PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Invitation to Time Travelers: null Time travel stories are cool because both the past and future are somehow more interesting that the present and because everyone wants a redo. But so far it appears we’re doomed to live consumed by regret in the eternal, boring present. Time marches on, inexorably and only forward. Or so we thought until Einstein came along. His special and general theories of relativity changed the way we think about time forever, and believe it or not, their raw equations permit time travel. They even tell us how to do it. So let’s review the possibilities, and decide how possible they really are. Hosted by Matt O'Dowd Written by Matt O'Dowd Graphics by Leonardo Scholzer & Adriano Leal Directed by: Andrew Kornhaber Executive Producers: Eric Brown & Andrew Kornhaber End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0Q Special Thanks to our Big Bang Supporters Big Bang Alexander Tamas Craig Stonaha David Barnholdt David Nicklas Fabrice Eap John S Juan Benet matt miller Morgan Hough Quasar Mark Heising Mark Rosenthal Vinnie Falco Hypernova chuck zegar Danton Spivey Donal Botkin Edmund Fokschaner Hank S joe pearce John Hofmann John R. Slavik Jordan Young Joseph Salomone Mathew Matthew O'Connor Syed Ansar Gamma Ray Burst A G Adrien Molyneux AlecZero Andreas Nautsch Bradley Jenkins Brandon labonte Brian Dan Warren Daniel Lyons David Bethala DFaulk Frederic Simon Geoffrey Short Graydon Goss Greg Smith James Flowers Jamie Frederick John Funai John Griffith John Michael Kerr John Pollock John Robinson Jonathan Nesfeder Joseph Dillman Josh Thomas Kevin Lee Kevin Warne Kyle Hofer Malte Ubl Michael Conroy Nick Virtue Nick Wright Paul Rose Scott Gossett Sean Warniaha Tatiana Vorovchenko Tim Stephani Tonyface Yurii Konovaliuk