How would time travel work? Journey back through some of StarTalk’s favorite time travel moments from the past, covering topics like The Grandfather Paradox, wormholes, and tachyons. Featuring Brian Greene, Joseph Gordon Levitt, Colin Jost, and more!

What would time travel look like to an outside observer? Learn about how time travel through wormholes would work, The Grandfather Paradox, and whether the timeline cares about major events versus minor events. Is time travel to the past even theoretically possible? We break down ways we are already time traveling through time dilation. What would it be like to look at time from a higher dimension?

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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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Timestamps:
00:00 What Would Time Travel Look Like to an Observer?
3:36 TIme Travelling Via Wormhole
5:18 The Grandfather Paradox
12:16 Time Travel in Looper
17:00 Causal Loop Paradoxes
19:49 If There Are No Time Travelers Now, Could There Be in The Future?
22:44 Time Travel in Interstellar