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Worm-holes in physics. they are probably called stargate wormholes. this is fiction and hypothetical.

Normally there are two stargates at the two ends of a wormhole. The direction of travel is one way for the transportation of matter from one end to another.

there is also possibility of a two way under special conditions of negative energy density.

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wormholes offer time travel . wormhole connects the black hole to white hole .so, it is one way but as we have to travel from a galaxy to another it would take very much years even if we travell at speed of light so for a solution a two way worm hole is there .
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