WAJsal
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Are you talking about a Worm hole? Wormhole is a shortcut through space-time. In short it is like a tunnel through which you can reach from one point to another, has nothing to do with time travel.Actually time travel doesn't violates principles of physics. One way to travel backward in time is Einstein-Rosen bridges that connect two distance point in space-time and was proposed by Albert Einstein and Nathan Rosen in 1935. Although it is yet to be proved that such bridges exist in the Universe.
A wormhole, also known as "Einstein-Rosen Bridge"
Wormhole - Wikipedia, the free encyclopedia