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The equations of physics suggest time should be able to go backwards as well as forwards. Experience suggests, though, that it cannot. Why? And is time travel really possible? Click here to subscribe to The Economist on YouTube: http://econ.trib.al/rWl91R7 Why does time pass? It is a question so profound that few people would even think to ask it. Yet its effects are all around. Human beings live in a perpetual present, inexorably sealed off from the past, but moving relentlessly into the future. For most people, time seems to be something that is just out there. A thing ticking away in the background - fixed, immutable. Time seems to go in one direction and in one direction only. But physicists see it much differently. One of the great minds who changed the way science thinks about time was Albert Einstein. In 1905 he published his special theory of relativity. In it he demonstrated that time passes differently in different places depending on how those places are moving with respect to one another. Einstein showed that the faster one travels the slower time goes for the traveler. At the speeds at which humans move this is imperceptible. But for someone traveling on a spaceship at speeds close to that of light, time would slow down compared with its passage for people on earth. There was another important aspect of Einstein's theory which he didn't even realize when he published it. That time was woven into the very fabric of space itself. Einstein used this insight to help develop his general theory of relativity which incorporated gravity. He published it in 1915. With the general theory of relativity he demonstrated that massive objects warped the fabric of space-time. It is this curvature that causes time to slow down near them. Time slows down in proportion to the gravitational pull of a nearby object so the effect would be strong near a black hole but milder near the earth. But even here it can be detected. Einstein's theories had to be taken into account when the GPS system was set up otherwise it would have been inaccurate. One scientist who puzzled over the directionality of time was Arthur Eddington, a 20th century astronomer who defined the concept of the arrow of time, based on observations made by the 19th century physicist Ludwig Boltzmann. The arrow of time is based on the second law of thermodynamics which says the disorder known as entropy increases with time. For example, a building left untouched will slowly decay into its surroundings. It will disintegrate into a more chaotic state but it is highly unlikely that the building will become more orderly over time - this is because there are many more ways for a system to be disorderly than orderly. There can be many ways for something to break for instance but only one way for it to be put back together again. A system will be less disordered in the past and more disordered in the future. This is the arrow of time. So how can the arrow of time be reconciled with Einstein's equations? If time can go forwards and backwards according to relativity does that mean it's possible to go backwards in time? The theory of relativity does allow time travel to the future. Einstein's theories do allow for the formation of wormholes in space. These are shortcuts that link otherwise distant places in the space-time continuum. Although wormholes are theoretically possible they're a highly implausible proposition. That's because the equations suggest enormous masses and energies would be required to create and manipulate one. What remains then is a mystery. Theory fails to forbid traveling backwards in time but practice suggests it might just as well be forbidden. For now it would appear the arrow of time cannot be reversed. No one knows why time passes but it seems that no matter how people look at it, it goes in one direction in one direction only. Check out Economist Films: http://films.economist.com/ Check out The Economist’s full video catalogue: http://econ.st/20IehQk Like The Economist on Facebook: https://www.facebook.com/TheEconomist/ Follow The Economist on Twitter: https://twitter.com/theeconomist Read our Tumblr: http://theeconomist.tumblr.com/ Follow us on Instagram: https://www.instagram.com/theeconomist/ Check out our Pinterest: https://uk.pinterest.com/theeconomist/ Follow us on LINE: http://econ.st/1WXkOo6
Get ready to re-think your ideas of reality. Join UCSD physicist Kim Griest as he takes you on a fascinating excursion, addressing some of the massive efforts and tantalizing bits of evidence which suggest that what goes on in empty space determines the properties of the three-dimensional existence we know and love, and discusses how that reality may be but the wiggling of strings from other dimensions. Series: "Atoms to X-Rays" [5/2001] [Science] [Show ID: 5551]
Professor John R. R. Searl, the inventor of the Searl Effect Generator (SEG). With our World in the midst of an emerging energy crisis along with massive and constant environmental damage from forest destruction to ever-increasing greenhouse gas emissions of epic and catastrophic proportions. Prof. John Searl offers a global solution that can harness economically clean, sustainable and unlimited renewable energy. Modern magnetic materials have advanced considerably, and old ones discontinued, so a series of tests need to be conducted to establish the optimum materials and processes, These tests need to comply with the working criteria required and must lead to a cost-effective manufacturing process. In recent times SISRC has been re-establishing the original research. Due to the very limited funding that has been available, only a partially functioning demonstration prototype of the SEG principles has been possible. This prototype consists of the innermost of the three composite tings required and several rollers…" "Understanding the SEG - Reality of Costs/ "Blueprints" - Mock Up vs Prototype - Coherence vs Chaos - History of John Searl - Current Status of Project & Context. Please read through the material, visit the listed links and take the time to look into the available info." by Jason Verbelli https://www.scribd.com/document/7914592/Searl-Effect-Generator DONT FORGET TO LIKE, SUBSCRIBE, click the bell button next to the subscribe button to receive future videos, AND SHARE AROUND with friends, family and social media if you enjoy this content. STAY TUNED FOR THE NEXT VIDEO! My video Playlists! My Science and Breakaway Technology Playlist! https://tinyurl.com/y9dfm9zt my Documentaries, Presentations and Films playlist! https://tinyurl.com/yd8nhezm My Health and Nutrition series Playlist! https://tinyurl.com/y8647wwq my Interviews and Shows playlist https://tinyurl.com/y7toscc3 LIVE broadcasts, Webinars and Events! https://tinyurl.com/yar3abh5 understanding symbolic language full video playlist! https://tinyurl.com/yb2hmec5 see my full "Symbols of Power" Linguistic Occult Symbolism film series for so much more. https://tinyurl.com/ybmbw9bj My Government and Conspiracy playlist! https://tinyurl.com/y9mvqxbg All Lifting The Veil's videos https://tinyurl.com/y7zv9qae Healthiest Water: Structurizing Filtration Systems! https://tinyurl.com/y8yhfrno @Lifting_TheVeil is now on all social media. All of my full video presentations and articles can be found at patreon.com/LiftingTheVeil for full #esoteric film presentations, research articles, livestream hangouts, lessons and so much more mind blowing esoteric content on #theology, #mythology, #etymology and #language, #symbolism, #science, #biology, #health and so much more! SEE YOU SOON! MUCH LOVE, PEACE AND WISDOM! SUPPORT Lifting The veil : patreon www.patreon.com/LiftingTheveil Paypal https://www.paypal.com/pools/c/80CrErBse9 Ethereum: 0xbbda2c6111001ddbd204f39e826fb0401383852c my social media links: YOUTUBE: MAIN CHANNEL https://tinyurl.com/y7apd59e My second Livestream channel: https://tinyurl.com/ybxcnt8w facebook: https://tinyurl.com/ya5dkssb facebook personal: https://tinyurl.com/y84jfgsp steemit: https://tinyurl.com/yacx4n8q DTube: https://tinyurl.com/y7aht4qm BitChute: https://tinyurl.com/ya2fqshh twitter: https://tinyurl.com/ycqr9ltn Instagram: https://tinyurl.com/y93zolqe minds: https://tinyurl.com/ycgkdpo5 Onstellar: https://tinyurl.com/yawwr284
Explains how and why gravity affects the flow of time according to General Relativity.
What if we could find one single equation that explains every force in the universe? Dr. Michio Kaku explores how physicists may shrink the science of the Big Bang into an equation as small as Einstein's "e=mc^2." Thanks to advances in string theory, physics may allow us to escape the heat death of the universe, explore the multiverse, and unlock the secrets of existence. While firing up our imaginations about the future, Kaku also presents a succinct history of physics and makes a compelling case for why physics is the key to pretty much everything. Don't miss new Big Think videos! Subscribe by clicking here: http://goo.gl/CPTsV5 Kaku's latest book is The Future of the Mind: The Scientific Quest to Understand, Enhance, and Empower the Mind (http://goo.gl/kGrVaR). The Universe in a Nutshell: The Physics of Everything Michio Kaku, Henry Semat Professor of Theoretical Physics at CUNY The Floating University Originally released September, 2011. Directed / Produced by Jonathan Fowler, Kathleen Russell, and Elizabeth Rodd
Gravity and Time