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How to travel through time? But what is time? Learn to question the way you thought about Time. Subscribe to this channel to watch exclusive unreleased videos and other benefits: / @rinascimentoculturale Recommended and cited books in the video: Ghisellini's book: Astrophysics for the Curious https://amzn.to/3HgvahG Carlo Rovelli: The Order of Time https://amzn.to/3TShlxw Geoffrey West: Scala https://amzn.to/47AC4ZK Carlo Rovelli: White Holes https://amzn.to/4b6z7Ds Carlo Rovelli: Seven Short Lessons on Physics https://amzn.to/47AC4ZK Subscribe to Ghisellini's YouTube channel: @gabrieleghisellini4490 If you liked this documentary, we recommend watching: • Prof. Ghisellini explains the Universe and the... Astrophysicist explains the Universe and the Multiverse • Ghisellini explains the entire history of... The history of astrophysics explained • The entire history of Physics explained... The Whole History of Physics • Are We Alone in the Universe? Astrophysicist... Are we alone in the Universe? Where are the aliens? In this engaging conference on the theme of physics and astrophysics, Professor Gabriele Ghisellini explains the concept of time, starting from what time is in a light-hearted way and with examples taken from the cinema. Astrophysicist Ghisellini explains time travel by giving examples of time machines theorized by some scientists and physicists. Traveling to the future is already possible, as predicted by Einstein's relativity. But traveling to the past is more complex, even if physics and mathematics do not foresee theoretical limits, only a mountain of paradoxes that can change the way we conceive of free will and the essence of time itself. Why is it not yet possible to go back in time? What are the paradoxes of time travel 0:00:00 what is time 46:00 Entropy causes time to flow 1:00:00 how to travel in time 1:14:00 Wormholes for time travel 1:17:20 the paradoxes of time travel 1:25:20 Big crunch, entropy, cyclical universe and big bang