I always thought space and time go together. I'm going to be really picky. this should be in every intro to physics text book ever. We have complete freedom of movement within space, but we cannot avoid our future. Maybe, but that's the subject of another article…. It's impossible to think of them as separate entities, only a singular unified entity — space-time. No, people from the future wouldn't visit those "present now" and I'm taking that in the strictest sense, although I'm sure you weren't. Einstein suggests that time is just a fourth spatial dimension that we add to the three-dimensional space we're used to thinking about. The inevitable progression of time from the past to the future resembles another indomitable law of nature: entropy. And if you have a news tip, correction or comment, let us know at: email@example.com. i nearly fell off the chair reading it and now i have to put my eyeballs back in. Future US, Inc. 11 West 42nd Street, 15th Floor, Receive news and offers from our other brands? I feel like when I'm thinking about things pretty hard, time passes slower as well. You can't change that any more than you can change that matter takes up space, protons have positive charge, etc. The most important concept you'll need is the concept of a space-time manifold. so if you plug in half the speed of light you get ~0.866 so you will be moving through time 0.866 times as fast as someone sitting still. You moved a bit more slowly forward in time, so that you could move through space. That constant speed that everything is moving at is just one of many 'constant' facts about the universe. My running theory of time travel is that all things spawn an infinite number of disparate time streams. Time may only be chronological in our perceptions, but if this were so, wouldn't we also be everywhere we've ever been simultaneously? Well, it's the speed of light. Get breaking space news and the latest updates on rocket launches, skywatching events and more! r/AskReddit is the place to ask and answer thought-provoking questions. Well, the answer is now very complex. Yes, time travel is indeed a real thing. You will receive a verification email shortly. Press question mark to learn the rest of the keyboard shortcuts, http://fog.ccsf.cc.ca.us/~wkaufmyn/ENGN37/Course%20Handouts/ENGN37_Chapter_11_Review_IMAGES/Chap11_xy_coordinates.JPG, http://www.reddit.com/r/askscience/comments/fjwkh/why_exactly_can_nothing_go_faster_than_the_speed/c1gh4x7. Sounds crazy, who knows. There are about half a dozen known configurations of space-time that allow CTCs, or time travel into the past. We can now think of every object as being situated inside this 4D manifold called space-time. Space is part of Future US Inc, an international media group and leading digital publisher. Under certain conditions, it is possible to experience time passing at a different rate than 1 second per second. And there's no more explanation for that fact than "well, that's just the way things are.". If I could time travel I wouldn't want to try changing anything and I wouldn't tell anybody that I was a time traveler but I would like to learn as many thing's as possible by going to the ancient past and learn from old masters, what would you do if you could time travel? "Curve" here means a path, "time-like" means you never go faster than the speed of light, and "closed" means it returns to its starting point — in other words, its own past. Every possible interaction has multiple reactions. It seems like something funny is afoot, that there ought to be some fundamental rule to disallow time travel. A bit of paradox it is Since it is possible to see our past and best example is our own image in a mirror or observing any planet or star light years away from us What we see is the past of it as light may be fast but not enough to show the present but we don't have any way to change the past and if we found a way and try to change the … It's just a basic fact about the universe that everything's moving forward through time at a constant rate. But Gödel's point was moot — all observations indicate that the universe is not rotating, so that particular solution does not apply to our universe, and time travel into the past is verboten. But your question is presumably whether we can know with confidence that we can't go backward or jump forward in time. 1. Thanks to Jack S., Evan W., @myscienceylife, and @TanyaDavis. For example, Kurt Gödel (of Gödel's Incompleteness Theorem fame) discovered that if the expansion of the universe was accelerating (which it is) and the universe is also rotating, CTCs would be allowed and we could travel into our past on a whim. Let me clarify by saying that time travel IS possible, but when we tug at the strings of the time/space continuum we will undoubtably begin to unravel the threads of universe itself. So, I think you've asked a question whose answer will be unsatisfying in direct proportion to how short it is. I would say uncertainty in our own perceptions makes sense, however disregarding them leaves us blind. How Time Travel Works in Science Fiction (Infographic), Pictures from space! I've tried to give something a little better than the first, and far, far short of the second. Wells' The Time Machine (1895), the actual science of time travel didn't come into being until well into the twentieth century, as a side-effect of Albert Einstein's theory of general relativity (developed in 1915). Travel to the past I believe is possible just very hard and possibly limited to when the time machine was turned on. for the questions that led to this piece! are you carl sagan, reincarnated? I was able to follow it throughout without losing track of anything, thanks! Please deactivate your ad blocker in order to see our subscription offer. 357 votes, 270 comments. So, we used to think of time as a track that everything moved down at a constant rate. The speed of light constant is a lower case c. Otherwise, BRAVO! It seems that we can't. So now, remember that constant speed I said you (and everything else) were moving at through space-time? And when you sit back down, those 2mph are returned to movement through time. Is time travel to the past possible? Perhaps my judgement is flawed here, but you seem to contradict yourself to me. Seriously, though, that was fantastic. Our image of the day, Effect predicted by Albert Einstein spotted in a double-star system, New Hummer EV was GM's 'moonshot,' features nods to Apollo 11. Time is just a made up thing that humans created. Like i would back to the making of king kong 1933 and show the directors and writers real gorilla behavior and biology also what we learned of dinosaurs. When you sit down, you're moving at the speed of light (186,000 miles per second) through space-time. Thank you for signing up to Space. The first thing is to get some basic conceptual vocabulary down. I believe time travel is scientifically possible using wormholes or extremely fast travel but not by supernatural means, I believe in the supernatural but I dont … That's the iron law of thermodynamics that states that closed systems go from ordered to disordered. And we can alter the speed at which we move through time by moving through space at different rates. Visit our corporate site. A seemingly minuscule reversal or alteration of predetermined order would set off a series catastrophic events in an attempt by the universe to maintain or correct its natural trajectory that I believe would cause the universe to begin to break down. It’s been well established that time travel to the future is real. How can something that doesn't exist be traveled through? We can't think of motion through space without being mindful of motion through time, and vice versa. Time is relative, but it still flows in the same direction for everyone. 30.1m members in the AskReddit community. There was a problem. This illustrates the fact that the faster you move through space, the slower you move through time. Why you can't go back in time is sort of an unanswerable question. What we can do, however, is divert more or less of our speed through space-time in the space direction. Maybe the speed at which my mind is analyzing things also takes away from my movement in time. What happens at the center of a black hole? Well, hmm. Relative to each other are they still going twice the speed of light? You can travel to the future special and general relativity prove that. You weren't moving through space at all. Just take it as granted that we've discovered, empirically, that objects all seem to move at a constant rathe through this 4D manifold of space-time. I believe time travel is scientifically possible using wormholes or extremely fast travel but not by supernatural means, I believe in the supernatural but I dont … thank you. Why do objects move at a constant speed? This is a consequence of another lesson from relativity: Not all clocks are the same. Good thing there are no infinitely long massive cylinders in the universe, or we might have to worry. from what I've seen this subreddit is mostly baseless claims of people who want attention. Is time travel possible ( self.defectorgalaxy) submitted just now by defectorgalaxy. While reading the part about slowing down our progress through time, it hit me like a ton of bricks...we get so impatient sitting in traffic and waiting in line or just when others prevent us from going where or doing what we want, not just because we are in a hurry, but because we are very literally and physically "wasting time". And, conversely, the slower you move through space, the faster you move through time. The short answer is that we know we can't travel back or jump forward through time because it seems that the speed of light is constant. Join our Space Forums to keep talking space on the latest missions, night sky and more!
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