The tube is a distortion of spacetime that can be intentionally created (using hypothetical technology) in the wake of travel near the speed of light. The Krasnikov Tube allows for a return trip that takes you back to the time right after you left. This several light-year long man-shaped “tube” might arguably constitute a megastructure, but unlike most megastructures it’s not constructed of physical matter such as titanium or plastic, but instead is just a warpage of spacetime.[2]
This spacetime diagram shows the causal structure of a Krasnikov tube; the U-shaped line is the boundary of the tube, while the diagonal lines represent the forward light cones of the dots.
Experiencing the effect requires that the traveller races along the tube at speeds close to that of light.
via Krasnikov tube – Wikipedia, the free encyclopedia.
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