Backwards Time Travel Would Create Spooky, Self-Annihilating Twins
![time travel artistic version](http://i.livescience.com/images/i/000/077/453/iFF/time-travel.jpg?1437666434)
It's a common trope in science-fiction novels: Astronauts travel back in time by zooming through space at speeds faster than light (usually getting into trouble in the process).
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