Find the answer for Time travel or parallel universes, in sci-fi from the people who brought you the USA TODAY Daily Crossword Puzzle.
Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of ...
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Star Trek's mirror universe: A pioneering alternate reality
In the season 2 episode "Mirror, Mirror," Star Trek perfected the alternate universe trope long before Hollywood's multiverse obsession.
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