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A theoretical “shortcut” between two points in space-time made possible by a singularity. In science fiction, wormholes allow people and starships to travel from one part of the galaxy to another almost instantaneously. While theory allows wormholes to exist, they would make poor passageways because they should close up as soon as anything tries to enter them.

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Time machines

Time to Ponder September 20, 2019

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Time Machines Taking a trip into time September 20, 2019