Neil deGrasse Tyson Explains the Space-time Continuum

What are the consequences of playing with the SPACE-TIME CONTINUUM? On this explainer, Neil deGrasse Tyson and comic co-host Chuck Nice break down the space-time continuum in real life and in pop culture.
Find out about Einstein's special theory of relativity and our four dimensions. Neil and Chuck make lunch plans as they navigate space and time. What critiques does Neil have of The Terminator and Back to the Future? What are some unintended complications of time travel? Discover the concept of worldliness, getting unstuck from time in Slaughterhouse 5, and how time travel is just a changing of dimensions.
About the prints that flank Neil in this video:
"Black Swan” & "White Swan" limited edition serigraph prints by Coast Salish artist Jane Kwatleematt Marston. For more information about this artist and her work, visit Inuit Gallery of Vancouver. inuit.com/
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About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!
#StarTalk #NeildeGrasseTyson

[@DCul]

Neil: I'll meet you at 12 noon tomorrow. Chuck: When? Neil: I JUST SAID WHEN.

[@taleimoce973]

You saw that too huh

[@DarthKamui]

🤣That got me shook a bit.

[@brooksbohmbach1]

Morning hangery with a dash of ego

[@kjmdrumz3]

@@brooksbohmbach1 A dash?

[@chrlpolk]

When you have a loose script and your partner loses his place! 😂

[@danbrownlee4400]

Check out the movie Adjustment Bureau. It shows peoples "World Lines" as you discuss them. It is very interesting from that perspective.

[@thomasruwart1722]

That is a great movie! Now I need to go watch it again. Or, go back in time and just watch it the first time all over again. I am soooo confused😈

[@MrLee43]

@@thomasruwart1722 you mean go back in "space time" and watch it lol

[@josemendez3269]

Search: Neil deGrasse Tyson meets Post Malone It’s hilarious!

[@annedrieck7316]

Time variant authorities

[@musingsbymarco5001]

I've seen it in many forms in lots of movies, shows, anime before (hopefully drawing inspiration from the science) but I never heard it refer to a specific person before, it was some amount of divergence crossing over a shared timeline for everyone and all their interactions, and then maybe a new world line would be created, a parallel universe or multiverse type of theory.

[@marcosassis0]

Chuck is why I see these videos. Besides being so fun, his insights are intelligent and his excitement about learning is inspiring.

[@williamvanderscheer4327]

It also helps he actually doesn't know too much (or acts well like he doesn't) so he basically acts as a proxy for the viewer, a great dynamic.

[@marcosassis0]

@Sidique Geloo Why not?

[@urharrisonmiller]

Agreed...

[@chrlpolk]

I see Chuck “learn” things he’s learned in past vids. He knows more than he lets on, he’s clearly there to be the comic relief but after watching awhile he’s clearly more knowledgeable than he lets on.

[@donaldcarpenter5328]

Yeah, Chuck brings it. Neil & Chuck work very well together, they MESH

[@100DollarBillYall]

4:27 Neil sounded a little angry there, made me sit up straight lol

[@jamesb1856]

He does that when he gets excited

[@hristoitchov]

@cops and govern ment are gangstalkers Google is your friend, dear flat earther. There are plenty of discoveries, observations, experiments, that answer all those questions of yours. You don't have to believe it blindly, just go and do them yourself.

[@tdward23]

@𝚄.𝚂. 𝙶𝚘𝚟𝚎𝚛𝚗𝚖𝚎𝚗𝚝 𝚍𝚒𝚍 𝟿/𝟷𝟷 it's been proven. All of it. You, surprisingly, presented all the numbers. You must know it's all true. So, what is wrong with you. It's on you to now prove it's NOT true. You haven't been in orbit so who has come back to earth and NOT said the earth was round. Who has real math that does NOT say the earth is round. There are no questions here, so no need to reply with any response that is NOT fact based.

[@RockChalk263]

@Allah is Satan(Saturn); Mahomet=Baphomet heh. It's fascinating observing an idiot in their natural environment.

[@christian_aspen]

Chuck is basically the perfect cohost for this. His commentary and engagement keep us audience with the conversation

[@jamesb1856]

You guys are magical together. Been a fan of Neil's for years, but Chuck takes it up a notch.

[@Blair3567]

Chuck spoils every podcast

[@FedePerusset]

"we didn't think this through Marty!" lol

[@SJG4789]

Oh Marty I miscalculated 😂😂😂

[@AtheistExpert]

he sent his dog first in the movie ;)

[@RichyJFilms]

GIGAWAT

[@anonymou5spaz940]

I immediately thought morty from Rick and morty

[@danbreeden5481]

Good one

[@dancingdazetz]

This is probably my favourite episode so far, not just for the concepts but also for the fact that Chuck was at his absolute best here! Kudos!

[@jsmithers.]

Pissy boy

[@thebeast5215]

@@jsmithers. what

[@jsmithers.]

@@thebeast5215 What don't you understand..?

[@desireer6915]

Thank you so much for these Star Talk videos! These are AMAZING! I LOVE them, I've learned so much already! 😄

[@ThePriestofYahuahYahushah]

I counted the moons and logged them for two years. We were lied to. There are 355 days in a year. Here is a video showing you how you can go verify it yourself. Just skip to the moon information kzbin.info/www/bejne/Z2mYpJyCmLuHpas

[@LloydGM]

Perhaps you already knew it further along in your world line and are just now recognizing it back in your world line today. So you really didn't learn anything because you already know it.

[@victorrutledge257]

When i first tried to understand Space/Time, I learned the word inexplicable. I was all of twelve, and the math left me breathless. I realize your explanation of it is much easier to grasp, but the problem is that I had this secondary problem of wondering how we can observe these four dimensions, if we are "inside" them. I mean, if you are in a two dimensional space, you can't see in three dimensions, and if you are in a three dimensional space, you can't see in four dimensions. We can, in effect, "See" all four dimensions around us. Does that put us in five dimensions? A kid could develop a complex trying to resolve this. For "Back to the Future", a little knowledge is just that. The protagonist only knew that he wanted to change the smallest amount of history. For the Arnold franchise, with Terminators, they were unable to hypothesize concerning history, they could only look m In the subject of "World Lines" let's get crazier. Dr Who had the entire "World Line" depicted, and how it was multi-faceted and curved in ways that you could not even see. "Timey-Wimey, and expressions even less scientific, were used to explain how time and history can change, even though time might not 'move'. Points which could not change, without altering the future, did exist, but were not every moment. In my Science Fiction Multiverse, Every action has an equal and simultaneous explosion of results. If you get up from your chair, it's one universe, and if you don't, BANG! another Universe arises.

[@shakir1ali]

I am so jealous of Chuck... Got the best gig ever... Free knowledge from a great teacher while having no exam pressure and also being super funny...

[@trentstafford1019]

agreed!

[@srirangdhawale5242]

Interstellar portrays this PERFECTLY. He even elegantly saw the ‘Spaghetti’ as straight lines..

[@thomasruwart1722]

Another great movie that I now have to watch again. Or, as I mentioned in a reply to another comment, go back in time and watch it the first time all over again...😈

[@ejmtv3]

I think Kip Thorne has a contribution to that specific scene as well

[@thecoach301]

And Neil actually did the voice over for cinemasins about it

[@_JudgeDredd]

We live in a twilight world 👉🤲👏👐👈

[@Zeguine1]

I was thinking the same. Best movie!

[@Blate1]

Even if you went back in time on an anniversary, you’d still end up in outer space cuz the sun is flying around the galaxy and the galaxy is flying in some direction through space.

[@egggarnishaustin5559]

I literally just replied with this then I seen your comment

[@hondo190]

Exactly my thoughts. But what would happen if you stand still in space? Would the fact that the universe is expanding also change your postion?

[@egggarnishaustin5559]

@@hondo190 you would just be rocketing off the planet Earth is going a shitload fast

[@jn651]

Glad I read this before I said the same thing.

[@kosdas]

@@hondo190 Sure, you are right. Groups of galaxies are moving away from each other, together with the space that contains them, because new space is added in the huge empty space between them, with a speed higher than the speed of light. So, if the space coordinates are relative to some point in our cluster, then you are moving even if you stay still. But if for some reason the expansion does not affect the spacetime continuum, (as for example the new space added finds itself "outside" of the currently existing system of reference"), then the space coordinates are relative to a point closer to you, inside your own local group, and the displacement in space is not happening if you stay still in relationship to that point.

[@Sol-fu4nm]

This is exactly the explanation I needed. I clicked on this video because its a simple fact that Neil Tyson is the best person in the world at explaining things.

[@thechosenone8523]

Chuck and Neil are the person I need in my life for fun and knowledge.

[@Synster73]

The proper phrasing for Doc Brown after realizing he's forgot about the 4th dimension would be,,,,"Great Scott, Marty!"

[@jsmithers.]

He never forgot about the 4th dimension. He accounted for the time difference. Just not the spatial difference within the universe.

[@rob5232]

I love theses two gentlemen, I learn and laugh. Stay safe all ..from the UK

[@jacquesmesrine9427]

Great video. I love the explanations of Neil deGrasse Tyson. Big fan of him.

[@sharad1878]

Neil. I’ve seen your previous takes on interstellar ending and why Matthew Doesn’t age.. … but why won’t his cells or tissues age? Thanks.

[@jacquesmesrine9427]

@@sharad1878 i also find that a difficult question. But I do believe that aging stops while reaching the speed of light. I believe that because at the large hydron collider at cern they shoot particles at nearly the speed of light. Those particles decay. But when the are going at nearly the speed of light they decay 30 times slower. Because that is proven I believe aging stops at the speed of light. But why that happens? That’s a great but hard question.

[@MarkSashegyi]

McConaughey's character in True Detective briefly described what Neil does at the end, when he mentions time is processed linearly to us, but would appear as a flat circle to higher dimensional being unconstrained by our 3 spatial dimensions.

[@Xephon64]

hey Neal, would the relative position of the solar system play any part of the space time coordinates? after all the Sun is moving as it pulls the solar system with it, as well the milky way is in turn also moving. would this motion affect the world line?

[@thaliapanacea964]

Earth, the Sun, the Solar System--nothing is ever REALLY in the same place twice. Even our yearly trip around the Sun doesn't put the Earth back where it was last year because while the galaxy is spinning AND moving in one direction, the universe is also expanding. All objects in space are moving. It would be practically impossible to go back to where Earth was at a past point in time if we really break it down and look at the truth of it, because every time machine would by necessity be a Spacetime Machine, and it would have to travel back in time AND SPACE to where Earth was at a given time in the past. We can't calculate that exactly because since no point in space is ever stationary and everything is moving (that's relativity) there is literally no fixed point in space that remains stationary. We only know where things are in relation to other things. Making calculations would therefore be impossibly imprecise. We could make some good, close approximations and then go looking for past Earth because our Spacetime Machine must have a propulsion system, an artificial atmosphere like any spaceship would need to sustain us in space, and ALSO be able to move back and forth through time. I doubt even our best and brightest humans could pull that off for hundreds or thousands of years without significant advancements in physics and a few hundred quantum computers. Maybe someday, but it seems too complicated for us right now. Of course, these UAPs (UFOs) may not be "aliens." They could be humans from our future who are watching their ancient ancestors.

[@cranjismcbasketball2118]

I could listen to these guys all day!

[@dsmgrilli8923]

One of my favorite movies that explains a version of time travel is called Millennium (1989). Its a sci-fi movie with Kris Kristofferson in it. Not very well know but decent for its time.

[@LittleMacscorner]

I never heard of Worldlines either. PLEASE do an entire special episode on them!!! You can put all the ads in it you want and I won't say anything!

[@jackmortimer329]

The spatial aspect of time travel in movies and literature has always bothered me for exactly what you point out in this video. Thanks for bringing this detail to light.

[@ThePriestofYahuahYahushah]

I counted the moons and logged them for two years. We were lied to. There are 355 days in a year. Here is a video showing you how you can go verify it yourself. Just skip to the moon information kzbin.info/www/bejne/Z2mYpJyCmLuHpas

[@Squeesher]

Donnie Darko had a simple visual of world lines extending from people, strange movie but I love it anyway :)

[@DampeS8N]

Yep, was gonna say exactly this.

[@mandreadfg]

Bruh yes thanks

[@danielvermeer3363]

I like when he is seeing his counsellor haha

[@jammyd6656]

kzbin.info/www/bejne/pJK5p5uHjc97o68

[@Eternal_Genin]

Facts

[@Dj_Nizzo]

Except the “World Line” is only relative to the sun, which is spinning around the Milky Way, which is rotating and expanding with the entirety of the universe. And who knows if our universe is one of billions rotating and expanding throughout the multiverse. I don’t think we will ever be advanced enough to target a specific “location” since, locations are so theoretical and relative.

[@KawaiChan.]

I was thinking the same thing. Fairly impossible to calculate the exact point you want to be traveling back in time. Well maybe not but to actually be at the point is a task and a half

[@adithyaramesh5634]

Everything is relative

[@no-shot773]

😁 Stargate did time travel with a set Sun position and Star Burst AND 4 dimesioal Calcs. (They had three Astro Physics guys helping in the theory of it all) Just putting that out there.

[@petersage5157]

@@no-shot773 Maybe in later episodes, but they first did it with just Sam and some hypotheticals from George. The handwaves in "1969" are completely implausible.

[@kundakaps]

The world line isn't relative to the sun. (the sun is spinning around the centre of the milky way, which itself is moving in space). The whole spacetime is a block. The expanding spacetime doesn't change this. Since we know how fast we are moving & how fast spacetime is expanding, we can calculate the previous position.

[@YakiDamingo]

As I look at this it just played into real life and brought clarity of real life usage 🙌 (ps just watched your other hajacking the 4th dimension video on this subject ❤️) it's night time in a Dallas and I was getting out of my truck and I thought if I change my speed of going into my house I can avoid the collision of a robber or dangerous situation 😱basically Life safety 🙌 I'm very grateful to have found your content and to be receiving the clarity of life that I have been.

[@leafyrox]

I just rewatched back to the future and t2 last weekend. Now I have to re-rewatch them...

[@DR-MCK4YS-GAMING]

it's funny I had a discussion with someone the other day about this exact thing to do with time travel where you need a space time travel machine not just a time machine due to the motion of space he did not understand so thanks for explaining here I can now show them this great video

[@rahulswami2749]

I want to be as excited about my life as NGT is about science.

[@SJG4789]

Need to talk bud?

[@chrono8233]

~You can do it.

[@kimberlyharvey8947]

Do what you love

[@KDM5037]

@@kimberlyharvey8947 ive been asking that question for 33 years, still dont know

[@user-ob5wl2bz3i]

Greetings from Greece,loved the alphabet video.So theoretical speaking and taking into consideration what you said about the movement of planet etc trying to time travel forward in time would be as tricky as going back;

[@anoniemuss824]

I wonder if quantum entanglement could somehow help with time travel, like can things be entangled not just through space but through time as well? If so, maybe we could communicate with the past or future.

[@NineAtoms1]

With the Back to the Future reference, our solar system is also orbiting the center of our galaxy. Therefore, earth wouldn't be in the same location at any point in 1955 when compared to 1985.

[@stevo5976]

Isn't interstellar the movie in a higher dimensions looking "down"?

[@peerlessportraits]

Yes. And that’s why there will never be a sequel.

[@thecoach301]

And Neil actually did the voice over for cinemasins about it

[@Fbbblzcoconut]

@@peerlessportraits that is such subtle but absolutely true statement.

[@domscape970]

Love listening to the shows. One thought, you said to time travel you would have to do it on the exact anniversary of when that place lined up or you maybe in the vacuum of space. Since not only are the Earths rotation and solar rotation, but the galactic rotation and spacial expansion to be accounted for it’s the location you are in this second the only time you or anyone will ever actually be there?

[@StaticYonder]

I think it all assumes that the time machine is tied to the location by gravity, which would make a lot of sense based on how gravity bends space time

[@derangius]

Chuck's job as a comedian here must be freakin hard! Guy has to transition between serious and not with Dr.Tyson and his mind blowing facts. Guy is tragically underrated

[@n_ceur]

Such a good duo.

[@yeshwanthmv7879]

I think we can call what Cooper from the movie interstellar saw in the black hole was his world line. And was interacting with it using gravity.

[@Zeuskabob1]

Donnie Darko portrayed a world line in the movie, but only for the main character. It showed his movement through space as a manifold opening up in front of him, where he would move next.

[@chaves88rlz]

Glad more people remembered that scene

[@erikhendrickson59]

Just some light morning listening contemplating the universe itself~

[@briangill23]

I love you both, thank you for the laughs and knowledge!

[@bobbyt223]

I’ve always thought the same thing as far as going back in town and making sure you go to where earth was at that very time! That would be the hardest part of time travel I think

[@projectlifedog1459]

Start of every startalk explaining video: Neil: This is Startalk Chuck: heeEEYY

[@shivampatel4595]

For the Marty movie, if Marty uses his machine to travel back in time to the same location, then the coordinates were probably set to the exact location he was at. If there was no concept of the coordinates, then we can assume that time traveling at a certain location will land you in that same location in the selecting time. If that's the case, then we can assume that earth will be in its original (orginal equaling the location the earth was at in the previous (selected) time) location, in the original rotation, etc.

[@xEricC1001x]

I think Adjustment Bureau did a great job with World Lines. There are a few places in the movie where the timeline enforcer group agents open a magical book that shows the protagonist's current x&y position in New York with a line of his history. They then overlay a path of someone they don't want him to ever meet and the premise is those World Lines can never cross.

[@mennobot3884]

Neil, I recommend you watch the Netflix series Dark. It gets the time travel exactly right, everything has been thought of

[@ajaved1037]

I think Neil would love to watch "Steins Gate"

[@DiablitoKawaii]

Or DETROIT METAL CITY

[@johnnavarro9095]

When he said world line I knew then and there he wouldn't enjoy Stiens gate 1 bit lol

[@Jonathan-he4jp]

Exactly what i thought when he said that he hasn’t heard of any media that explored the world line concept lol. Steins gate has the best use of time travel in fiction IMO

[@reddwarfhead]

Bitdefender sponsoring you?! awesome!

[@MCConfuz]

7:40 actually a great Doc impression!

[@FakingANerve]

Yes! It made up for his terrible Arnold impression. 😊

[@alexandermartin1837]

Great video. Are you planning to collaborate with The Exoplanets Channel?

[@egggarnishaustin5559]

You sorta forgot you wouldn't be able to do it on an anniversary as the sun is moving through the Milky Way

[@nielzdg]

And the milky way is moving through the universe

[@pedrocenteio4822]

Exactly. Even if you spend your entire life in one place, stationary on the earth surface, you will never be twice in the same place. The earth doesn't move in "circles" be in a spiral, along with the Sun's movement.

[@jamesb1856]

Theoretically making it impossible. You'll never be in the same point in space as you are now again.

[@jamesb1856]

Gotta figure out how to combine time travel with space travel. No wonder the speed of light is so important.

[@MacNif]

What is the Known Universe moving through?

[@billnolan2945]

My series of sci-fi books talk about the threads that make up the universe, and some can see them. Basically like the world lines you discuss here. They also travel in different dimensions to move between stars. Shanna is the 1st book in the series.

[@minorleagueroadtrip6224]

I was literally about to mention Vonnegut when you did.

[@paramjotkaursodhi2408]

the word line theory also applys in the movie interstellar

[@ejmtv3]

is that the black hole scene?

[@paramjotkaursodhi2408]

@@ejmtv3 yes

[@thecoach301]

And Neil actually did the voice over for cinemasins about it

[@knifetoucher]

9:23 wouldn't the entire solar system be many millions of miles away too if you go back 50 years? It's not just Earth's orbit you have to keep track of, it's solar system, milky way, local cluster, universe expanding distances too which will all be different.

[@chebet]

🤯

[@wisdomfriday5017]

Fact

[@petersage5157]

The conceit in Seven Days of "flying the needles" was based entirely on the idea that, yes, the pilot must get the sphere to a particular place on Earth in its rotation and orbit at the time of arrival after the Backstep. The pilot always arrived fairly banged up from the effort, and rather inexplicably missing his topmost layer of skin, but not missing any hair, clothing or cargo. 9:50 Chuck must be thinking of the Star Trek: Deep Space Nine series premiere, where the Emissary tries to explain to the Prophets the concepts of linear time and temporal life to beings that exist outside of our time. For a franchise that consistently misses the mark on what we already understand about physics, I think this episode did a fair job of illustrating the concept. Imagine one of us trying to explain "up" to a Flatlander or someone who sees in color trying to explain "red" to someone who is colorblind and see if you could do better.

[@themiddleman781]

Chuck and Neil are so great together. Best pairing

[@claudelaroche2437]

Marty would almost certainly find himself in space for not only the Earth orbits the Sun, but the Sun moves along as well through the Galaxy (which also moves….)

[@Liz-pc3dc]

Just the point I made ! Didn't see your input before 😃

[@lewisner]

If he found himself on Earth he would violate the Law Of Identity which says that each "thing" is unique to itself. So an atom exists in the 1950s and 30 years later it is in Martys body. When he goes back to the 50s he takes the atom back and there are now two identical atoms, which is impossible.

[@nickrondinelli1402]

Stein;s gate uses worldlines as its central time travel interpretation.

[@hipoojan]

EL PSY CONGROOOOOO

[@artificialstupidity4541]

and iirc the time machine in s;g being a spacetime machine, best way i could explain it is the machine being tied earth as if its a moving vehicle

[@JeremySamaroo]

Someone should get him to watch Stein;s gate cause it came out in 2011 and its all about world lines

[@snens4580]

9:45 Actually a time traveling character in "Heroes" did. Not in the same context but to find the key-moment in the past where he could prevent his dystopic future. For that he has hung many strings across a room, each for every person that matter and every noteworthy event attached to it (like pieces of paper sheets or newspaper etc.). Anyway.. that's just what my memories came up with when they talked about this^^ And I know it'snot even close to what Tyson meant because his version would be much more complex :D

[@ryanweaver962]

This is seriously amazing…. Connnections… Light and mass gravity. Energy in all its contexts. So many amazing fields.

[@IAMMEDUSA]

The only problem I have with going back changing stuff is losing the character I gained from it. I look back and think how could I make the difference I made now if I didn’t walk that path I did to this point.

[@asprywrites6327]

We're just gonna ignore that 3:19 he already TOLD HIM when to meet?

[@Eternal_Genin]

Donnie Darko did the world lines as well! The bubbles coming out of their chests was their word line so when he was traveling through time thats how he pinpointed where and when in space time he had to be or go.

[@duartevilelas9688]

Great discussion (as usual👉). Funny enough, I read a Marvel comic book, (with a time travel storyline) that mentions the movement of Earth trough time as a factor in time travel👉

[@p11111]

I always thought that Doc wound up at the same place on earth because he (and the earth) have inertia in all 4 dimensions. Like when you jump up and land on the same exact spot, even through the earth is rotating underneath your feet.

[@jsmithers.]

Yeah but you wouldn't continue to have that inertia once you travel 4th dimensionally via time. Inertia is only for spatial dimensions.

[@zolomohan]

Didn't you guys upload this already? What's happening? Am I stuck in a Time Loop or something?

[@LeeGoGators]

They took it down pretty quickly last week, presumably they uploaded it early before the podcast was meant to go live

[@Anti-HyperLink]

Yeah, I remember I went to my notification that I got from it and it was gone. I was watching a different video at the time.

[@TratUsYT]

Love these two together. Love to hear nerd humor!!

[@StratoSambo]

Great vidéo. The Idea that in traveling back through time you also need coordinate is right and it was an Idea that was to be used in Zack Snyder's Justice League 3 : cyborg helps the Flash to go back in time to warn Bruce Wayne about Darkseid (remember the scene we seen in Batman V Superman) but can only come back to 2 moments in Time that aligned with earth's rotation. So they do it once but fail (BvS " i'm top soon") then got it right. Though it was a great idea when Snyder talked about it and now i see even Neil confirms it's right on track. 😍

[@lowhanlindsey]

7:05 you don't have to prevent any meeting! Just shake one of his parent's hands before he is born. That is enough difference in the universe to change the swimmer that won the race and the child born would not be The John Conner but instead a sibling of his instead.

[@jamestalkington6306]

Yall missed a golden opportunity to reference Dr John - "I was in the right place, must've been the wrong time "

[@einstein3185]

Wow looks like I’m up at 3 in the morning learning about space again

[@GiorgioGatti89]

Very nice world line model is the classic picture of big-city traffic, where you can see the "motion" of the car lights.

[@8BitKami]

If one could see their entire timeline - with no way of changing it, it would prove the concept of "fate" is real. If one could change it, there'd be multiple branches of each worldline. Even just our observation of it might make it branch.

[@sorbet237]

is it my fate to read this comment on fate leading to me questioning my fate in which is also on the set timeline

[@ThePriestofYahuahYahushah]

I counted the moons and logged them for two years. We were lied to. There are 355 days in a year. Here is a video showing you how you can go verify it yourself. Just skip to the moon information kzbin.info/www/bejne/Z2mYpJyCmLuHpas

[@pfunkPT]

Ok, so to travel in time you would also travel in space relative to the earth never thought of that... But you didn't mention that the solar system is travelling across the galaxy, and the galaxy is moving in space, so you would most definitely miss the earth. Unless if it's the same as if you jump inside a moving train and you will land in the same spot on the train but a few meters ahead relative to the ground. But that got me thinking, if everything is moving, how do you set the zero coordinate in space? How do you make a space GPS system?

[@ProxCyde]

Considering there is no such thing as an absolute position in space, you can't. It's all relative.

[@advocatus360]

I love these videos but I wish NDT would put his camera on a gimbal so the video would not bounce and shake so much.

[@theperspectivemindset1367]

We would love to have you guys on our podcast one day.

[@ryansmith7306]

The Adjustment Bureau attempted to show the world lines of various people intersecting on the agents two-dimensional books.

[@thecoach301]

Intersteller, Arrival, Stains gate, Dark And many more, Neil actually did voice over for cinemasins about itersteller

[@mlordwhiteslayerfromf.u.g]

10:57 I believe the series Stains:Gate had mention of world lines in it

[@richardgreen1901]

My 7 year old asked "if the universe is expanding, what is the space or container it is expanding into and how are they measuring it?" Thanks again Sr. Neil

[@KyleHanson]

In the time travel scenario, even on the anniversary of when you left, you’d never end up in the same spot as the sun is also traveling. Aside from that obvious flaw, we’d have to assume the earth would follow the *exact* same path, and that’s certainly impossible.

[@ThePriestofYahuahYahushah]

I counted the moons and logged them for two years. We were lied to. There are 355 days in a year. Here is a video showing you how you can go verify it yourself. Just skip to the moon information kzbin.info/www/bejne/Z2mYpJyCmLuHpas

[@Jawok2010]

Good point. Earth is moving relative to the sun, the sun is moving relative to the center of the milky way and the milky way is moving relative to other galaxies. But I think that none of this matters, because there is no absolute space in which this all happens and any reference system is as true as any other.

[@JsYTA]

Underrated part of this show is seeing a couple of nerds laugh at their own bad jokes. It's very wholesome, in a dorky way

[@jozob]

If you travel through time without changing your position relative to Space, you need to calculate much more than movement of Earth around the Sun and its rotation (Solar system, galaxy, etc. movements). My question is, can we, at the moment, even do that? (calculate exactly to when to teleport to land on acceptable place) Do we have a way to determine our position relative to Space accurately enough?

[@immortaldeadfast5530]

...Nope.

[@CRITICALLIMITT]

Vsauce did a great video, where he explained the world line with a great visual aid.

[@tettehgideon6411]

Really amazing explanation. Thank you Neil.

[@donnafink6262]

Great episode

[@tjbmom123]

Interstellar does a good job of explaining & presenting a visualization of the intersecting lines connecting humans

[@PronatorTendon]

The quintessential odd couple, I love it

[@nobodyknows3180]

They do play off one another pretty well.

[@paulosfajardo]

8:35 But I thought with the universe continuously expanding, the solar system orbiting the Milky Way, the Earth would still be in a different coordinates from where it was every year? And if so, thinking about it further, it's like, we're technically always in a new coordinate as time passes.

[@jsmithers.]

Yes it's true. I can only assume Neil was trying not to get too in depth with it.

[@surajkirandas5901]

Give me your instagram man we'll discuss all these , you're my type guy 😄✌️

[@FreeMatter4TheBlind]

When he explained world line, I immediately thought about what I saw in my DMT trip.

[@TuxedoMaskMusic]

Yayyyyyy a new startalk i LOVE YOU STARTALK TEAM!

[@MoltenArmour]

Chuck and Neil need to watch / play Steins Gate. Amazing story relating to spacetime continuum.

[@darshanjethava]

But Neil, even if he traveled on the anniversary of that date, as the universe is ever expanding, he couldn't travel back to the same space co-ordinates right?

[@Drewsterman777]

Correct. He'd have to know exactly where the earth was in relation to the rest of the universe at that time. We're talking down to the nano second otherwise you'd go back in time and rematerialize with a bird flying right through you or something random like that.

[@darshanjethava]

@@Drewsterman777 exactly .. and no one would wanna do that .. hahaha ..

[@devinreacts7165]

This is such an awesome show

[@LarsIvarHenriksen]

World lines has also been used in the fantasy book series wheel of time (coming to Amazon 2021) where the wheel spins the fabric of time, and the threads are the people.

[@melfice7]

Regarding Neil's problem with the Terminator, Skynet didnt had detailed records of everything, they just knew the name of the mother and the city, thats why he's killing every sarah connor in L.A :D

[@leewriter4656]

"have"

[@SamusSelf-Destruct]

Also, the very act of sending the Terminator back in time is what precipitated Sarah and Reese meeting. That was the whole point of the series until Genysis. The future was predetermined and they couldn’t actually change anything significantly.

[@Lightning_Lance]

@@SamusSelf-Destruct yes, it was a closed loop.

[@Tokanese]

The worldline description instantly made me think of String Theory.

[@ejmtv3]

yeah but the "strings" were "used" differently in both aspects.

[@coreymccraw8871]

Wow, these guys are great together.

[@Pablo00019]

Great Scott!!!

[@jGRite]

10:46 Anime: We've done this, and will do it some more.

[@arvindr1838]

Sauce?

[@Flexy59]

Commenting for sauce

[@jGRite]

Alright, here are some animes. Note: some of these take a long time to see it (a grid showing multiple timelines and or worldlines interacting). "Higurashi no Naku Koro ni" (may take a while to see it) Kono Yo no Hate de Koi wo Utau Shoujo YU-NO (there's a new and old version) Not the best examples, but: "Vivy: Fluorite Eye's Song" Re:Zero kara Hajimeru Isekai Seikatsu Steins:Gate

[@Flexy59]

@@jGRite thank you very much! I will watch all of those