and Rosen in 1935 as a theoretical concept.
Einstein's equations actually allow for wormholes mathematically, but we've never found one—they're one of physics' greatest unsolved mysteries and a favorite of science fiction!
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