Neil deGrasse Tyson Explains the Strange Paradoxes of Time Travel

Astrophysicist Neil deGrasse Tyson explains the nature of time and the conundrums of time travel in a recent interview.

Fresh snow fallen on the clock park, a sculpture by artist Klaus Rinke made of 24 station clocks, in Duesseldorf, western Germany, on March 7, 2016. (Photo credit: MAJA HITIJ/AFP/Getty Images)

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Hey Bill Nye! How Will We Know When to Believe a Time Traveler?

If someone comes back from the future, they ought to have packed one thing in their carry on: proof.

Time travel is the fantasy that humans can’t stop hoping for. Our collective wish for a connection to the future or past floods into our culture through literature, film, television, music, and architecture. But what if it has already been done? What if someone has travelled back or forward and told us their story – would we believe them? Should we? One such case is John Titer, a self-declared time traveler who posted in online forums in 2000, claiming to come from the year 2036 and giving both vague and detailed predictions (which have not yet come true).

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