Is Time Travel, Especially Into the Past Possible? | Matt Szydagis | TEDxSchenectady
15:01
Have you ever imagined how interstellar travel could work? | Ryan Weed | TEDxDanubia
17:30
Why We are Alone in the Galaxy | Marc Defant | TEDxUSF
22:31
Filling the Big Gap in Einstein’s Theory | Paul Steinhardt | TEDxCLESalon
19:27
You are a Simulation & Physics Can Prove It: George Smoot at TEDxSalford
16:06
Cosmologia e a flecha do tempo | Sean Carroll | TEDxCaltech
23:45
Fermi's Paradox and the Psychology of Galactic Empires | Matthew O´Dowd | TEDxTUWien
10:25
Extraterrestrials - Why They're Almost Certainly Out There... | Chris Crowe | TEDxJohnLyonSchool
14:59