What is the Grandfather Paradox? On this explainer, Neil deGrasse Tyson and comic cohost Chuck nice discuss destiny, tachyons, and the most famous time travel paradox: the Grandfather Paradox.

What would happen if you traveled back in time and prevented your parents from meeting each other? We break down the paradox’s role in pop culture through The Terminator and Back to the Future. Are there other major and minor events that could prevent your birth? Find out how using subatomic particles like tachyons could help you communicate with your past self. Will some things turn out to be inevitable? What’s the butterfly effect named after? This time travel explainer will have us saying “I’ll be back.”

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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic cohosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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0:00 Introduction
0:30 Grandfather Paradox In Movies
6:07 Tachyons
7:47 Can You Change The Future?
11:47 Closing Notes