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When Worlds Collide

Parallel universes aren’t supposed to be observable, but a cosmic crash might leave a visible sign of their existence

By
11:18am, May 23, 2008

Science fiction movies and books are full of parallel universes.

In a typical scenario, as in the movie Sliding Doors, something happens in one universe—like a woman misses a train—but in a parallel universe, the same woman catches it, setting in motion diverging life

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