Physicist Brian Greene Breaks Down Famous Time Travel Movies
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- เผยแพร่เมื่อ 4 มิ.ย. 2024
- Theoretical Physicist, String Theorist and Professor, Brian Greene looks at how time travel is portrayed in popular films. You can get his new book, Until the End of Time, here: amzn.to/3pTGyVx
Until the End of Time is Brian Greene's breathtaking new exploration of the cosmos and our quest to understand it. Greene takes us on a journey across time, from our most refined understanding of the universe's beginning, to the closest science can take us to the very end. He explores how life and mind emerged from the initial chaos, and how our minds, in coming to understand their own impermanence, seek in different ways to give meaning to experience: in story, myth, religion, creative expression, science, the quest for truth, and our longing for the timeless, or eternal. Through a series of nested stories that explain distinct but interwoven layers of reality-from the quantum mechanics to consciousness to black holes-Greene provides us with a clearer sense of how we came to be, a finer picture of where we are now, and a firmer understanding of where we are headed.
Yet all this understanding, which arose with the emergence of life, will dissolve with its conclusion. Which leaves us with one realisation: during our brief moment in the sun, we are tasked with the charge of finding our own meaning. Let us embark.
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Brian, as someone who struggles a lot with learning, you have no idea how grateful I am of you. You give me hope that I can tackle the challenge of me learning. You make me less embarrassed about my level of intelligence. Thank you.
That's cool. It's really a matter of how YOU learn. We all learn at different "speeds". Some people understand concepts quicker than some, other people understand slower and need to have things explained differently. That is the main problem teachers have. They have a classroom filled with people who all learn things differently, and at different speeds. You are limited by the amount of time that you can spend working with those people that understand things differently. Teachers also have to be able to spot when and where they "lose" someone, where someone stops being able to understand the concept being taught and move forward. Remote learning is difficult for some, but I love it. You can start and stop and learn at your pace.
Struggling with learning does NOT mean you're not intelligent. Learning and thinking are two completely separate things. Don't be embarrassed or look down on yourself. You're way more intelligent than you think. You said it yourself: You want to learn. That is a sign of intelligence in itself. Dumb people are the ones who want to stay ignorant.
@Davy Anthonissen Wow! THUMBS! Don't forget about your thumbs! You have thumbs! Thumbs make life alot easier. You took care of emotional intelligence, all I got left is thumbs.
Curiosity will always outpace quick learning in the human race. The fact that you're even watching these videos is grand.
If you're curious, you're living. If you're living, you're good.
@@jacklambert1521 well said.
Brian Greene is an amazing physicist. I could listen to him all day!
to be honest, i dont know how amazing Brian Greene is as a physicist, but i do know he is an amazing science educator. :)
One of the things that never ceases to blow me away about Brian Greene is how fast he thinks. The man can talk for hours about deep and complex topics without a single "um" or "uh". Try it yourself. Sit down in front of a camera and see how long you can go without saying "um". It's hard. But not for Brian Greene. Always a pleasure listening to him talk!
The interesting thing about traveling through time is that not only would you end up at a different time, but a completely different location in space relative to the motion of the planets and stars. Let's say that you made a time travel device on earth where you step in and out on the same location on earth, you would have to account for the position that the exit point is in relative to the entrance. Even 1 year will most likely land you in the middle of space if you went in at one point and exited at that same point.
Yeah, I think about this all the time when thinking about time travel and was expecting him to talk about it.
At the very least, you should attempt it with arm floaties on, in case you end up in a body of water.
No, that assumes you have a reference frame that is not locked to the movement of the Earth but rather the movement of the Milky Way's center, or another astral body.
There is just no objective concept of "the same point" without a reference frame. The best you can do is find "the point with the same coordinates in that specific reference frame", and in that case, it makes sense to choose the terrestrial reference frame, since it is the most convenient, or more logically, choose the reference frame of the time machine.
In that case, you don't end up in space, though it does beg the question of what happens to the reference frame if the landmarks you use or the components of the time machine are dispersed as you travel back in the past.
The scariest thing about Interstellar is the person who was left on the water planet assumed dead. If he did die, technically he could have been minutes away from hundreds of years of rescue effort.
I always assumed that the Flux Capacitor in BTTF was the thing that prevented events in the past from having an immediate impact. Flux means change and in electronics a capacitor is a temporary store, so the Flux Capacitor temporarily stores the changes to give the time traveller chance to correct their course.
Thats really cool! I assumed Hollywood chose two random science words and stuck them together without any thought whatsoever. It would be impressive if they did came up with the flux capacitor as you say.
I am absolutely certain you gave more thought to those two words than Zimeckis and Gale did to the entire script.
@@creative-renaissance they did; the OP is retro-defining the terms and it's tenuous bollocks
What "Back to the Future", "The Time Machine" and other movies get wrong is if you try to go back in time and are on the earth you will not end up in the same place on earth. The earth is not where it was 10 minutes ago, it has rotated, it has revolved around the sun, and the sun has moved around the Milky Way. Try to go back 100 years and you're going to find yourself out in empty space. If you went to a far away star (thousands of light years) at near the speed of light and then wanted to return you would have to allow for the solar system revolving around the Milky Way. It would not be in the same location it was when you left it.
Every subatomic particle (wave) and the space between them will have expanded at your destination, as well. Physical time-travel requires compensation for both locational change due to movement but also for dimensional change due to universal expansion. That 1st one is simple enough math, no harder than a ship or a plane plotting a course on a spinning sphere. Solving for the second requires something as yet unknown, like a particle suspended in a red solution.
There is a book that tackles this issue, albeit rather strangely, called "Ghost" by Piers Anthony. In it, the characters use a time vessel to travel, not just through time, but through space. When the ship travels in time, it stays in the same physical location while the Universe continues to move. In this way, they DO travel through space...or rather, space travels around them.
I remember in the 70's a comic that came out called "2000 AD". Judge Dredd featured in it. Another character that feature in this comic magazine was a character called "Strontium Dog" whom if I remember correctly was some sort of mercenary. Now this character has a weapon called a "time grenade" a particularly nasty weapon that when it exploded it would take everything within a certain radius of itself back in time by an hour or so .... but as the planet earth had moved the victim was effectively transported in outer space.
@@callmepotato Just because "there is a book", while it may be the basis of a good story, it in no way means it has any bearing on reality.
@@SykoticBanana He was a bounty hunter. He and his partner would occasionally use carefully calibrated time bombs as a means of escape, sometimes appearing in mid air and saying things like "the calculations were off!". Dredd also used a time machine to travel forwards in time in the "City of the Damned" storyline. At the end, they change the timeline and prevent a future disaster from happening, but the effects that have already happened (future Dredd's body is brought back to the present, Anderson gets a scar on her leg, Dredd loses his eyes and has bionics implanted) stay in place. This is queried, and the only answer given is that they don't know.
Arrival is a great movie and for me it's about the primacy of consciousness, and that by changing our consciousness we have the capacity to liberate us from what feels like hard limitations of linear time and material reality, as it's an effect of our consciousness not what causes our consciousness.
Hope he'll do an episode about Futurama with the same topic. They did a number of takes on time travel including a time machine that only goes forward in time and suggests that time is a cycle that ends with the decay of the last particle and reignites with another big bang creating an identical universe where the same effects occur (the entire history of time is pre-determined). The also did a number of time travels to the past where events in the past were revealed to have always been meant to happen and shape the present, like Fry accidentally becoming his own grandfather. They had a number of writers with advanced science degrees, so it's not total mumbo jumbo like Back to the Future...
There was a story in Stargate SG1 called ‘A Matter of Time’ that involved a black hole and the effects of its extreme gravity..with the associated time distortion effects. The entire series is also based on the use of wormholes. Enjoyable Sci-fi 👍🏼
Yes, I was thinking that as well. In the eyes of SGC they were basically "stuck" there.
Yes but Sam says in this that the gravity effect coming through the wormhole is completely in violation with general relativity. And it is. Dr Becky (an english astrophysicist) reviewed that episode on her youtube page)
@@birgitmelchior8248 Link please.
I really enjoy listening to Brian Greene. Like no other scientific communicator.
I love the concept of moments being the atoms of time. Brian and Michio are exceptionally skilled at relaying information to laymen. Their books read like stories, which makes learning much easier.
That was absolutely fascinating and explained a lot in a way even I could understand. Great video, thanks!
Thank you Brian! You’re very interesting, eloquent and well spoken. You’re also easy to follow and as a scientist, you sure know how to define things in such a simplistic way. Thank you for all your teachings and also for this marvelous presentation. Johnny, Montréal, Canada 🇨🇦
Brian is such an inspiration. An amazing human being.
the Statue of liberty scene is and was still mind blowing
I always took the Back to the Future pictures fading thing to mean that the more events that transpired differently than the way they really did the odds or likelihood of them being born were continuously decreasing but not yet impossible which is why they had not blinked out of existence entirely
The chances of the exact same sperm fertilizing the exact same ova at the exact same moment are so remote that even the slightest change in circumstances between the two parents would mean the chances of your birth would be, to all extents and purposes, zero.
We are all, already, traveling forward in time. Accelerating that is quite conceivable.
Traveling back in time is a whole 'nother matter. As far as we know, time is a bell that cannot be un-rung.
"You can change whatever you want, but is a good idea to know how these ideas actually work". There's a saying in writing that goes "know the actual rules before you butcher them". Basically what he said. Its best to know how things actually work before you change them to suit your needs, that way you can keep at least a semi-coherent thought process.
Thats the main reason I watch these: so I know the basic ideas of how things work. And I've come up with a few ideas for my own writing. Partly from hawking and Einstein, but largely from Brian Greene here.
The Spanish film Timecrimes is an underappreciated gem of the time travel genre.
The thing I love about Physics is that it doesn't hesitate to ask serious and complicated questions.
I appreciate how easy it is for them to say “I don’t know” or “We don’t know”. Instead of acting like they know everything.
I've seen the folded paper in so many movies but I usually see them folding it then the punching a pencil through both sides.
This is already a very deep subject matter, but that ending man.... deep and honestly a perfect way to end this! Like icing on a cake or the strawberry added on top! Time is so precious to us bc the simple fact it is so mysterious. Awesome video!
So when he mentioned that moments in time just are, it got me thinking about Futurama, and how fry became his own grandpa. He never became his own grandpa. How things "became" is how they always were. You cannot change the past because whatever you do to change it is how things were always meant to play out. Interesting to consider that an animated comedy series could be more accurate than what many consider to be "plausibly accurate" sci-fi.
This has given me an all new perspective on Peggy Sue Got Married. The end of that movie may have gotten more right than I realized as a kid.
Good stuff, though the fact that Greene isn't a biologist was illustrated when he definitively stated that most animals experience the world moment-to-moment - that they aren't able to mentally time travel. Maybe true if you define "most animals" as "most species in kingdom Animalia". I suspect, though, that _most vertebrates_ (along with some mollusks, and possibly other invertebrates) possess some degree of episodic memory, and can make decisions with reference to it.
Mental time-travel into the _future,_ rather than just the past, might be a lot more limited (e.g. corvids, elephants, and great apes), but it's possible that, say, _all_ mammal species (and additional birds like parrots) have such an ability. We probably need better-designed experiments to prove this, though, and need to avoid limiting them to a tool-use paradigm like variations of Tulving's "spoon test".
Animals see the future all the time. When they're hungry they look for locations that are likely to have food, when the sun begins to set they look for safe places to rest. Past experiences give us future expectations, such as we expect the ground will hold us when we stand on it.
Their brains might be smaller, but its the same model. All the same features to varying effectiveness.
@@aristideslourdas8478 I guess the argument would be that some or all of those instances are demonstrating simple operant conditioning, rather than actual mental time-travel. I suspect that's hogwash, though.
One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with. There is also no problem about changing the course of history- the course of history does not change because it all fits together like a jigsaw. All the important changes have happened before the things they were supposed to change and it all sorts itself out in the end.
The major problem is quite simply one of grammar, and the main work to consult in this matter is Dr Dan Streetmentioner's Time Traveller's Handbook of 1001 Tense Formations. It will tell you for instance how to describe something that was about to happen to you in the past before you avoided it by time-jumping forward two days in order to avoid it. The event will be described differently according to whether you are talking about it from the standpoint of your own natural time, from a time in the further future, or a time in the further past and is further complicated by the possibility of conducting conversations whilst you are actually travelling from one time to another with the intention of becoming your own father or mother.
Just the thought of Time Travel is absolutely fascinating
I agree with the "It's a black and white thing," but I like how they did it in the film, because Marty's existence in reality and in the photograph were a reflection of the probably that he would be born. A faded Marty was a probable but not guaranteed Marty, affected in real time by the choices of his future parents. A fun idea!
But if Marty ceased to exist, he couldn't go back in time and separate his parents, thereby reaffirming his existence. So there is no scenario in which Marty will not exist, because his parents will get together whether he goes back in time or not.
Yes. Like Schrodinger's cat. Marty both existed and didn't exist.
Thank you! What a lovely breakfast I had this time with you and all those thoughts.
Love it, thank you detailing your perspective.
I'd like to see your ideas on Twelve Monkeys. In the movie and the TV series, the characters did things that could have changed history, but the results of their actions were always what they remembered as having happened. There were no transitions, no memories of another timeline. It sounds like what you describe as the way time travel would work.
I recommend watching a series of short films called "calls". It's on apple TV. It's a similar idea to the movie "frequency". In "calls" something weird starts happening with mobile phone signals. It becomes possible to make calls to the past or future. People start giving information to people in the past, to prevent accidents or just change things. It causes all kinds of problems. The films are all audio with weird graphics. You don't see any actors. It's all voice acting. I really enjoyed it.
Is that 3 feet of snow piled up against his windows?? Good lord. That place looks like heaven.
21:40 is where it really hits. A lesson to us all.
I never thought of language in that sense. Considering my love for words, I'm grateful for that new perspective. Thank you.
It's the way he articulates things that does it for me
In BttF I assumed Marty 'fading out' was to do with the probability of him being born decreasing rather than it taking time for things to ripple through time.
Great video. Obviously, one could talk about this for hours. (I'd love to hear your take on the movies "Primer," "Timecrimes," and "Slaughterhouse Five".)
Primer deserves to be talked about, it's such a great movie
I like to think slaughter house five isn't time travel. It feels like it's about ptsd to me and the time travelling is flash backs and all the wierd space zoo stuff (its been years since i read it) is actually a coping mechanism/fantasy world.
In the movie Event Horizon, from 1997, a character played by Sam Neill already described the wormhole tunnel with a piece of paper like this.
It was described with a piece of paper like this in the children's book A Wrinkle in Time written in 1962 as well
That was absolutely beautiful what he said at the end.
This is why I like agents of shield. They has time travel and it was always immutable time. Everything was solidly built without paradox that I can recall. Good narrative.
Perhaps you could add TIMELINE to a future edition:
“While excavating a site in France, Professor Johnston finds some discrepancies and travels to USA to consult with his sponsor. Shortly his team members find his bifocals and a note begging for help; both of which date back to fourteenth century. When contacted, the sponsor tells them that to find Johnson they too must travel back in time. All but one agree.”
Great film despite its problems.
Thanks for your vid. Explains the issues in an understandable way.
Thanks. I'm glad I took the *_time_* to watch this video. tavi.
Brian is awesome TED talks all of it dumbing it down for us thank you
This is all fantastic, as is the view from his drawing room window!
Predestination is one of the craziest time travel movies ever.
Its not about time travel...
Thank you very much.
I love this - thanks for the upload!
I’d be curious to get your thoughts on the series continuum. Great segment BTW.
Super cool.
Thank you BG!
I love Frequency. Thanks for your service on it!
Wish could have also added the Netflix series 'DARK' in this 😅 I know it's a series n not a movie but still 😅
An absolutely incredible series though! :D
@@lenaak4806 Absolute proof that Mr. Frank DiMeglio is the greatest scientist/physicist who has ever lived:
Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. ELECTROMAGNETISM/energy is gravity. This is proven by F=ma AND E=mc2. This NECESSARILY represents, INVOLVES, AND describes what is possible/potential AND actual (IN BALANCE). So, gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; as gravity is ELECTROMAGNETISM/energy. Therefore, invisible AND visible SPACE in FUNDAMENTAL equilibrium AND balance IS the MIDDLE DISTANCE in/of space consistent WITH/AS what is fundamentally balanced GRAVITATIONAL/ELECTROMAGNETIC force/energy; as ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, inertia/INERTIAL RESISTANCE is proportional to (or balanced with/as) GRAVITATIONAL force/energy; as this balances AND unifies ELECTROMAGNETISM/energy AND gravity; as this balances gravity AND inertia. (This explains F=ma AND E=mc2, as ELECTROMAGNETISM/energy is gravity.) ACCORDINGLY, gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; as ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!! A PHOTON may be placed at the center of the Sun (as a point, of course), as the reduction of SPACE is offset by (or BALANCED with) the speed of light; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. (The stars AND PLANETS are POINTS in the night sky.) "Mass"/energy involves balanced inertia/INERTIAL RESISTANCE consistent WITH/AS what is BALANCED ELECTROMAGNETIC/GRAVITATIONAL force/energy, as ELECTROMAGNETISM/ENERGY IS GRAVITY. E=mc2 IS F=ma. So, time DILATION ULTIMATELY proves that electromagnetism/energy is gravity. BALANCE and completeness go hand in hand. Gravity IS ELECTROMAGNETISM/energy. INSTANTANEITY is thus FUNDAMENTAL to what is the FULL and proper understanding of physics/physical experience.
BALANCE and completeness go hand in hand. E=mc2 IS F=ma. Gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites, AS ELECTROMAGNETISM/energy is gravity. Great. Touch AND feeling BLEND, as GRAVITY AND ELECTROMAGNETISM/ENERGY are linked AND balanced; as gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; as ELECTROMAGNETISM/ENERGY IS GRAVITY; AS E=mc2 IS F=ma. Gravity AND ELECTROMAGNETISM/energy are linked AND balanced IN AND OUT of SPACE AND TIME, as gravity is electromagnetism/energy. E=mc2 IS F=ma. This is entirely proven by the mathematical unification of Maxwell's equations AND Einstein's equations (given the addition of a fourth spatial dimension). Indeed, this explains why Einstein's equations predict that SPACE is either expanding or contracting. Moreover, this is why Einstein's equations allow for (or predict) "black holes". Balance and completeness go hand in hand. Einstein's equations are NECESSARILY ELECTROMAGNETIC/GRAVITATIONAL. Notice the term c4. GREAT !!! ELECTROMAGNETISM/ENERGY IS GRAVITY. This is proven by F=ma AND E=mc2. I have provided top down, true, and overwhelming mathematical proof AS WELL that gravity IS ELECTROMAGNETISM/energy. So, It is now abundantly and quite clear that Einstein never nearly understood gravity AND physics/physical experience. (Obviously, E=mc2 is DIRECTLY and fundamentally derived from F=ma.) Sir Isaac Newton now ranks second.
Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.
In fact, the ROTATION of the moon does MATCH it's REVOLUTION. ACCORDINGLY, gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; as gravity IS ELECTROMAGNETISM/energy. SO, a given planet sweeps out equal areas in equal times; AND this is THEN consistent WITH F=ma, E=mc2, AND what is perpetual motion; as ELECTROMAGNETISM/energy is gravity. Therefore, GRAVITATIONAL force/energy is proportional to (or balanced with/as) inertia/INERTIAL RESISTANCE; as gravity is electromagnetism/energy. So, "mass"/energy involves balanced inertia/inertial resistance consistent WITH what is BALANCED ELECTROMAGNETIC/GRAVITATIONAL force/energy; as ELECTROMAGNETISM/ENERGY IS GRAVITY. It ALL makes perfect sense. E=mc2 IS F=ma. The stars AND PLANETS are POINTS in the night sky. ("Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/energy is gravity. E=mc2 IS F=ma.) It ALL CLEARLY makes perfect sense. Objects fall at the SAME RATE (neglecting air resistance, of course), AS ELECTROMAGNETISM/energy is gravity. Gravity IS ELECTROMAGNETISM/energy. BALANCE and completeness go hand in hand. E=mc2 IS F=ma. Gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites, AS ELECTROMAGNETISM/energy is gravity. Great.
By Frank DiMeglio
@@frankdimeglio8216 so should I watch it?
A very interesting presentation, Dr. Greene. Perhaps you can someday find the time to analyze another set of movies.
I have never enjoyed being so confused before. Thank you.
so cool to see him just talk and the conversation flows, but he's still weaving in explanations for the theories behind this stuff.
More, please! Have him do TV next. I liked Brian.
such a great video but how come such little views
Dr Greene,
Mesmerising, sir!
How close you are to the timeless truth.
I know I'm late but please do an episode like this again with Professor Greene on TENET. Please... We deserve it. Please...
this channel is a hidden gem
Love this! Also love your views as people think I'm weird for not believing in the possibility for time travel....
Amazing video. Thank you! Subded
"don't have to time travel naked."
T-800: Why didn't you say so sooner?
Another time travel movie that people don't talk about enough is Predestination! Love that movie
When Dr. Green discusses the idea of travel to the past, any modifications then would result in future events always incorporating that interaction. What is, always was.
And the scene that I am thinking of that illustrates this is the final portion of Bill and Ted are battling Chuck De Nomolos towards the end of Bogus Journey.
Also, I would have liked to hear Dr. Green‘s take on the ending of Contact.
11:26 Man I would've too, nothing to be ashamed of, that would be a rather unsettling feeling.
I like the way Heinlein approached the subject of "changing the past"... You just create a parallel alternate timeline that progresses theoretically from the moment you arrive (I'm including some Chaos Theory in my hypothesis). As soon as you appear on the planet you would change the balance, mass, and so many other things that the cumulative impact of your very existence on the new timeline would change things in a radical fashion. Heinlein treats time as just another Dimension... actually 3 more dimensions to correlate with the 3 spatial dimensions. Ever read any of his Multiverse novels? :)
I've been traveling through time for my entire lifetime. However, I only travel into the future and I only do so at a rate of one second per second.
Wow, that's some high frequency, how do you do it?
In Africa they do so at the pace of one minute every 60 seconds.
There is a episode of Doctor Who where he and Donna Noble land in Pompeii on the day before it erupts and he finds out that he was the cause of the eruption. If he was not there it would not have erupted but as it did, he always had to be there.
The way I visualize it, time is universal. It progresses the same no matter where you are located in the universe. The image we see from any object out in space, regardless whether by naked eye or a scope is light that emanated from that object in the past. In other words, we can't see the object as it is in the present.
I want to think that when mcfly creates the paradox, he does begin to fade from existence. As soon as the initial separation from history occurs, he "blinks" out of existing. As he doesn't exist anymore, he no longer changed the past. That blinks him back into existence. He remains in a state of existing and not existing oscillating at at rate that reflects the probability of events leading to his existence. The further the timeline is from an outcome where his parents create him, the more he "doesn't exist." Culminating in the probability that he doesn't interact with the strings of the guitar.
I know there are more holes still exposed by this angle, but I like it and it's how I suspend my disbelief while watching.
If any of you are intrigued by the description of the film The Time Traveler's Wife, I urge you to pick up the novel. I really liked the film -- even if, IIRC, it left out the last scene in the novel, which was the scene that first popped into the author's mind and caused her to flesh out the novel. But I loved the novel -- although it includes the "naked time travel" trope that Prof. Greene isn't wild about.
Fantastic video
wow. Brian Greene is AMAZING
So interesting, all of it! I have so many questions! BUT, you look much better in real life than your older face in the movie!
You're the man!
Would of loved them to ask him about Primer! from what i understand that is the best time travel movie scientifically sounding like the most possible
Read your book Until the End of Time. Love it ; except, I have not been sleeping to well since. It just keeps me thinking of things that I wouldn't have considered before. New Perpectives! I love your take on nature and the way you express it. FANTASTIC STUFF Brian Green.
Brian's rants about how changes in a timeline wouldn't be gradually noticeable to a time traveler made me feel so validated. Any time I watch a piece of media where changing the past is a plot point, I'm always immediately confused because- like he said- that would just be the way that events in the past happened, so the person from the future shouldn't have any memories of it being any other way.
Though, his descriptions of what actually feasible time travel would look like makes me curious what the point of this time travel would actually be, since the people not time traveling would have to wait many years to collect the resulting data and the time traveler would be leaving behind everyone they know forever and wouldn't be able to relay anything they learned back to the people in their original life (so, I guess they would need to be really confident that a) they know exactly how many years they're going to skip and b) that there are still people waiting on the other side to collect data from them.) I guess that's where the realm of fiction steps in- to explore the human implications of these kinds of ideas.
A great one too is the episode "blink in time" on Star Trek Voyager 👽🤘
Love this guy...
I think it's much simpler. It's never going to be a paradox. Time moves at the speed of light. That's why time stops if you travel at the speed of light. Even if you survive the round trip back to kill your grandfather and came back, the timeline you killed your grandfather is moving into its future at the same speed that your timeline you came back to is, and the two will never intercept. Wait 50 years and go back to that time line, you'll see you don't exist there and you had created an alternate timeline. If we ever discover anti graviton, the best we could do is visit either the past or the alternate timelines we have created
The game Final Fantasy X was the first interaction that peaked my interest. The connection between gravity and time. Yet the dissociation of space and time.
I think the grandfather paradox wouldnt really effect you, because the moment you travelled back in time, you are desynchronized from causality, nothing from the new "past" will effect YOU but if you stick around you would not be born in the new causality. So essentially you become an entity that popped into existance from a now purely theoretical timeline. you go back to your time, and you never existed. But thats a lot of effort to go through to get rid of your internet browser history.
Having dreams that coincidentally seem to play out the next day seems related to what he was talking about in the movie Arrival. I wonder if anyone else experiences this.
I do, all the time. Is this a brain trick, fifth-dimensional stuff or precognition? Weirdly, Brian Greene and most physicists would rather accept a fifth-dimensional explanation and be horrified by precognition, because physics deals with all sorts of bizarre shit but is still kind of terrified of the idea of anything that implies nonlocal consciousness.
Hi, I've heard the expression of " Time slows down when hittng the speed of light ".
I know it is impossible but what happens when you do the exact opposite of slowing the speed of light and speed up time?
I loved your input in a documentary I watched years ago about string theory. The way Brian explained being locked in time sounds like he is making the case for fate, whereby nothing we can do will change the outcome of our life which is predetermined. Maybe fate is determined at a higher level of reality but at the level we experience it, via our life on this planet, it gives the illusion of free will and choice?
I have travelled into the past to see your home surrounded by snow! - And all I had to do was push a play button! :)
5:53 Interesting comment. I too watched the original "Planet of The Apes" as a child (around six years of age), but I had been to a museum several times by then, so I already understood that if things had changed drastically 'since the past up to the present', then nothing was ever 'unchanging' or certain. The scene still had an impact on me (upsetting me greatly) considering that of all the possibilities that could happen in the future, destruction of all that which was familiar as a result of wanton violence was deeply lamentable, whether in historical reality or in fiction.
Whenever there are two movies by the same name, I get the feeling that "the original (________)" and "the good (________)" always refer to the same movie. With songs, it's more like 95%, but with movies, I couldn't name a single exception.
@@achtsekundenfurz7876 Agreed! With song 'covers' sometimes, there's a pertinent nuance that the inspired singer brings forth with greater (albeit subtle) tonality and cadence, drawing attention to aspects that are essential to initial appreciation, or else which may have been overlooked in their original expression, but filmatically, it does seem to be a different matter. :)
And THEN there are others who don't even try (esp. with music) and just use the name of a good song. Every singer just has to have a song called "Always" or "Everybody" no matter how bad they are...
@@achtsekundenfurz7876 By odd coincidence, I just happened to come across 22 well established composers (Beethoven, Tchaikovsky, Chopin, Brahms, Gorecki... to name a few) who all have a piece of work referred to as: "Opus 36".
Sharing a name is hardly a modern conundrum, is it..? :D
I really enjoyed this. I just want to point out that, technically, every tunnel is a tunnel from one moment in time to another..
One of the best Time Travels I know is from an Anime called Zetsuen no Tempest, despite all its flaws, the Timetraveling in it is amazingly done
on the topic of Marty McFly starting to "fade away", I've always thought of it as the "Quantum Probabilities" becoming lower and lower ... it's like, 10 minutes ago, there was still a "Good Chance" his parents would get together ... now ... there's a 50/50 chance ... So, like the location of an Electron is really a "Probability Cloud", Marty's *Existence* is similarly a "Probability" that might go one way or the other ... and he doesn't turn solid until the probability becomes favorable again.
I would have really liked to hear his explanation of Primer
Very good! He's the best!
We are time traveling right now. 60 seconds per minute, 60 minutes per hour, etc. This is the best way to understand it.
The most bizarre thing about back to the future's depiction of the timeline changing is the fact that the photo remained.. like, who took a picture of an empty yard.. and how did that photo end up with non-existent marty?
Do you know the book "Timeline" by Michael Crichton? It has a very interesting take on time travel as well, though I have to admit at some point I did not get it anymore. Especially (also thinking about some of the examples in that video), how can they travel around in the time? I get how you can theoretically travel to the future, but how can they come back to their own original timeline :-)
You can't imagine how shocking it was back in the day to know they were actually on Earth all along in the original Planet of the Apes.....That shit stayed with you for days. lol.
Lol and now it’s used as the cover of the vhs or dvd smh
nicely done. wish he'd covered Predestination - the ultimate timeloop movie, or maybe The Butterfly Effect