Just finished Everything everywhere all at once, and it left me wondering: could we ever connect with versions of ourselves across parallel universes, like in the movie? The idea of tapping into other realities for skills, memories, or even emotions is fascinating. Do you think something like this could be possible? And if so, how might it work? Would love to hear any theories or insights on the concept of connecting across universes!

Even though our body may be tied to this time frame, our consciousness isnt.

Age 10, living in Mauritius island, I was told my superstar cousin was coming to visit us from Holland. He was in the dutch junior national football team.

I had never seen him before. This as in 1985. And I fell asleep wondering what he'd look like. I was woken up with a powerful image of his face. I was shocked by the energy that came with the vision.

3 weeks later, I greeted him and he was exactly what I had seen in my sleep.

A second occurence was when at 18, I was stressed out and worn out studying for my final exams. Passing would mean higher education and access to new people.

I remembered my ability to 'see the future' and as I laid in bed, at midnight, in the fumes of mosquito repellent, I asked with my inner voice for a sign if I was going to pass that exam. That night, I dreamed of a strang scene. It happened in a kitchen I had never been in. With people I called by name. Ben, David and Adam. Then a fight broke out between them as they saw a coin on the floor. I woke up thinking 'what a strange dream' and assumed it was a sign I'd pass the exam since they spoke english in my vision.

A year later, had totally forgotten about that and I recognized the scene I was in. I told my friends about a deja vu feeling. They laughed. I said 'Ben is going to barge in saying some silly things'. Ben got in. They laughed at his joke. They sat at the kitchen table until someone spotted a coin. And fought for it.

I realized we have the power to ask ourselves about signs. There is no way our mind can make up random visions that actually turn true.

I think our mind knows how to timetravel. We just have to question it with focus.

So I was talking to a friend about those "remove one of these from existence" memes and we were debating what would have the smallest consequence. It got him wondering if there was any stories out there where someone time travelling and messing with something in the past doesn't have negative outcomes on the present. Like a character knowingly going back in time to stop a bad thing from happening and when they return everything is still normal, just without that bad thing having happened. I guess this would cause problems with like "what would the conflict be then" or something, but it did get me curious on if it's been told before.

I've heard all of the various paradoxes that can occur from travelling to the past but I've always wondered, since the number of molecules that make up our universe has been set since it's beginning & matter/ energy cannot be created or destroyed, only change form from one to the other, if anyone went back in time would all of those extra molecules from the traveller suddenly entering cause some kind of catastrophic imbalance in the universe?

Why is the Master so bad and evil as with many Doctor Who villians ? The Doctor has not yet disclosed the secret of Time that affects many and probably all of us . There is a great and destructive Time Disease . The powers of Time have omitted the parts and intervals of Time that carry Love and Happiness . Do you know it ? There are Time powers working their way over all of us !!! Doctor Who and the Time Lords have to find where the missing intervals of Love hide and also find where the intervals of Hate are . As I have written many times before : Light Eclipses Time . Does Love Eclipse Hate ? Time is the difference between Day and Night . Are you on the Dark Side ? The Force be with you . Warp out ...

It seems to me that a lot of time is wasted by thinking of time as "the 4th dimension"

This leads to lots of confusion and wasted thought about time as an extension of our 3 dimensions.

If time was a direction, then it would be at right angles to our 3 dimensions, just as all 3 physical dimensions are at right angles to all the smaller dimensions before them.

Time is something else. It's not a physical dimension like the 3 physical dimensions. There's probably a 4th dimension, but it is certainly not time. Thinking of time like our 3 dimensions is a flaw. Trying to think of time travel as a 4th dimension leads nowhere. Thinking of time travel as somthing outside of our physical dimensions, however many there are, would lead to more productive theories and concepts.

Or would it?

So I'm researching for a book I want to write and I kind of had a dumb question. If the future hasn't happened yet as in no one has been in the future yet and thus no work has been done in the future, isn't the future empty? So people saying that they came from the future, a timeline in which a time machine was already created, would be false, no? Because the decisions that determine the future have not been made yet and so there is no singular continuum of time yet. Can someone answer this?

So, uh, this is kinda wild. I was just chilling, messing with a old clock, and next thing I know, I'm in some historical market, surrounded by people in weird clothes. Like, what the actual heck? I tried to low-key blend in but everyone was staring. I figured out I was in the 18th century or something. After a bunch of crazy stuff, I somehow ended up back in my room. Still no clue how that happened. Anyone else ever had a time-travel experience?

I want to write a story featuring two timelines or nations at war, but the paradoxes are insane.

Do you think involving multiple universes instead of one single timeline would work better? How would you write a time war? What can this concept be interesting to read for fiction?

I love Star Trek: Enterprise’s concept of the temporal war. But I feel it could’ve been worked on better.

Continuing down this path of researching time travel and timeline jumping will expand and rip apart your mind if you are not careful. You will get stuck in infinitely repeating infinite recursive loops that will trap you eternally if unresolved. You risk developing psychic abilities so profoundly powerful, you vomit endlessly at the sheer realization of your capabilities.

Turn back now. You are not ready to wield this power.

A tachyon is a hypothetical particle that always moves faster than light, which means they travel back in time. Every credible source I've seen says that no hard evidence for their existence has been found yet, but I have a question: how would one find a tachyon? How would one know that a particle is moving backwards in time?

while thinking "what exercise is good for time travel?", "exercise involving temporal mechanics?", and whatnot

kind of like how squats are good for the hippocampus, and motor imagery lets you think exercise; neuro, instead of tempo

i thought, what iff some combination can be used for time travel? like states in a rubiks cube, or a chess game, ramanujans' grand calculus of the infinite, or just skipping; it's possible militaries can march right into a time war, since marching can burn bridges, because you have to breakstep to resolve a temporal anomaly that warps spacetime around the rainbow bridge that time lords travel on

*edit* the title was "a working theory"

Then join . A growing community of thinkers who shape stories by just commenting. We already finished our first story, Hives In Madness (7 chapters), and just started blueprinting ideas for the next story. So act now! Chapter 1 is out but you can still contribute with chapter 2.

To be more specific, I'm talking about instances where going back in time doesn't create a new universe as thought to be the cause according to multiverse theory. Only a single timeline where the present is malleable and the future can be changed, though sometimes the timeline will try to correct itself as to avoid messing with key points in time, and people who have traveled through time retaining their memories of seemingly erased events. Back to the Future and the first 4 Terminator movies are examples of what I'm talking about.

!Remindme -4 weeks

Aside from just magic do y'all want it? It involves the physics we have in this galaxy which I'm still not sold on the earth is not flat... But I've been in airplanes and I'll compromise to those who desire this science of reality from what I've learned in this body not to be bound by anything suggestive or compromise magical thinking nor magic nor magical systems but expressing just the scientific way once it's actually discovered by someone else not IME or anyone I believe that I've "died" and been reborn, or stuck in a simulation, or any of this crazy game theories... Simply mathematical on a base 10 number system and our understanding of physics now... I don't have to make up anything it's what I learned highschool 25ish years ago... And some of that was in the Mississippi educational system... I'm sensing from those who are against me as a person or whatever that they want to destroy granted I'm medically diagnosed schizophrenic... But the really curious ones are like huh what... Well here it is the simple time machine scientific explanation and no help to design nor changing laws of physics also all magicians who own land should be restricted by now except to protect themselves their people ect... So no overpowering meteors or asteroids coming to Earth. It starts with the current educational process in which we understand through physics now that is governed by the most of all 1st world countries. Truthfully this would start a time war again if not used responsibly but... It lay in thermodynamics, entropy, and the actual expansion of the Universe. No other hints as "we as humans" can't even feed family, still fuck over friends, and all the self righteous pompous asses who haven't learned by now will figure it out or not. Curiosity didn't kill the cat it made it Beyond Mortal. I'll identify as whatever you want me to identify by NIKO got really strong I heard. Also I loved the NES game Kid Niko? Thought it was perrrfect! Oh also even this is real life and shits probably really happening... The technology the future has without compare is better than you can imagine... I'd like to say it's almost like you can chose not to be born with a disease. You know it's almost like a God was challenged by something... And the God said I'll even give you odds... You can have it all... Trust me I still win.

I mean wouldn't it make sense?

• He "Invented" the Time Machine Concept: Wells wrote The Time Machine in 1895, basically laying down the framework for how time travel is represented in modern sci-fi. Like…who just thinks of that so clearly? It’s like he knew exactly how people would want to imagine time travel and how it could realistically play out. Suspicious? I think so.
• Creepy Accurate Predictions: He predicted tech wayyy ahead of his time, like airplanes, genetic engineering, and even nuclear weapons. In The World Set Free, written in 1914, Wells described atomic bombs exploding decades before they were even invented. Um, either he was crazy smart or hiding something.
• His Obsessed With Time Travel: Besides The Time Machine, Wells wrote a LOT about futuristic tech and time manipulation. People usually write what they know, right? So what if he wasn’t just obsessed with predicting the future but actually remembering it?
• He Was “Mysteriously” Ahead of His Time: Wells was constantly writing about insane advancements that didn’t exist yet, like World Wars, space travel, and more. It's like he was pulling ideas from a future history book. Coincidence? Fishy if you ask me.
• No Known Source for His Inventions: Usually, sci-fi authors base their tech on current innovations, but Wells’ ideas just kinda…showed up. No one in the late 1800s was talking about time machines, and yet here he is, casually throwing around the idea like it’s just science in his back pocket.
• What If He WAS Warning Us? Wells wrote about dystopian futures, alien invasions, and humanity’s self-destruction. Maybe he was a time traveler who saw it all go down and tried to warn us through his work. The messages are kinda subtle, but you can read between the lines if you want.

Lately i am getting lots of dejavu feeling what are your thoughts about why we have this deja vu feeling

Okay, so first off, let me just apologize well in advance for the fact that not only is this going to be a particularly long post that deals in some rather complex topics that are, well, rather complex, even to me, but it may at times seem written by someone rather scatter-brained. I'm writing this purely off the cuff, so that's why. This will also be a post approaching time travel and the corresponding subjects in a much more scientific manner than I've seen on posts in a while.

That being said:

I'm going to be discussing both the ideas of eternalism and the Many Worlds Interpretation and how their relation with time travel, particularly to the past would actually make it more feasible and remove any worries or concerns about paradoxes or causalities. I'm fairly sure most people reading this will, on at least a rudimentary basis have an idea of both, but just in case, I'll quickly give a brief description:

Eternalism is a theory regarding the very nature of time, which states that all time, past, present and future are not only all real, but exist simultaneously. In this theory, events and moments in time are not simply fleeting, or simply disappear forever into the ether and leaving only the present, as the aptly named presentism theory posits, but actually exist in a four dimensioned spacetime. Basically, treat time similarly or identically to space, where it occupies a physical space.

In quantum mechanics, to borrow a more formal definition I have seen, the Many Worlds Interpretation is a theory or scenario that suggests all possible outcomes of quantum measurements actually occur in separate, branching universes. When such an event happens, instead of what the Copenhagen Interpretation suggests in collapsing into one, and only one outcome, the universe splits into many, many branches based on each outcome. For every choice and decision made or not made by us, doing so creates a new universe that branches off the original timeline. Meaning there would be millions; no, billions of timelines identical to our own with only small discrepancies.

Now, to tie them into time travel. Because, I am going to posit an idea that both combined present the best conditions for time travel to the past to be feasible and without any paradoxes being created.

First, let me say that time travel to the past is made much easier with either of these variables added on their own. Eternalism, with our current understanding of physics, is more or less the one way we'd be able to return to the past of our own timeline, as we wouldn't have to literally make something that no longer exists, exist once more. Like visiting a different state or country, or like a video tape, it would make it possible for us to return or access a particular past moment or year in time. It would also make navigating to it, not from a technological standpoint, but a practical point easier, as it is easier to navigate a four-dimensional space for us. Likewise, the Many Worlds Interpretation would make it easier in the manner that, even if we couldn't return to our own past exactly, we'd have the next best thing in an almost identical past. This would change the definition of time travel slightly, but almost to a negligible point.

But combined, the two concepts coexisting with one another provides, at least in my mind currently, the best chance and feasibility for time travel to the past to be possible and achievable by mankind, while alleviating any concerns about things like paradoxes being created or alterations to the timeline as we know it.

Let me explain. Both eternalism and MWI deal with the structure of reality, but from separate angles; one the physical nature of time, and the other quantum events. As frameworks, they are compatible if we consider and theorize that all points in time could contain multiple branches. Like I said, it begins to get extremely technical and complicated when you dive deep into this concept of a theory, especially when you start trying to comprehend the idea of, essentially, infinite branching timelines all existing for all of eternity in a four-dimensional space. You suddenly feel extremely small, and almost overwhelmed by the metaphorical weight of such implications.

But from a purely scientific position, both theories are based and rooted in established physics, while operating on different scales: respectively quantum mechanics and spacetime as described by general relativity. And as of now, there is no empirical data or evidence which disproves each theory individually or their potential compatibility. And that is a good thing. Which brings me back to why the two concepts coexisting brings the largest amount of feasibility to go back in time.

First, since every event and moment that has ever occured still exists as part of the spacetime fabric, it means that the simple act of traveling back to a specific point in time would not alter history, or require history to be altered; instead, to give an analogy, like a pie that has been cut up, one would be simply visiting a "slice" of reality where those moments and events happened. That removes one possible issue immediately, but what about possible paradoxes and causalities? That's where MWI pops it's head in to say hello. Because, in conjunction with eternalism, and considering that all moments are equally real and immutable with eternalism, then any actions, great or small, would not end up altering the timeline as we know it, but instead create a new branch or timeline altogether. This essentially eliminates the Bootstrap Paradox, Grandfather Paradox and all the rest in one fell swoop, and makes the fundamental act of time travel to the past much safer for the people in the original timeline.

And to finish, let me just say that while there are many critics of both theories, and likely just as many critics of the two coexisting simultaneously, there are also proponents who suggests that any challenges that this idea, this theory may present can be addressed with further understanding and theoretical development.

But there you are. From my million-mile-a-minute brain spitting it all out, to a written post. As done at the beginning, let me apologize one final time if this post seemed to jump all over the place; I was purely writing by the seat of my pants, to borrow the phrase.

If you have any thoughts on this, let me know down in the comments. Have discussions with each other about it; after all, that's the main point I'm making this in the first place, so it can be discussed. I'd like to see what others make of it, either supportively or critically. Because this is the way we slowly take baby steps towards potentially taking time travel from what is considered science fiction and outside the reach of mankind, to first feasibility, and finally reality. When I have time, I'll try and comment back to people; for now, it's extremely late at night for me, and I need to get to bed!

Have a great night, and thank you for taking the time to read this!

Strange question i know but i working on a time travel book and my protagonist (from 2066) needs to take a fly from Brazil to USA in the year of 2003. BUT i forgot about the tragics events of 09/11 until this part and if i remember well, north americans reinforce the security on airlines with very security steps after this events. This will be a dificult quest realistically?

Someone wanted me to do more of these, and i started to comment more but realized a post would be better. First 7 are from the comment.

1. Marvel, a new timeline forms, all matter in the universe doubles

2. Back to the future, time slowly corrects itself, and remnants from the future slowly fade, but have a small window to undo said changes

3. The Flash, everything changes, even things that have no connection to the time change, and they call it a time boom, and I'm sure to someone somewhere this makes sense.

4. Butterfly effect, instant change with no way to undo the change unless there is still a memory of the event written down, and sometimes there isn't, but at least he retains all memories, this is equally good and bad.

5. Timecop, similar to butterfly effect, except if you touch yourself, you melt into a weird monster that shrinks into oblivion. That's right, no self-love with this one.

6. Futurama, you retain memories. Time duplicates are eliminated as soon as the plot finds it funniest. Typically, though, you'll simply just go so far into the future that the universe restarts identically, and this 100% prevents paradoxes.

7. Dungeons and dragons, if you create a paradox, a creature named a Phane will spawn into existence with the sole purpose of killing you. This creature can be found in the epic level handbook for dnd 3.0 not 3.5

8. Star trek, this one has changed a lot over the years. They do the multiverse thing like when worf kept leaping into different dimensions or universes, but it seemed like time changes here don't create a new time line but simply change things, and time travelers retain their memory.

9. Planet of the apes, mostly causality loops, time is static and unchangeable.

10. Dr. Who, man I'm gonna get this one wrong. Most of time can be changed in small details, but pivital points in history cannot change.

11. The time machine, time cannot be intentionally changed no matter what you do. Time/the universe will do everything it takes to ensure you cannot. Because if you go back in time to alter history then you have no motive to alter history and then never do it.

12. The tick, that one cartoon episode was good. It was never confirmed if time could he changed because they stopped the villain. However they did suggest the universe would explode.

13. The time tunnel, they just do whatever they want on that old show.

14. Space 1999, time temporarily splits and changes, but reconverges and doesn't care what you do or where you are, if you aren't where you're supposed to be upon convergence, you disappear. Live channel on youtube all the time. Great show.

15. Dragon lance. Both causality loops and time can change. Caramon his brother witnessed the future and then convinced his brother raistlin to not kill the gods, they even retained an undeniable record from the diverted future.

16. Terminator, one of the most antiquated ones I've ever seen. Time can change, memories don't stay, and it just makes no sense after the second one.

17. My stories, it is called the time web and all time changes just exist within affected areas, given enough time most time changes neutral out, some don't.

18. The shadow out of time, my favorite lovecraft story, the yith project their consciousness across all of time and space within the solar system, they shape time to their whims, but are not all powerful, they have all scientific knowledge.

19. End of eternity, an organization manipulates all of time century by century, their facility is outside of time but located on earth, each floor is in charge of a different century. They micromanage all of human history. Everyone who works there comes from a time that no longer exists. They recruit volunteers prior to changing time, so if you join, you're in it for life because everything you knew is gone anyways. They didn't have a big problem with that.

20. Steve Buscemi in either 90s twilight zone or outerlimits, he keeps getting warped 10 years into the future and when he wakes up everything is 10 years older and he keeps hopping 10 years later daily. I thought it made no sense that they just plop him back when they found him at the end, but who am i to tell 4th dimensional entities how to go about doing things.

OK so pretend I'm a rich megalomaniac intent on ruling the world or living forever (there is a few out there now *cough musk *cough bezos and I'm sure plenty of others). My mission in life would be to create a light speed manned rocket, give the astronauts a mission to travel to the future, gather information and store it for me to find right now at some specific coordinates only I know. That information (potentially thousands or millions of years advanced to current day) would make me the most powerful person in the world and potentially immortal if they have found a cure to ageing in the future. Here is how i would do it:

I'd put all my money into building a rocket capable of achieving near-light speed and enabling time travel into the future, I’d need to push far beyond current propulsion and energy limits. I’d likely need an advanced propulsion system, like a fusion or antimatter engine, which could produce enough thrust to approach light speed. Antimatter propulsion, for example, combines matter with antimatter to release massive energy, theoretically allowing velocities close to the speed of light. With sufficient shielding and a reliable power source, this could create the possibility of reaching relativistic speeds and experiencing time dilation—where time slows down for those travelling near the speed of light compared to those on Earth.

Einstein’s theory of special relativity explains that as we approach the speed of light, time would slow down for us relative to people on Earth. If we could travel at 99.99% of light speed, we might age only a few years while thousands of years pass on Earth. In practice, we’d set a course to orbit Earth at these extreme speeds. As we make our way around the planet, we would experience the passage of time differently—only a short amount of time would pass for us, but the people and civilisation on Earth would advance thousands of years in what felt like a blink.

Upon returning to Earth thousands of years in the future, the astronauts would face a vastly changed planet. To communicate with me in the past, they would have to carefully plan for information storage that could withstand millennia. We might hide a cache of data, encoded in durable materials like etched silicon wafers or high-density storage media buried deep underground, where it could remain relatively protected from erosion and human interference. We’d have to leave detailed instructions on where to find this information in locations known to past civilizations—perhaps in ancient sites like pyramids or geological markers. By encoding messages in these artefacts, the time-travelling discoveries would suddenly appear in the current time for me to find. If immortality is a thing I could potentially use it on myself then ensure that information is misdirected or suppressed forever. Even if its not i would know the outcome of all future events and could enrich myself beyond all belief and position myself into power.

EDIT: Expand on sending information back - 4 theories we know of. The future will know for sure.

Sending information from the future to the past has a few hypothetical methods . Most of these rely on concepts from quantum mechanics, general relativity, or speculative physics:

1. Wormholes: Wormholes, or Einstein-Rosen bridges, are hypothetical tunnels through spacetime. If a stable, traversable wormhole existed, and one end was moved near a strong gravitational field (such as near a black hole), it would experience time differently than the other end. This difference could theoretically allow for information to be passed through one end in the future and received by the other end in the past. However, creating and stabilizing a wormhole with the right properties to safely transmit information is well beyond our current technology.
2. Quantum Entanglement and Retrocausality: Quantum mechanics introduces entanglement, where two particles are linked in such a way that the state of one instantaneously affects the state of the other, regardless of distance. Some interpretations of quantum mechanics, like the transactional interpretation, suggest that events at a quantum level might not be strictly bound by the usual cause-and-effect order. Retrocausality—a concept where an effect happens before its cause—could potentially allow particles to be influenced in the past by actions taken in the future. However, using this reliably to send information, especially complex data, would require a more profound understanding and control over quantum systems than we currently have.
3. Closed Timelike Curves (CTCs): According to general relativity, a closed timelike curve is a path in spacetime that loops back on itself, allowing something (potentially information) to return to its starting point in time. In theory, certain extreme cosmic phenomena—like rotating black holes (Kerr black holes)—might create closed timelike curves. In such a scenario, information could loop back to an earlier point in time. But again, CTCs are theoretical and require exotic matter to remain stable, which isn’t something we've observed in nature.
4. Simulated Universes and Data Transfer: Another speculative idea involves the possibility that our universe is a simulation. In a simulated reality, it’s conceivable that a future "observer" could modify the data in earlier parts of the simulation, effectively sending "information" backward. While this is a highly philosophical notion, it does represent a kind of outside-the-box approach to future-to-past communication.

What would happen to our timeline if a time traveler went back in time to change a major part of history? Would we keep living on like nothing happened or would some wacky stuff happen?