Where would you go if you had the ability to travel back in time?
@upsjetmechanic5647
2 жыл бұрын
Pangaea.
@blackmage999
2 жыл бұрын
If i could reverse entropy id id create an infinite power source.
@craigscott2315
2 жыл бұрын
a bit of a divergent, yet still within the realm of paradox. Here Mr Tyson, do you fear flat earth theory is a systemic threat to the fundamental propositions of astrophysics?
@damon81981
2 жыл бұрын
Ancient Alexandria. See the lighthouse, the library, and the culture. Time travel to the past is not possible. Its just fun to think about.
@blackmage999
2 жыл бұрын
@UCLOrDf-QvrtlfDwpSMFH17A i dont believe that time as we know it actually exists. I believe what we perceive as time is just a measurement of change within a system (entropy). The idea of traveling backwards in time would be a reversal of entropy which would have greater impacts than visiting the past.
@meisterthephilosopher6498
2 жыл бұрын
“The road you take to avoid fate, is often the one that leads you to it” … one of my favourite quotes
@miakg7571
Жыл бұрын
That Turtle from That Panda movie.
@racingfuel28
Жыл бұрын
Or as Oogway said, “one often meets his destiny on the road he takes to avoid it.”
@KingsleyIII
Жыл бұрын
That sounds like something Uncle Iroh would say in Avatar: The Last Airbender.
@carfo
Жыл бұрын
like oedipus rex
@MarioSellars-pg7rm
Жыл бұрын
“Only dead fish go with the flow” I feel is the contradictory quote to that quote lol.
@igel9316
Жыл бұрын
Everyone is so scared of changing the past a little because it would change the present, yet no one cares changing the present even though it'll change the future! 🤯
@R3_dacted0
Жыл бұрын
How can the future be changed if it wasn't set yet? For that matter, how can you be sure choice even exists in the present if you can only ever make one decision at any one point in time? If tomorrow at exactly 12:00:00 noon you are given a choice between A and B, and you pick A, how can you ever be certain that option B ever existed at all? You can never go back to 12:00:00 and select option B to check. The most you can do is go back at 12:00:01 and check... but at that point you can no longer be certain that either of those options are the same anymore. 🤔
@abenitez34
Жыл бұрын
igel..... most intelligent argument I have heard in the past 12 minutes. Bravo.
@Vioblight
Жыл бұрын
Man, the thinks I could accomplish if I read this everyday 😮😊
@balakrishnakesani4289
Жыл бұрын
We have a lot of information about past, so it makes sense to go back and use that info to our advantage, for example you failed in a test but now u know the questions so u can find answers, go back and clear it but what if you have a test tomorrow, what can u change?????
@sirdropbeartv
Жыл бұрын
The future can’t change as it hasn’t happened yet lol
@tim0n4life
2 жыл бұрын
The Netflix show “Dark” presented the best time travel story i ever saw.
@fiusionmaster3241
2 жыл бұрын
I heard it was an ok show. Is it m8? I just wandering
@CrashBashL
2 жыл бұрын
@@fiusionmaster3241 It's the best time travel series in TV history.
@MrRowntree27
2 жыл бұрын
Yes! I was thinking about that while they were talking about the inevitability stuff
@omaritojf
4 ай бұрын
Yes! Its amazing and puzzling!
@Thescrantondude
3 ай бұрын
Oh this show made my brain melt so bad
@68SSCAM
Жыл бұрын
I always thought that if you can travel back in time, you can easily prevent or change things from happening, but then that creates a parallel universe where both outcomes are possible and you stay in the one that you changed.
@dylanhughes572
Жыл бұрын
I always envisioned time travel this way.. The amount of power you'd need to time travel has got to be insane.. so I presume that such an event would pluck you completely out of the time stream and dump you at your intended location. This in turn would break causality but in essence the original you disappears and in the OG you'd be a missing person. Say you travelled back to 1899.. you would arrive and your arrival would branch the timeline. The original would still be there but from your perspective it would no longer exist. The new split would have you paradoxless.. even if you killed your great great grandparents, you would stay existing because in this time line your existence "started" when you arrived in 1899. You would be completely separate to those sort of consequences.
@alexmcneel8931
Жыл бұрын
Yes
@parttimetrader007
Жыл бұрын
The moment you travel back in your past that past become your present the one which you came from becomes the future but wait the future you will have from that moment onwards will be very much different from the future you came from .
@Wiseman108
Жыл бұрын
That just a theory as well, nobody knows for sure what would happen.
@jefftaylor3559
4 ай бұрын
What if people have traveled back in time, and the reality we see now is the result.
@collinwilson2671
Жыл бұрын
You probably hear this all the time, but… you make learning fun. Coming from someone who hates to learn after listening to you I can’t get enough of wanting to learn more about our solar system and planters and and all the wild exciting and even scariest things about our galaxy. so mesmerizing and you help make it that mesmerizing
@DSanto-bk6oq
2 жыл бұрын
That "stepping on a butterfly" story mentioned toward the end of this video came from the excellent Ray Bradbury short story "A Sound of Thunder" that was first published in the early 50's which was, in my opinion, one of the greatest sci-fi short stories every written.
@Otokichi786
2 жыл бұрын
...And a movie that was on the edge of greatness before falling into the MST3K pile: kzitem.info/news/bejne/lK6XsaqJqKCTem0
@zacherade1541
2 жыл бұрын
Came to the comments to make sure someone said the name of that story. I remember having to read that in Middle school. Great short story.
@sadeeanselment1210
Жыл бұрын
I remember reading this in jr high. It still is one of my favorite short stories ever
@woodrobin
2 жыл бұрын
The thing with "Supreme Strange," as the alternate version of Doctor Strange in "What If?" is referred to colloquially, is that he "lost his heart instead of his hands." In the main universe, he has horrible injuries to his hands in a car accident. In this alternate timeline, he convinces Christine Palmer to go to the award dinner with him (in the movie, she turns him down). Instead of the horrible hand injuries, he loses Christine in the accident. He spends his fortune researching time travel instead of experimental surgeries. He still ends up in Kamar-Taj and becomes a Master of the Mystic Arts, but he is definitely the *worst* person to entrust with the Time Stone. He goes back in time and tries to save Christine over and over, but because her death is what caused him to encounter the Time Stone in the first place, undoing her death undoes his ability to undo her death: Paradox! He finally accrues enough power to warp reality itself to his will by consuming the lives and powers of numerous extradimensional entities and even an alternate version of himself. But when he uses that power to save Christine, the laws of space and time snap under the pressure. He bent reality beyond its tensile limit. His universe, and every being in it other than himself and a small sphere he is able to preserve, dissolves into nothingness. He is (until the Watcher recruits him and brings him into the Multiverse) doomed to exist within a crystal sphere a few meters in radius, forever. His entire universe is essentially the saddest snow globe ever conceived.
@fiusionmaster3241
2 жыл бұрын
Bruh...
@aunemartinsen6905
2 жыл бұрын
Also if you could travel back in time it would mean we have no free will lol
@tenadefiant
2 жыл бұрын
Damn🤯
@Visalputh99
2 жыл бұрын
An absolute point
@woodrobin
2 жыл бұрын
@@aunemartinsen6905 If you can alter the past, it does nothing to contradict free will. In fact, it does little to contradict free will if you can't alter the past. You had free will to make the choices you made in your present. Now that that present has become the basis for events subsequent to it, you cannot alter the choices you originally freely made. In a universe where you can alter the past, free will is even stronger, in that your subjective present self can freely choose to change anything, even the actions of your subjective past self. Other people thwarting your will doesn't disprove free will in general. It just means they have an advantage over you in seeing their will implemented, whether that advantage is privilege, power, money, influence, or time travel.
@Strugglebaddy616
2 жыл бұрын
I just imagine Neil DeGrasse Tyson shaking me awake, then says "Did you know..." **cue video**
@fiusionmaster3241
2 жыл бұрын
That would be interesting
@MrLee43
2 жыл бұрын
😂
@12major18
2 жыл бұрын
I’d probably just get up and follow that n**ga 😂
@buck_maize111
2 жыл бұрын
God that made me laugh 🤣
@ponderosacal1218
2 жыл бұрын
HAHAHAHA
@NecroWolfExPaladin
Жыл бұрын
Sending messages back in time is basically the Plot of Stien's Gate. That game also deals with the concept of "attractor fields" which are macro scale events that can only be changed if you alter the past enough to escape the pull of them. It's kind of like some kind of causality gravity. Grandfather paradox only really matters in a universe with a single flow of time. In a multiverse kind of scenario you can go back in time, which will automatically create a new branching point, and anything you do creates a new branch to a new future. In that situation it becomes basically impossible for you to ever return to the universe you left. If you broke ancestry, it wouldn't matter because the reality where you didn't and were born would still exist. Nothing gets broken, you just create and follow a new time stream into a new separate universe.
@RuggedPanther
Жыл бұрын
AAAAH another steins;gate enjoyer in the wild! We're a rare breed (at least outside of the anime community).
@NecroWolfExPaladin
Жыл бұрын
@@RuggedPanther It isn't the most popular game in the world, but I loved every moment. I watched NicoB play it.
@AdityaRaj-hp8tn
Жыл бұрын
I watched the anime but all I was thinking was this was shown in Steins Gate, that's the first thing that came to mind while watching this video
@dekmikasa4366
Жыл бұрын
Finally someone mention Steins Gate. I'm not playing the game, only watch the anime. I think it's one of the most interesting take on time travel ever.
@alistairgrey5089
Жыл бұрын
I've always heard the inevitability if time described as a stream or river. The river (representing time) flows along like it's supposed to. You can interact with it in limited ways. For example, you can throw a stone into the river. This will cause ripples and a splash but the river itself will still continue on mostly unchanged. I'm not sure I agree with it but it's an interesting analogy.
@skullfracture3870
Жыл бұрын
There is a small degree of truth to this, the change you make to the river or the pond may not be immediately apparent, but there is something called the Butterfly Effect, a butterfly can flap its wings in San Francisco, and in Central Park you get rain instead of sunshine, thank you Jurassic Park. The idea is that you may not see the change that pebble makes to the river, but over hundred’s, thousands, or even millions of years that river changed its course, but we will never know if it was or was not because of that pebble you threw. Any change you make to the past can have drastic repercussions in the present. A good example of that is Back to the Future II.
@alistairgrey5089
Жыл бұрын
@@skullfracture3870 oh yeah. I agree completely. I think the idea that we can change the time we are in or the time we came from is false. I believe that if time travel is possible the moment you go back, regardless of what you do, you've already changed that timeline to one that no longer matches yours. Unless there is some way to time travel without effecting a single molecule in the past just the presence of someone will change things. The changes may be very small and have no real effect or they could be small changes that become massive changes. Am example of this actually came for a TTRPG that I once played. There was a magic that could predict probabilities to the point where a character with this ability could toss a penny out of the window and over the course of a couple days caused a nuclear war. It's an interesting concept and if someone had enough knowledge it could theoretically be done.
@dreamdjarin
2 жыл бұрын
The banana peel scenario reminded me of the star wars ep.3 scenario with Anakin when he had a dream of the future with Padme and tried hard to prevent it, going so far as to joining the dark side, but it turned out that him doing all that, was the reason why she died.
@dekmikasa4366
Жыл бұрын
Watch Steins Gate
@frocat5163
2 жыл бұрын
I agree that the more interesting approach to time travel stories is that events in the past can't be changed. Because the past has already happened, if at some future point time travel becomes possible and someone travels into the past, they were _already in the past,_ so nothing can be changed.
@Honeybee9630
2 жыл бұрын
Yeah, certainly. And they make sense in a way (not from a scientific stand point as I am pretty sure closed time loops are already disproven, are close to being disproven)
@dangernba
Жыл бұрын
Not really. Quantum physics have already predicted and proved that the observation of really small particles change their behavior even in the past. Really mind-blowing.
@rebaz7256
2 жыл бұрын
I love listening to Neil. He's a breath of fresh air
@Twilighttank
Жыл бұрын
Neil basically describing the premise of stines gate was a great addition to my day
@bakkila99
2 жыл бұрын
I like the idea that every time something changes in the timeline, it doesn’t change the future of the original timeline, it just creates a parallel branching timeline
@Andres-cd6lr
2 жыл бұрын
Did you watch Loki?
@xombi213
2 жыл бұрын
I agree. This is also a long standing theory. Multi dimensional aspects of the 4th dimension. How could you possibly change the past in the same timeline, it does not make sense as it already happened.
@hmmmmm6056
Жыл бұрын
Ok avengers
@alicedawnphelan293
2 жыл бұрын
The molecular displacement thing is possibly the closest I’ve come to explaining my reservations about time travel. Though my understanding is that it’s probably not possible to begin with.
@justtosharefiles678
2 жыл бұрын
That’s not true I made a time machine next month
@cosmicwarrior1562
2 жыл бұрын
@@justtosharefiles678 it didn’t work
@louisrobitaille5810
2 жыл бұрын
Fun fact: time travel does exist, we're all doing it right now. Time travel to the past is kinda possible, but it's impossible for anyone or anything to travel to their **own** past. Look up "cones of light" to understand why.
@jf2369af
2 жыл бұрын
I travel backwards through my time-line all the time. You ever remember your younger years? I do...
@DavidBChannel
2 жыл бұрын
Yeah, as far as I know, we don't even know if time is actually a thing or just a human concept. There might just be "now" and we may not be travelling forward through time at all.
@MD-nt9nv
2 жыл бұрын
In the movie Final Destination, I think there is the idea that even if you do somehow prevent certain events that were supposed to happen from happening, fate will eventually find you and have its way.
@shauntempley9757
2 жыл бұрын
Doctor Who said that to. It also said that if a time traveller sees his or her own grave, then either he or she will get one free trip before the events that make the grave, or a trip straight in to those events. 11's last three stories at the end of his era where all this played out.
@spellbinder3113
3 ай бұрын
Legends of Tomorrow dealt with the fact that you could change little details in history, but larger points in history were frozen and unavoidable.
@Jussomerando677
2 жыл бұрын
The “inevitable scenario.” I believe that was the main problem in butterfly effect. I wish they would’ve talked about the series “Dark”. Would love to hear how they feel about it. The ancestry paradox was crazy in there.
@Josh-Casey
2 жыл бұрын
Hi Neil! I believe, that if time travel ever is possible, it will be in a sort of "read only" mode. You would be an invisible viewer, with no ability to interact or affect anything. I suppose that's essentially what we're doing when we look up at the stars. 😀 If you instead could travel back and affect things, physics would either prevent a paradox from ever happening, as you more or less said with eventuality, or physics would just completely break down. Or, perhaps, if a paradox is created when traveling back in time, physics might only affect the traveler by instantly correcting the paradox or creating an alternative universe. Fun to think about, maddening to come up with a solution. 🤣 CHEERS! EDIT (7/15/22): People keep wanting to think of a Time Machine or Time Travel as being a more physical experience, of course how movies represent it, and I believe that the laws of physics simply will not allow any form of Time Travel to be a fully physical experience. Time Travel = Time Viewing. It will have to be some sort of virtual, or READ ONLY, experience. Something constructed out of inspecting the light, from the desired time, that has left the area of interest. Slap a telescope on Pluto, point it at Earth, record the footage, send it back to Earth, and you are now "Time Viewing" from 4.7 Hours in the past (+ another 4.7 Hours old sending back the data). If that telescope were powerful enough to record the planet in Uber Ultra MEGA HD [version 99.0], like Google Satellite view as a playable video, and you wanted to know where someone was 4 hours ago, BINGO, you can now get that info. Now push that telescope a light year away from earth, or further, and you now have the ability of Time Viewing further in the past, though no further back than when the telescope was implemented. One rebuttal was "that light has already passed that telescope by", referring to being able to go/view even further back into the past, which is an excellent point. But... Scientists don't believe you can travel faster than light, this is what people think prevents us from being able to view further back into the past in this scenario, and I agree with that speed limit. However, Scientists do believe it may be possible to travel through wormholes or bend space somehow that instantly, more or less teleports you, to other areas in the universe. You're not traveling through space, you're bending space to find a shortcut, to get around the speed limit. With the technology of traveling through wormholes, and being able to precisely inspect light from hundreds, thousands, hopefully millions of light years away, we will one day be able to inspect the light that left Earth when the City of Atlantis may have existed (12,000 light years away), when Dinosaurs roamed (66 million ly away, finally answering the question of how they died; we're pretty confident it was an asteroid impact, but what a sight that would be), or possibly even when the earth was formed (4.5 billion ly away). Even without the precise view using our "UberScope", the instant we discover wormhole, or similar, travel, we've essentially also invented "Time Viewing" just looking out a porthole. The sun may only be a spec, but that speck of light you're seeing from X light years away is from X years ago. Keep this in mind when you're doing things visible from a birds eye view! Someday one of your descendants might see you. 🤣 But, who knows, maybe there'll be another gadget that somehow detects photons through objects (a sort of X-Ray vision), then there's no escape. Granted these would have to be EXTREMELY high tech gadgets, but what's the limit to our technology? Only TIME... will tell. I think Harry Potter's trip into the Pensive is the best representation of "Time Travel/Viewing". It's nothing more than just VR experience, really, but you can see how Harry manages to view the past without affecting anything in the past (the observer effect), but with the information of the past he has the ability to change the future. CHEERS to you and thanks to everyone that's contributed below.
@JasonB808
2 жыл бұрын
You watching read only time travel right now. KZitem is a time machine, especially when the recommended algorithm shows you a vid from 10 years ago.
@1973vanguard
2 жыл бұрын
@@JasonB808 dude, good observation 👍
@pacmonkruz9846
2 жыл бұрын
I wonder if this is just death
@JasonWW2000
2 жыл бұрын
@@pacmonkruz9846 No, death is lights out.
@JasonWW2000
2 жыл бұрын
The invisible viewer theory is my idea as well. If you were to travel backwards in time it would be like your in another dimension. You can see and hear everything, but your slightly out of phase and can not interact. Of course that has its limitations like how are you breathing, hearing sound waves, etc... if your not able to interact? Still, that's the way I prefer to see it.
@toastedbread8774
2 жыл бұрын
Love you Neil! Keep up the amazing work!
@fiusionmaster3241
2 жыл бұрын
Yes
@mRendyIrawan
Жыл бұрын
I wish they would do an episode diving more into Marvel's multiverse theory which states that if you travel back in time, you're not traveling back in time, you're just creating an alternate timeline. I wonder what Neil's take would be on this theory, and how close it would be to the real thing if we ever created a way to time travel.
@noneYAbidnusORIGINAL
Жыл бұрын
"Predestination" is a sleeper time travel movie 10/10
@realbadger
2 жыл бұрын
I loved a moment in one of Isaac Asimov's novels where time agents would prevent negative events, at one point preventing a massive interplanetary war simply by _moving a bottle_ from one storage room shelf to another, causing a momentary delay. My favourite time travel novel is _The Man Who Folded Himself_ by David Gerrold, in which the first person narrator is given a Time-Belt. He learns not only how to observe history, but due to infinite timelines, he literally can "edit" events to such an extent he can forget the original. He even finds he can strangle _himself as an infant,_ and yet not vanish from existence... he'd just created a new timeline in which he'd not existed. Even your referencing Ray Bradbury's _A Sound of Thunder,_ from which we get the Butterfly Effect, the guy's mistake of falling from the designated path causing the dead butterfly demonstrates an alternate timeline.
@1973vanguard
2 жыл бұрын
Nice! Which Asimov novel is it?
@realbadger
2 жыл бұрын
@@1973vanguard _The End of Eternity_
@1973vanguard
2 жыл бұрын
@@realbadger awesome. Many thanks!
@ossiedunstan4419
2 жыл бұрын
Yes and their is a very large partition to reality from science fiction. Especially Isaac, yes i have read his books, entertaining but nothing of the scientific method , just one man's imagination, John of arc had imagination, look where it got her. Thought experiment's do not require imagination. It is constrained bye the condition of reality, Imagination is not.
@MorliHolect
2 жыл бұрын
Read the short story "All You Zombies" by Robert A. Heinlein (or watch the movie Predestination based on it). It's the ultimate time travel paradox story.
@lydiafaye494
2 жыл бұрын
Would love to hear your take on time travel creating alternate time loops, kinda like in the TV show 'Dark'. I thought that was a refreshing take on it. Or in 'Travellers' where they send consciousness back in time into the bodies of people moments before they were meant to die. Or even something like 'Interstellar' where we essentially can only be an observer and not interact/ghostly like interactions. Would love to hear these thoughts 😊
@XScorpio123X
2 жыл бұрын
I've watched both the series you mentioned and it would indeed be very interesting to hear Neil's breakdowns of those alternate forms of time travel or unraveling.
@lordnul1708
2 жыл бұрын
8:10 sometimes referred to as a "stable time loop" or "a break in rule #0 of time travel" depending on whether or not you intended to become the origin point (another example is the Song of Storms from Legend of Zelda Ocarina of Time, in which the time travel was more "sending your consciousness into the past/future" than physically traveling... And another would be the Goron Vase from Legend of Zelda Oracle of Ages, which despite being more physical here, is just as impossible as the aforementioned song).
@IRONHEAD12701
Жыл бұрын
Chuck Nice makes this video so much better. Great comic ❤️🤙🏻
@louistrinnaman7344
2 жыл бұрын
Pretty sure in H.G Wells book the answer to why he couldn't save her was that his grief from her death is what motivated him to build the time machine so if he saved her he would not had made the machine hence he couldn't go back in time to save her. Meaning he created his own paradox in that moment that it forces the timeline to always flow in that direction in order for him to build his time machine. I find time travel to be a fascinating concept but to ensure you can't mess with the timeliness I would love to build a Tachyon Telescope and Binoculars giving us a window to look into the past and observe our history unfold. That would be amazing.
@ClarkKent2011
4 ай бұрын
Small correction: The "trying to save his fiancée Emma" happens only in the 2002 movie. Not in the original book, nor the 1960 movie. With everything else, I think, yopu are completely right.
@driftwood9705
Жыл бұрын
Actually in “ The time machine” The head of the Morlocks, which is the old wise being Explains to the professor the reason his fiancé kept dying is because he would’ve never spent the rest of his time and drive building the time machine had she not died so the fact that he has the time machine and keeps trying to save her he cannot.
@Philzney
2 жыл бұрын
The tachyon enhanced smartphone and banana peel message alert that Neil talked about perfectly describes the plot of Stein's Gate, a very popular sci-fi anime series. The plot is about changing word lines and also employs the idea of minor changes and their effects on inevitable events in the timeline that Neil also mentioned
@draroking
2 жыл бұрын
EL PSY CONGROO
@arsal.07
2 жыл бұрын
EL PSY CONGROO
@JimNicholls
2 жыл бұрын
Another time travel paradox: All the atoms in your body were somewhere else before they were in you. Tomorrow there will be some new ones, and some of the old ones will be gone, there is constant change. Travel far enough back in time, to before you were conceived, and every one of those atoms will be somewhere else. Since atoms cannot be in two places at once, even travelling back a week or a month will mean some parts of your body fading away, and the further you go the less of you will remain, until you're completely gone. Exactly the same applies to the machine you travel in - just a short time earlier, all of its atoms would be still be in minerals in the ground or whatever. I'm not buying a ticket for that!
@erick_falker
2 жыл бұрын
That's why whenever I open I time travel portal, I send a drone with a camera first. LOL
@TheCosmicGuy0111
2 жыл бұрын
String theory
@brianstrutter1501
2 жыл бұрын
That makes no sense
@forthenight3265
Жыл бұрын
Working on a story featuring time travel. So glad one of the greatest minds of our time can break it down this simply
@theicephoenix
2 жыл бұрын
You incredibly described how premonitions work with the taquion device LOL
@WilliamBrownMBA
3 ай бұрын
Okay, so you and Kyle Hill have talked about World Cones, and the explanation seems to suggest that all past and future events conspire to bring you to the present moment. So, if we go back in time and change things, would the concept of world cones be a self correcting mechanism for such an event?
@johnduffy62164
3 ай бұрын
Would to see Kyle do a show with Neil !
@AAristi1976
2 жыл бұрын
About the concept NDT mentions at 5:00, I think the Series "Outlander" plays with this pretty well. Great series with an interesting take on time traveling.
@suonoblu6650
2 жыл бұрын
If we consider travel back in time as possible, then Novikov's principle of self-consistency would be the only solution to the grandfather paradox to have a logical coherence, as the multiverse-based solution generates grandfather paradoxes in turn.
@Dizma_Music
Жыл бұрын
05:30 - Tyson mentions that it would be cool for there to be a fiction regarding time travel where big events can't be changed. There's a Twilight Zone audio drama episode where someone tries to go back to stop the assassination of Lincoln and the major event cannot be changed, just the small details.
@MostHighEmperorPalpatine
2 жыл бұрын
I love when Neil suddenly starts laughing for no reason 🙃🙂
@carbonscythe
Жыл бұрын
So with the ancestor paradox, do you have to be more and more careful the further back in time you go? Because your small change affect one person, and that person affect every person they interact with and so on, a temporal domino effect.
@jcIIXVIIIVII
2 жыл бұрын
Since no one has actually invented time travel, as we've seen depicted in film and shows, we really DON'T know exactly how it would work...BUT I've always been intrigued by the, what you now termed, Ancestral Paradox lol But my REAL question is about branched timeline time travel, like the one discussed in Avengers: Endgame, and the show Loki, where you go back in time, but instead of affecting the past of the future you came from, you, instead, create an alternative timeline that deviates from the one you came from, however, the events that happened in your original timeline still happen the same way. Do you think that THAT type of time travel is possible? Where going back in time doesn't change anything in your timeline, but creates an alternative one instead. That could technically and effectively get around the whole Ancestral Paradox
@royalecrafts6252
2 жыл бұрын
Since we dont know for sure, we cannot even know if such paradoxes will unfold in the case of time travel, maybe no paradox at all happens
@maraudershields283
2 жыл бұрын
You should look up Minute Physics and their time travel video. They explore all the different ‘rules’ presented in different movies, and the logics behind them. Interesting stuff.
@ФилипВасилевски
2 жыл бұрын
@@royalecrafts6252 no paradox at all? U think this is possible?
@royalecrafts6252
2 жыл бұрын
@@ФилипВасилевски yes, we cannot really assume anything since we barely know anything about time, so yeah I think is possible for the universe to not have time paradoxes
@ФилипВасилевски
2 жыл бұрын
@@royalecrafts6252 giving me hope thank u
@JoseSanchez-sh5ic
2 жыл бұрын
So “what if” we are already in a paradox, having someone from the future come back to the past to “prevent” a global catastrophe, thus preventing us from advancing as a civilization?
@ManDinqa
Ай бұрын
Chuck Nice always cracks Neal up.
@RoyThe4th
5 ай бұрын
I think the 2 timelines would just merge. While your grandfather would cease to exist, you would still exist.
@RPIdemon
4 ай бұрын
Aside from forgetting the name Back To The Future, Chuck was on point with the jokes and the pop culture references. I thought of the What If? episode with Doctor Strange too
@RLomoterenge
2 жыл бұрын
I would love to see a serious Terminator movie where they try to scientifically try to foil the future from happening using crazy antics like introducing Sara Conner to Chuck or having the terminator learn some exceptional coffee making skills and get a job at a coffee shop where Sara and Kyle are gonna be right before they conceive just so they can order a second cup. That’d be hilarious!
@ronkempke6673
3 ай бұрын
If I'm not mistaken, Star Trek's, "The Guardian of Forever" episode addresses this.
@killjoydklown
2 жыл бұрын
A Sound of thunder. 2005 film about a futuristic time safari where, in a trip to the past, a butterfly is stepped on by accident, causing a ripple effect in time. Great film.
@thetotalwarrior
Жыл бұрын
At about 5:01 Neil talks about the idea that maybe the forces of nature care about major events in spite of you changing minor events and says it would make a cool Sci-fi movie. This was done in the T.V show Lost. In that show at least one person goes back in time and tries to change the course of events leading to a life changing incident and no matter what he does "time has a way of correcting the course"
@incognito3620
Жыл бұрын
I have never had so much fun watching a science video. You guys make science fun.GREAT!
@Thumbs1101
4 ай бұрын
I’d love to hear him discuss the Hyperion series
@csabafacsar5562
Ай бұрын
I love these two!!! They are so goooood together !!! :)
@lumina1104
2 ай бұрын
@StarTalk I'm surprised you didn't touch on the interpretation that suggests that when a quantum particle interacts with another, the universal wave function splits into multiple sections, with each section containing a different possible outcome. Going back and changing something wouldn't necessarily lead to the paradox where you'd be prevented from ever going back. The different outcomes could lead to different branes in the bulk.
@makinawake9178
2 жыл бұрын
Wow I never felt like I know Tyson really appreciated this video 👍
@RobertCLudwig
Жыл бұрын
A similar short story from a long time ago involved scientists that had two spheres the collided together but as they bounced apart the spheres traveled in time - one forward, one back. The sphere that traveled back in time caused the death of various minor creatures in the distant past that changed the course of evolution. When the spheres finally came to a halt and the experiment was over, the scientists commented that, "see, nothing happened." However they were no longer the humans that began the experiment but a totally different species.
@kn1ghtRipper7
Жыл бұрын
Chuck mentioning "What If?" Super! 😊
@skullfracture3870
Жыл бұрын
Sometimes, I think of the C&E Paradox (cause and effect), where the Effect actually happens before the Cause. The age old question: what came first, the chicken or the egg? A perfect example is The Terminator. In the movie John Conner, Skynet, and the Terminators already exist in Kyle Reese’s reality, but essentially they are the effect and the cause at the same time. Skynet sends a Terminator to 1984 to prevent the birth of John Conner, who in the future miraculously knows how to fight the machines. In the process of sending the Terminator back in time Skynet actually set that future in motion, ensuring both the birth of John Conner and it’s own creation.
@daveross7731
Жыл бұрын
"Inevitability. you change a few small things but the Inevitable will still happen." The first movie I thought of was Deja Vu, with Denzel Washington, Paula Patton, Bruce Greenwood and Val Kilmer. Denzel's partner is killed by the ferry bomb supposedly. When Denzel's character pushes a note back in time with the help of scientists with nuclear accelerator to his partner, his partner investigates the mysterious anonymous note. His partner goes to the dock to check out the lead, he unwittingly meets the bomber. Bomber murders the DEA agent in cold blood. So the agent still ended up dead just in a different river of time, as they had called it in the movie
@CultureIsKey
2 жыл бұрын
We need to understand the deeper underlyings of this paradox. The two begin to discuss it towards the end of their discussion, my favorite example being the one when the text message. The anime Steins;Gate has journeyed into this aspect of time travel. And also, the inevitability of constantly causing the outcome in which you are trying to prevent. So bravo to you two for talking about time travel in this sense, I really enjoy the idea of it. I imagine at times my thoughts today are able to be pulled from the future up to the boundary of infinity, sometimes I wonder if it can go beyond the boundary. Anyway, if that’s the case, it does feel like there’s some time confederation suppressing these ideas. My favorite easily testable example is. Learning about Physics to try to counteract nuclear warfare. The learning of Physics LEADING to nuclear warfare. You two should do a review on SpinLaunch by the way I’m not sure that you have. It’s an interesting concept.
@slowpoke101_
Жыл бұрын
I wish they knew of that anime...
@CultureIsKey
Жыл бұрын
@@slowpoke101_ They need to watch it!!!
@slowpoke101_
Жыл бұрын
@@CultureIsKey I don't know man they don't strike me as the anime type
@sleter2414
10 ай бұрын
Here's my thought on travelling back in time: The very act of being present in the past, causes so many changes that it ultimately leads to the person not existing or having travelled back in time. For example, if I invented a way to time travel and appeared just 5 seconds before, my very appearance to my 5-second-ago self would have resulted in him being unable to start the time travel experiment exactly on the dot. Which then means that I never travelled back 5 seconds ago, ultimately causing me repeat the time travel experiment on the dot again. Which would mean that at that precise moment I triggered the experiment, I am simultaneously not there (cuz I travelled back in time) and still there (cuz I created a condition that prevented me from travelling back in time)
@flurng
2 жыл бұрын
Going back to the banana peel scenario, we can't ignore the "oscillation effect" - this is where you successfully prevent your friend from slipping, but since he never slips, you don't bother sending the text, therefore he gets no warning and he DOES slip, so you DO send the text, and on & on & on.....
@pagefault404
Жыл бұрын
Prime Video - The History of Time Travel. It's a documentary that talks about the discovery of time travel, however the viewers are the observers of the ramifications of the actions made because of time travel, and the documentary changes in gradually less subtle ways until the end. It perfectly shows the grandfather paradox in action.
@justraf5868
2 жыл бұрын
that scenario about sending a text message back in time definitely talks about that anime, I forgot the title
@Aerie925
2 жыл бұрын
While the Disney show That’s So Raven wasn’t about time travel, but the titular character’s ability to see the future-whenever the character has a vision, everything she does to prevent the vision from happening inevitably causes the vision to happen-similar to the time travel paradox(es) you’re taking about.
@michaelccopelandsr7120
2 жыл бұрын
My idea so I get to name it! Voyager 1 is now in interstellar time or "Mikey's Time." Think of it like Alvin and the chipmunks. "Vyger's" message is fine. It's just sped up now that it's outside our suns time bubble or "Terran Time." It would be faster still if "Vyger" sent a message from beyond the Milky Way's time bubble. (That name is still up for grabs.) Outside the Local Group time bubble, so on and so on until we get to the, "True Interstellar Time Standard." Now that "Vyger" is in interstellar space, it's also in the Milky Way's STANDARD, faster moving, interstellar time or "Mikey's Time." •Our sun's time bubble: "Terran Time" we know and have measured. •Milky Way's time bubble or "Mikey's Time." The rate/flow of TIME outside any influence but within the Milky Way: We just got there and are still figuring. Wild guess I'd say time will increase in speed, now and until Vyger is outside the Ort cloud .007-.07% faster, maybe. Just for reference. •Local Group's time bubble or the rate/flow of time outside of any influence but within the Local Group: Name still open and unknown. Wild guess .08% to a couple seconds faster, maybe. Used just for reference. •Outside any influence in the, "True Interstellar Time Standard," or...;-P Name NOT up for grabs BUT just begging to be measured. The rate/flow of time is fastest here so, surfing time here is choice. Though it's best to have your motor boat. ;-P A minute is a minute in all. It's the rate/flow I'm talking about. The Milky Way's Interstellar Time Standard will be known as, "Mikey's Time." Pass it on, please and thank you.
@rtyuik7
7 ай бұрын
also, at around 10:59 - i gotta admit, in my experience, the tone used for that singular "...Chuck?" is almost always followed by 'its time to Pass the Pipe' xD
@darkpilsen
2 жыл бұрын
I think Dr. Tyson may have been talking about the movie "About time" which is amazing.
@comradepickles7607
2 жыл бұрын
"A Sound of Thunder" by Ray Bradbury is the story Neil mentioned at the end. A short story about time travel and "The Butterfly Effect" and it's basically the exact story Chuck described.
@thapureheart
Жыл бұрын
" Make the train come a little later " is just perfect in that context 😂😂
@MondoLeStraka
Жыл бұрын
Great as usual. As mentioned in another thread, could you please do a video on pseudoparticles? TIA.
@iampoch01
2 жыл бұрын
The Tachyon smartphone texting sounds like the premise of the excellent anime movie Your Name.
@lordchaos52
Жыл бұрын
my issue with time travel is due to the particles in the universe. right now no matter what arrangements of particles there are we have all of them here right now. if you go back in time you introduce duplicates of them particles. would that break the universe due to having additional particles. would that throw an imbalance into the universe having too many of the same ones there? its like overfilling a bucket of water. if you add more will it overflow or burst the container
@o.g.awe3785
2 жыл бұрын
Guys, the concept of the forces of time caring about major events was actually explored in a book series several decades ago. The Dragonlance series. Specifically the Legends trilogy which includes Time of the Twins, War of the Twins and Test of the twins. What is discussed is that time is a river and you disturbing the timeline is on as a pebble being thrown in. You create ripples but time flies on. The main character discovers that when he kills the evil mage in the past that tries to take his body for his own in the present, that he only takes his place and is stuck in the evil mages path through history.
@TheEternalPheonix
2 жыл бұрын
I’m partial to the alternate future version of time travel. It makes the most sense to me.
@jordanjackson9341
Жыл бұрын
Question: If three people are stuck in a three day time loop? Person 1 relives the same 24 time period Person 2 relives the same 48 time period Person 3 relives the same 72 time period How many types of paradoxes would that create? Especially if it's not linear?
@waleedarda
Жыл бұрын
In my opinion, going back in time would be a travel in a video replay of actions but not real events. In fact we live in past time relative to the Sun, however we’re just observing that past time without the ability to intervene in changing any incident because it already has happened
@ncl1701
9 күн бұрын
So by going back in time, you would affect the molecules around you by just being there changing the timeline?
@somata123
2 жыл бұрын
Here in this discussion of tachyon text message there is a challenge "I feel there is time estimation as when he sees that time coincides with exactly when he steps which determines speed or rate of tachyon particle as we now know the time." Is it possible if he receives message before he steps....then what ?
@KeljuIvan
Жыл бұрын
I can't remember the name of the book, but in it there was a time cop organization, which aimed to change the past through the minimum possible action. They wanted to prevent interstellar travel from being developed.
@omarzed6043
2 жыл бұрын
Actually in min 08:00 with the banana peel.. it reminds me of the Oracle from Matrix when Neo met her, she said "don't worry about the vase.". Neo turns around to see which vase and breaks the vase anway
@lawnmowergirl
2 жыл бұрын
@5:30 he is taliking about fixed points in time, so important to the natural flow that they can not be changed.
@robertperry4618
Жыл бұрын
My finite grasp of reasoning/logic leads me to believe timeline alteration is not achievable, not due to some fantastic idea of destiny, rather the fact that once you make the modification to the past you infact remove the present/future you's motivation for going back into the past to alter the present timeline to begin with...
@o.g.awe3785
2 жыл бұрын
That story Neil mentions is by Ray Bradbury and it’s called A sound of Thunder.
@stevenkobb156
2 жыл бұрын
I agree with Neil's inevitability concept. All of the scenarios ask can you or can you not change your past, whether its killing your dad or stepping on a butterfly. If there is only one timeline, it's not a question of changing the past. If you had the ability, anything you tried would simply be something that already did happen in the past. It's just that you would be participating in a non-linear order of events. If, however, there are infinite multiple universes, with a new universe budding off for every variation of events, then you could go back and make any changes you like; changes wouldn't affect your starting timeline, but your subjective self would have shifted to this new timeline. So if you killed your own father, then went "back" to the future, you would find that the you in this timeline ( the timeline that branched off when your father was shot) indeed had never been born. So the you that appears, would have started in his original timeline, left it to travel to his past, killed his dad to create the new timeline where he'd never been born, then travelled to the new timeline's future, where he would find no record of himself. He would be alone, jobless, and homeless. Also, Neil mentioned time stopping for objects at light speed. I believe that curve is asymptotic, so you theoretically might approach light speed but never reach it. So time would get slower and slower but never stop. Or am I wrong?
@dralin350
2 жыл бұрын
Love it. I have so many time-travel models and theories. Alternative mechanics to predestination and ripple effects. The multi-timeline is a great one, but there are scenarios that break that in some interesting ways.
@DrMario-su6xj
Жыл бұрын
Nearly everyone knows this paradox but if it's Neil and Chuck it's worth having a revision.
@Aaron_Scissorhands
Жыл бұрын
What he says ahout the banana peel/text message brings to light something that i have wondered for years. With all of the technology that we have with computers, smart phones, and what-not, while humans cant travel back in time, why can't we figure out how to text back in time? Or even call someone on the phone back in time? There HAS to be a way to do that. Right?
@CasZeal
Жыл бұрын
An explanation to the grandfather paradox is that Time Travelers are also sliders, moving between and creating alternate timelines.
@Mr23markm
4 ай бұрын
The story Neil mentioned with the butterfly sounds like The Sound of Thunder, a short story by Ray Bradbury.
@357malcolm
4 ай бұрын
Also the movie “frequency” explores the tachyon theory
@ArmughanJalil
Жыл бұрын
What about Futurama where Fry travels back in time and mates with his grandmother thus becoming his own grandfather? Which paradox is that?
@malachiXX
2 жыл бұрын
Hi Neil, There is a fantaxtic novel (not too well known) by Orson Scott Card called "Pastwatch, The Redemption of Christopher Columbus", where they possess the technology to view the past events in real tme. They open a window into the past and attempt to learn from the events of the past. But then something happens..... I highly recommend it as it is a real treat where they do their best to avoid paradox and they don't make the most common mistake in Hollywood where they think they are not part of the timestream (ergo they think they are doing this because it is their own idea) The movie MIllenium had a very similar scene where one of the main characters (Daniel J Travanti) gives a speech about possible time travellers and how they would not want to be found.
@LouJP
Жыл бұрын
i love these but the audio quality needs to be improved a bit. Every time Neil talks i have to turn my headphones up and when the other dude talks i have to quickly turn it down before my ear drums get blasted
@crwydryny
2 жыл бұрын
The thing with terminator, skynet isn't preventing Connors birth but ensuring it's own birth as it was created from technology salvaged from that first terminator, killing Sarah Connor would have been a nice bonus, but it timed it so that the terminator would arrive at a time where it's technology could be studied and built on. Any earlier and it would have been too advanced so left and forgotten, any later and it would have been too late to be built
@Bluesrains
Жыл бұрын
I GO FORWARD IN TIME EVERY 1,000 YEARS FOR ALL ETERNITY!!!
@nikolatesla2076
2 жыл бұрын
listening to you guys talk about time travel is amazing . im pretty sure you have not seen ( Dark ) it is amazing and the best time travel movie .
@ClnJack
Жыл бұрын
I'd love to see Neil review Tenet very briefly.
@neilbrisley713
Жыл бұрын
Think of this. When you go back in time, you are still going forward in your own time.
@hariboddeeti
Жыл бұрын
Science is fun to learn with Neil DeGrasse Tyson
@mrfrecklestein3194
Жыл бұрын
What about the opposite side of this paradox explored in the episode in futurama where fry sleeps with his own grandmother becoming his own grandfather
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