Is Time Travel Possible In Our Universe?

[@HistoryoftheUniverse]

The first 100 people to use code UNIVERSE at the link below will get 60% off of Incogni: incogni.com/universe

[@Kaapstad420]

incogni is a scam though

[@NonBinary_Star]

​@@Kaapstad420 What do you mean?

[@Kaapstad420]

​@@NonBinary_Star They say they get data brokers to delete your data but wont provide you confirmation that those brokers in fact delete your data. Most of these types of services have been around since the phone books and are often just like typical sales companies.

[@NonBinary_Star]

@@Kaapstad420 Do you have any experience with DeleteMe? How do you feel abt that one?

[@asyncasync]

@Space Backspace what benefit does this description of it "not existing" have?

[@max-zo5ew]

Yayyy new Sleep Video Thank you

[@max-zo5ew]

added to my sleep playlist 💤💤

[@YamNovember]

Same😂😂😂

[@user-br7ry7cz5y]

@@max-zo5ew can u make ur sleep playlist public I like these too

[@pat3l2243]

​@@max-zo5ew please make your playlist public

[@sentcons]

I thought I was the only one😊

[@aarinblah]

Who else is revisiting this classic in 1943??

[@Ritziey]

😆

[@Slooby]

Damn I'm in 1946, hope U made it out alive

[@hawgslam4]

just wait

[@426F6F]

Watching this in 40,000 BC.. just showed humans the power of fire. I think they think I'm some kind of diety

[@underthewelcomemat]

I'm watching it in 4007 it's hard to breathe here...

[@WarrenatCLS]

“Over then” and “over there”. Very good concept. “Separated by time” being the same as “separated by space” is a very good way to look at it. Thanks for the new perspective.

[@1112viggo]

Isn't that in essence what we already do when we say "back then" and "back there"?

[@4NeonFun]

​@@1112viggoyes! Discussing directions in time like it was MapQuest is a very good concept.

[@1112viggo]

@@4NeonFun Yeah very practical, like the concept of spatial directions would be if everything was unchangeably moving east...

[@nine_pound]

😮😮😮😮 1:57

[@prafullvilas1931]

Also the "space time budget" part

[@Gary_Texan_USA]

My appreciation goes to the entire staff responsible for the outstanding presentations of each video of The History of the Universe.

[@musicjunk8266]

Tyson Fury?

[@DeathColor96]

​@@OregonCrow lmfao, you actually don't think there are whole teams working on youtube channels??? In this case it would be extremely impressive to run 4+ youtube channels that release atleast two 40+ min videos a month with exceptional commentary, music and visuals put together. You actually think it's only ONE person doing this???? And don't get me started on the amount of hours this person has to research all this to put it into a video of sizeable length. Very ignorant take my friend.

[@DeathColor96]

​@@OregonCrow yeah, what an insane wall of text I wrote. Must be difficult being a toxic brainlet.

[@unocualqu1era]

@@OregonCrow It's only 5 lines... I read it and it wasn't even adressed to me...

[@MATTINCALI]

the universe is pretend. time is also pretend.

[@nightly4303]

I don't know if anyone has mentioned something similar or not but your videos have been amazing for my mental health. Too often we're caught with the daily responsibilities of life; find ourselves overly immersed in social media and news that we forget how insignificant we truly are. Your videos are a way for me to just step back from the world and realize all our problems are miniscule when compared to the sheer significant size of the universe and all its physics surrounding it.

[@ClannCholmain]

👏 Well said!

[@j121212100]

Besides, we might be able to do something about being struck by an asteroid, but a rogue blackhole we can absolutely do nothing about.

[@Legio__X]

Delete your social media accounts, You can thank me later

[@tedsheridan8725]

Well said.

[@chesterfieldthe3rd929]

Very miniscule

[@unknownvariable2456]

I'm time traveling right now, but most people just call it aging.

[@jpraise6771]

Greetings my friends from beyond and within the grave. In the short time in which we inhabit this world, It would be my honor to offer you a new life with Christ. Let today be the day you begin✝️

[@unknownvariable2456]

​@@jpraise6771 I'm tired, and I'd rather I cease to exist when I die. I don't wanna go to heaven when good people are going to hell, heck I don't even wanna go to either of those for any reason whatsoever. the reality I know and believe in is one where life is unfair by design, where there is no conceivable solution to make it fair or overall pleasant, outside of directly influencing and changing who someone is. and what should I care if some altered version of me suffers forever or experiences endless happiness for all of eternity when I'm gone? should I be grateful or regretful that some fickle super being arbitrarily decided to do either of those things for me without considering my input or desires? if I am fundamentally changed to experience endless happiness or pain, I do not believe that altered version would truly be me, so why should I care when my end goal is to cease existing? not to rest forever, but to entirely stop existing. yes I could just say "my own mere mortal mind couldn't possibly comprehend the almighty's goals and means" but I could just as easily say existence simply came to be through the self contradiction in infinite nothingness, needing there to be something for there to be nothing, or any infinite value simply being impossible, and I have absolutely zero reason or motivation to choose your version of how things came to be over my own, it's all just an argument over which version of impossible nonsense makes more sense. for a little bit more of an explanation, humans are entirely limited in scope, mentally and physically, suffering can only remain as suffering for so long, and the same goes for happiness, to be capable of experiencing either forever would mean one was no longer truly human, let alone still themselves. I once dreamed of a world where people could improve themselves endlessly without limit through effort, moving forever onwards and achieving their own goals, but reality is nothing if not a thorough teacher, math and logic will not simply cease to exist in any reality that can still be considered a reality, a reality needs some semblance of stability to be called a reality after all, and claiming that there are higher realms where such things cease to matter is like 2d characters believing that 3d is simply reality existing as a straight line, moving the entirely wrong direction to picture a "higher" plane of existence. that is all to say, life will always be unfair. and I'm done with it. sure I'll live life out, be nice where I can afford to be, maybe have some small amount of fun while I'm at it, but I'm done. my grammars pretty rough, so have fun reading and making sense of that. had a lot of people say I talk like an AI, and honestly, I can kind of see it.

[@adamdodd7373]

Incorrec

[@nuribayram6740]

change(time) like aging is always constant for yourself, but if you would move very fast maybe to other planet and back to earth, people around you would have changed(aged) more, speed makes you move up in the cube(spacetime travel)

[@ILovePie53]

@@jpraise6771 the truth is the truth. vid aint lying

[@matkosmat8890]

This blend of crystal-clear information and fictional sidesteps is just the right cocktail for me. I've been enjoying your series, thank you.

[@SporthighlightsS1]

My content better

[@Three_Geese_In_A_Trenchcoat]

​@@SporthighlightsS1I'm sure your 4 subscribers agree

[@SporthighlightsS1]

@@Three_Geese_In_A_Trenchcoat im trolling and the 4 subscribers are your entire family

[@islamnuur]

Great video

[@RileyBanksWho]

@@SporthighlightsS1cringe. Booooo

[@tooldtoplay5892]

I love the theory that UFO's are use from the future observing history(for them) as I think most people would love to go back in time to witness what it was like so it is not hard to imagine that future humans are simply observing.

[@miraperko7493]

I watched I think t was a Twilight Zone Episode-in the Future where time travel is possible travel Agencies Offer trips going back in time to witness all kinds of events that happened on Earth. Example- a Volcano Eruption but are safely transported Back so not to get hurt!

[@Valkbg]

And this could be a potential answer to the Fermi paradox as well

[@the_inquisitive_inquisitor]

​@@Valkbg Three Body Problem: life in the universe is quiet because it stops being alive when other life detects it.

[@the_inquisitive_inquisitor]

You can't return to the same future if you go back in time. How many observers have to disappear, never to return, before they stop sending people back?

[@Valkbg]

@@the_inquisitive_inquisitor Can you explain further because said like that it doesnt make much sense?

[@christopherg7098]

This is by far one of the best presentations of Physics, astronomy and science I've seen on KZbin, top marks for this, the production vaule and thorough exploration of the subjects provides a terrific window into some of the most complex topics in a digestible way, keep up the great work.

[@gnjoeyhowell]

In almost every other universe, this content has been picked up by a major publisher and the authors are exceptionally well compensated. I think we will merge with that universe soon enough. Bravo!

[@WalterWhiteFootballSharing]

In THIS universe; factual stuff got drowned out on Discovery Channel with bullshit like Ancient Aliens. There will be a chemtrail show, a lunar landing is fake show, before good stuff like this finds its way on major distribution networks.

[@kayliibensen387]

I would worry that some publisher would be too quick to try to include all the crap I don't want from a great documentary. Things like useless sound effects and talking heads. This channel is essentially perfect in my opinion, and wildly underrated. Millions are asleep on this.

[@Games_and_Music]

Good point, this might be the best evidence for a multi-verse and time travel yet. Although, he forgot to say the magic word, he didn't say "vast", so... obviously this video is discredited.

[@jgunther3398]

the publisher is called youtube, and you do alright when you have a boatload of videos and over half a million subscribers, i'd imagine.

[@Unkl_Bob]

I first read comment where you have written content .. almost laughed off the sofa .. i hope I am right and you get rich

[@hyeonwoo72]

The universe is incredibly fascinating and mysterious. I genuinely want to learn as much as possible about it. If gaining unlimited knowledge of the universe were possible, I would do anything to acquire it.

[@nyko9631]

do please learn in a steady healthy pace

[@hyeonwoo72]

@@nyko9631 yeah, I will. I'm not planning on going crazy or anything, but I like learning.

[@helmetboyHD]

@@hyeonwoo72 nah dont be afraid to get obsessed. obsession when productive is a virtue

[@hyeonwoo72]

@@helmetboyHD You're right. But I'm not talking about that kind of obsession.

[@robunderwood7689]

If I could learn definitively whether or not intelligent life exists elsewhere in the universe, I could die happy.

[@tristonanan]

As someone who is trying to come up with a sci-fi story, I really appreciate the way in which you lay out these large concepts in a way laypeople can understand. It's helpful for someone like me who likes when sci-fi builds off real scientific theories.

[@MattyStJohn]

Layman

[@ryankane9546]

Check out the author michael Crichton

[@ldarm]

This is incredible; what a channel. I can't believe this is free, I really wish we had this stuff when I was a child.

[@anandjoshi832]

Exactly my feelings. Starved for content like this as a school going kid. Well, better late than never!

[@prettyytrash]

@@disrupt_ist to give you some hope, I’m a teenager and I watch these types of videos multiple times on a daily basis to expand my knowledge. I also find this stuff super fascinating and important to know :)

[@NatnaelNegash-pv6bl]

I'm so glad to have this channel it might help me get into NASA in the future (btw I'm 14)

[@ev-0163]

One of the best videos on youtube. Concise and informative. Please never change this level of production

[@bogusmogus9551]

You bet!

[@mikemars5984]

😂😂😂😂

[@Heavy-metaaal]

This is one if videos I would need to watch again. Mainly in the part it starts to explain how to get around the light speed limit.

[@mickeyb492]

Not only have you guys delivered another incredibly thorough, thought-provoking video but you've also cultivated an amazing community here on KZbin! Every time I visit the comments section of these videos I'm met with a wave of positivity. Bravo team, I wish you continued success into the future!!

[@Games_and_Music]

Yeah, these channels of his are top notch quality, definitely deserves to be up there with the major channels. His History Time channel has sorta been discovered, but my favorites (History of the Earth/Universe) are still being overlooked for the most part. Then again, they're only 1 year (Universe) and 2 years (Earth) old, and most of their videos have millions of views, so it's only a matter of time, but yeah, most viewers here wish him the best because he deserves it.

[@artdonovandesign]

Hear, Hear! 😊

[@oscar7513]

This is the wholesome kind of comment that I like reading. Thanks, man

[@SpankyK]

So true and good to see!

[@HistoryoftheUniverse]

​@@Games_and_Music History Time is run my my brother. I run Voices of the Past, History of The Universe, History of Humankind and History of the Earth (History of the Earth is a joint channel with him)

[@sahadinmosharaf]

I watched all of your videos, from the very first one. I loved all of them. Appreciate the hard work. One of my favorite channels on KZbin for sure.

[@akhkhar7272]

Me Too

[@RadagastBrown420]

I just want to go back to the mid 1990s and live through my 20s again 😂

[@NonBinary_Star]

This channel one of the best on the whole of the internet. Neither Curiosity Stream, nor Nebula channels, nor other KZbin Channels, nor Netflix, nor AZ Prime, Disney, Hulu, (I've forgotten others),... they dont hold a candle to this. imho afaik As soon as I see you've made a new vid I hop on the bed or couch and get comfy excited af! I wish I had friends that get as amped about things like this. :( It would be nice. This type of joy is meant to be shared. iykwim ♡Thanks so much for your energy and excellence♡

[@bliblivion]

3:10 you can invent the time machine and use it to do a bunch of other things, their is no need to rush to your death, you can have a full life before going back in time and saving yourself. or you can go back further in time and stop yourself from going out this night, you have plenty of options.

[@karenremus9681]

This was the 2nd episode of this program that I have watched, and I LOVED it as much as the first. This program is SO BEAUTIFUL in every way, it has me smiling ear to ear! Thank you for explaining these fantastic concepts in an understandable, entertaining way. ❤

[@tedsheridan8725]

I can't believe how content this good is simply from a KZbin channel and not on Netflix.

[@beenaplumber8379]

KZbin pays pretty well for content that engages lots of viewers. Remember, you're not the customer here at YT. They make their money by selling your viewing time to their sponsors. In other words, you're not the customer, you're what YT sells. You have a right to expect something in return, and I think quality videos like these are worth my time. It's a fair deal, but I think we need to remember our place and demand quality in exchange for what we give them.

[@eternallyMarsh]

Netflix doesn't deserve such content

[@artdonovandesign]

A new episode of HotU has actually become a major event in my life. I turn off the tools in my studio, put on the big screen to KZbin and stand there at my work table- transfixed by the astounding script, amazing narration by David Kelly and the superb music and graphics. And all with a DND sign on my door. This would be the first of many, many replays of the episode. (BTW: I particularly love the white-ring, time machine design. It's beautiful!)😮

[@Marquis-Sade]

DND?

[@DevanshGuptaChess]

@@Marquis-Sade Do Not Disturb

[@Marquis-Sade]

@@DevanshGuptaChess Ah, thank you

[@herrweiss2580]

@@Marquis-Sade Do Not Despoil

[@Marquis-Sade]

@@herrweiss2580 Despoil? lol

[@chancewagnon7332]

So my thought is time will let you travel but when you travel backwards it goes to a separate timeline so you can't actually effect your own

[@dudlesstheking]

Wow...what a journey, hard to digest at times but written and told in such a manner that you have not lost my attention for the finest of seconds...bravo!

[@fractalcounty]

Your videos quite literally changed my life and gave me a new appreciation of cosmology that I never knew I had inside of me. Thank you so much! On a somewhat unrelated note, I sometimes venture into the recent comments on your videos and am always suprised by the amount of deranged nonsense and negative comments. Even by KZbin standards, it seems like videos on these subjects attract a lot of people who are maybe a little too confident about their understanding of the universe. I think I’ve made a similar comment before, but I really hope you don’t pay much mind to them. I promise they’re a tiny minority compared to the overwhelming amount of people out there that have endless amounts of appreciation for your videos. I would bet that a good portion of people who benefit from these types of videos just opt to appreciate them silently. Don’t let it discourage you. Thank you so much for everything you do

[@Kazukidavidart]

Their DNA simply "programmed" to not understand the matrix. 1 over 10 can only awakened by this reality.

[@manmoth4]

I have a degree in physics and get that a lot. Problem is many people self-study it and don't have someone correcting their understanding, and one misconception leads to another until they're down a rabbit hole

[@allensherrill850]

It will all be crystal clear in 32 more years. Your science is getting closer to the breakthrough you are looking for. See you then

[@lcehotel]

@@allensherrill850brother if we we stay on the track that we’re on, we aint gonna be here in 32 more years

[@Beveyboygames]

@@lcehotel not true lol

[@jonathanmunz]

I didn't think it was possible to watch a 48 minute informational video and know less than I did before starting it, but you have proven me wrong. Thank you.

[@FunkyMacky]

You know more now, it's just that you have more questions :D

[@pravkdey]

Not sure if this will come up in the video but my favorite time travel theory is the reason we don't have any visitors yet is we have to create the a time machine first, like how you have to have two telephones to actually use them. And it's sort of dystopian as when we turn on the first time machine we'll get flooded by everyone from the future looking to go back as far as possible

[@sermah]

Quantum Break (videogame) actually has that idea, time machines here can move you through time only while they exist.

[@bobinthewest8559]

I have a time machine. But it can only take you to the future. I call it…. A wristwatch.

[@alistairclark6814]

Time is a unit of measurment to guage velocity over a distance travelled. The only thing that actually exists and can be experienced is the present moment.

[@G360LIVE]

@@alistairclark6814 Exactly. Since space and time are connected, and since Earth is traveling through space, then having a machine that can take you back to a specific point in time (which would also be a specific point in space) is a trip to instant death, because if the same machine can't actually bring matter, such as the Earth, back to where it was in space at that specific point in time you wish to travel back to, then your time travel machine is pointless.

[@CS.AtheistChannel.VoteBidenAOC]

🎉Like many worlds theory, that also seems like a kludge in order to keep backwards time travel possible. Imo, time travel isn't possible. Nor many worlds. The only thing I think happens is that particles simulate many possible movements. Not many worlds. Time is also not a thing, but a rate of change on each particle. Not a stream of time. Each particle is its own clock.

[@adamlove706]

Everytime I watch this I cry. It has been always my favourite channel. Possibilities are endless. This just confirms how perfect is the balance in this Universe.

[@thatfly5360]

The river doesn’t disappear. It just continues: changing. It is feed more water and the water that was in one place is moved to another. I believe that change is predetermined so future very much exists, but the past informs the present in the same way, so the past exists too. Not simultaneously, but collaboratively.

[@kirandeepchakraborty7921]

What an Excellent Episode. Really appreciate the effort that goes into the making of such high quality videos.

[@sirtykai3821]

I think time is more like an arrow mid flight. It was launched in the big bang the past happens and is set but the future is determined by present circumstances. So wind, gravity infrequencies, height differences, curvature of space change the future flight path.

[@tommasotiberi5666]

Fun fact: back when the seemingly ftl neutrino stuff was happening, the Italian minister for instruction (Mariastella Gelmini) made a statement where she implied the existence of a tunnel underneath the Alps for the neutrinos to travel through

[@Flesh_Wizard]

secret neutrino smuggling operation

[@edwardlulofs444]

Yes, there is always one. Now, in America, there are millions. I think that model is as likely as the flat earth model.

[@grayaj23]

Did they borrow Alaska's series of tubes for the internet?

[@gringo1723]

Brimmingly saturated GEL MINI tunnel presumably??? What a drag for the neutrinos... Naturally, the received neutrinos shall exhibit differing Flavors; Mascarpone, Mozzarella, Gorgonzola, Parmigiano-Reggiano, Ricotta. 😎

[@zaucy_]

Amazing work as always my friend. Thank you for yet another hour of my life that I've spent deep in thought trying to wrap my head around the idea of quantum physics and time travel. It's always a wonderful time especially when a video of yours is playing simultaneously

[@vokuh]

i tend to watch every episode a few times - i always missed a thing or two .. and lucky for us - by now their catalogue is big enough to just start at the beginning when you reach the end :D

[@zaucy_]

@@vokuh I have also watched most, if not all the episodes at least twice myself. Mostly because I listen to them while I fall asleep because they're very relaxing for me. But I too miss some things or just need to hear them a couple of times to really understand some of the topics he discusses

[@Questionthis1]

So much of this is theoretical but I believe that you cannot travel back in time past the point of when the Time Machine was invented due to the set limitations on mass and how much energy and matter can exist in the universe. You’d have to enter as something equal and opposite in mass were to leave it in order to maintain the balance of matter and not rip the fabric of space time. So in reality you can go back in time but not past the point of when you left the past. Kinda like how in portal if you shoot two portals together and start running through them you can see your own back. That’s as close as we can get to the past.

[@joey104102]

This might be my all time favorite channel. Every time a new video is posted, I get excited in a way that I can only describe as childlike... From presentation to accuracy to storytelling, this channel pretty much does it all, and does it all about as good as it can be done... But it's the way physics and cosmology are presented in a narrative way that really separates this channel from its contemporaries. If I could sub twice, I would... Thanks for the outstanding content, your time amd effort does not go unnoticed or unappreciated. Bravo.

[@GaryM67-71]

Have they explained God yet, why He created the earth and us?

[@MCMasters4ever]

@@GaryM67-71 yes, it was episoe seven

[@GaryM67-71]

@@MCMasters4ever Yes, it would be. Thanks.

[@GaryM67-71]

@@MCMasters4ever I watched the video, quite interesting. I left a comment, which I copy below for you. You may wish to view my profile page/website. Here is the comment I left there: 'Interesting things the narrator says in this video: 1. The sun and the stars whizzing around us (on earth). CORRECT. 2. He mentions the globe, and shows the globe from 'space'. Nope, how can serious scientists be pushing the globe narrative? Mad. The video dances around the subject of 'creation' and the order of things. I guess they are scared to just say it outright. The hundreds of constants and life itself prove there is a creative force and it created. We should all be able to accept that. Has that creative force made itself known to us somehow? Provided us with some rules to live good lives? Given us a chance to prove we are salient as a species (for example by asking one human to man to die to show his salience, that he's not a brute unthinking animal?). The other interesting topic is are we actually lucky to be alive here. So much death, destruction, evil in power, so many wars, pharma mass poisoning, slavery, persecutions of innocents. I for one don't feel life is something we should feel lucky about at all. It's futile, boring mostly, and mostly horrible, especially these days. Maybe the future will be different, better somehow, I suppose it's good to have hope. I don't think the creator actually really cares much about us, more about themself and their own happiness, we are just something to play with.'

[@trackietran8067]

Love this documentary! I have been thinking about these “Time” ideas for years but the way you have presented it is so fundamentally necessary for enthusiast to comprehend! Absolutely awesome!

[@JingleZBellZ]

Nerd

[@caillousdad5786]

it can only be accomplished internally, not tangibly. your consciousness will wake up in the past, but all memories of your original time jump will fade away like a dream and you'll only have recollection that it may have happened. you won't be able to remember details like a sequence of numbers (lottery winnings) because you'll be living as though you have woken up on that day. this has happened to some of us.

[@JosephTatumPage]

Yay, new video. I cannot stop watching these. Been through the entire series like 5 times now. I fall asleep to these trying to soak everything in. So much effort, time and love going into each video , the creator for this series is an absolute genius in content story telling

[@raven4k998]

so many paradox's😭😭😭😭😭

[@bogusmogus9551]

You bet!

[@stealthomodest5985]

finally !!! can’t wait to witness another masterpiece 💯

[@apokal0082]

Most of paradoxes in the beggining is easy to solve. Time-loop not necessary should begins in the same way as the loop cycle starts. You just get into car crash when was young, not died but get disabled for a life, then in many years you learn physics and create time machine/accidentaly get acces to time machine/time machines become usual thing in the future, letter to yourself is may be inside joke from work/literally whatever, you decided to come back in time and prevent car crash and change your disability, but all goes wrong and when you saved younger yourself, you died in car crash and started the time loop cycle for the first time. And by the time when letter become just unreadable, time-loop whill changes and not necessary will stay time-loop at all. Time can be changed with time travels.

[@scribeslendy595]

Just a small aside, but thank you for recommending Memories of my Mother. I'm not sure what about it resonated with me so heavily, but I was sobbing by the end of it. Its a beautiful story, rarely have I seen such a short story carry such a powerful emotional weight.

[@bluupadoop]

Imagine waking one Sunday morning to find this video seemingly magically risen from spacetime into one's KZbin feed. One could imagine a world where holidays were based upon real magic: the wonders of scientific discovery.

[@markhonea2461]

I dreamthought it was a thoughtdream

[@jerryg9924]

I like to think that going back in time would be similar to a spectator mode. We can observe but nothing more

[@einfisch3891]

Every new HotU video is like a little holiday for me. When I see it come up in my feed, I am very excited for when I am finally able to pour myself a drink, dim the lights and forget about everything else for a little while I ponder some of the largest and most difficult questions of our universe through the amazing narration and crystal clear script. It really is amazing what you all are doing, the content is truly next level.

[@lukeflanagan9247]

i have the same process, i hate when i get interrupted while taking in the new episode

[@shaunhumphreys6714]

don'f forget the the music score motifs,and the oldfashioned fonts for the chapters!!

[@georgetate6055]

I am similarly predisposed . . . I try to imagine what it'd be like to understand the math and physics of everything. Regardless, I appreciate the accessible videos!

[@shaunhumphreys6714]

Ditto.

[@thedarkknight1971]

When I was around 16 (am 51 now), 'Time Life' released a series of books (I still have my set), called 'Mysteries of the Universe' (? If my memory is correct), and there was one about time... I remember reading it and there was one specific weird way of travelling through time and it involved a HUGE MASSIVE cigar shaped man made object set in space. Now, at the time I wasn't fully aware of Einsteins work in modicum detail perse (or a lot of other physicians and their work in this field etc), but, I was really into space, and the science and understandings of behind the Universe etc, and wanted to know more.. And I did consider myself to have a 'Logical' balanced mind. So, when reading about this object (it was required to be many Kilometres in length and the diameter was also something like a Kilometre or more too), the book stated that theories had it that it would have to spin along it's length (ie like a rolling cigar along a table and not 'Spinning a pen' etc) and that spin would have to be a good percentage of 'C' (Speed of light), and then, you say, as a pilot in a ship, would have to approach this big long tube, and then fly your ship at, again, a good percentage of 'C' and fly it in a direction either 'With the roll' or 'Against the roll' of the Huge bulky tube. Now, they said, the theory was, going 'With' the direction of roll of the tube 'Could' send you forward in time, and flying your ship in a roll 'Against' the spin of the huge tube could take you back in time, but... They DID say, that naturally, it would ONLY bring you back to the point of time where the 'Space cigar' had FIRST reached it's required rate of spin and no earlier. Yeah, I got that, seemed logical. And for years it still puzzled me. That is until I started learning more about how your rate of speed is affected by and/or affects the rate of time within Space/Time physics... Still an interesting thing to read though, and those books were/are a pretty damn good read (each book covered everything - ghosts, Nazca lines, Bermuda Triangle, many subjects)... 🤔🤔🤔😏 Edit: (Just watched the rest of the video and...) 31:27 - AHA! There it is! the idea about a cylinder! Nice! 🤔😉 😎🇬🇧

[@beenaplumber8379]

They said cylinder has to be 10x the mass of the sun. I'm not sure what material that could even be made of - maybe neutron star material? And it has to rotate billions of times per second, near relativistic velocity I imagine. And can you imagine the tidal forces? It's one of those solutions that works on paper, but accumulating the amount of required mass and the energy needed to accelerate the angular momentum is unlikely to ever be at our disposal. I remember reading long ago that warp drive is also theoretically possible, but it requires many times the energy given off by our sun in its entire lifetime in order to work. That was like 20 years ago or so, so I don't know what happened with that. I do know NASA had one lab dedicated to warp drive physics maybe a decade ago.

[@Eireternal]

@@beenaplumber8379 Exactly, even if we can find it to be possible it takes near infinite energy to do AND we would need to control said energy over a given time...which would require...more energy. We'd literally need to be a type 3 civ or greater. We are nowhere near that.

[@tomaelbrecht2179]

​@@beenaplumber8379i always wonder, if a certain planet out there thousands or million years ahead of us would be capable of doing that. And if they would, for us it would be hard to believe.

[@beenaplumber8379]

@@tomaelbrecht2179 Time travel is fun as a fantasy and as a thought exercise, but when it comes down to it, I wonder whether an advanced civilization would even find it interesting to take on such a project. What fascinates us might seem a tedious waste of time to the super-advanced ETs. A hyper-massive building project just to show they could do it? Maybe just knowing they could do it is enough for them. Just another variable in the equation.

[@SamHammie]

One person explained a possible phenomenon of autoinfanticide, which could explain what occurs to your future self should your past self die. I do not recall where exactly I heard this theory from anymore, sadly. When your past self dies, your future self would near instantly regress in age, decompose, and deconstruct, simultaneously. The time machine you arrived in also remains, but returns to the sun of it's parts that existed at the time of your past self, and also goes into a state of disrepair, decomposition, and/or general age, depending on what made up the machine. The likely explanation for this is that your future self is still your future self, bit due to having died in the past, your body becomes the state it would be in within your future after you'd died, making it so that, if you traveled back 50 years, and your body was properly preserved and buried, you'd be drained of moisture, become limp, and collapse, while also having that moment of release before death a second time, since any food you had inside of your body would also need to be expelled, just like your past body would do as it died. The main difference is that food you'd consumed would also return to us former state. Had you eaten a burger, it may become raw veal, or even possibly the productive base elements that cause a cow to be conceived. Any bread would become wheat, or seeds and water. Any lettuce would become seeds, any tomatoes, any pickles. Anything like ketchup or mayonnaise or mustard would become tomato seeds, cow milk, chicken eggs, mustard seeds, various food dyes, etc.

[@obiwan-]

This channel deserves so much more! Love the content, keep it up!

[@raven4k998]

give someone an envelope that say study physic's after you get hit by a car🤣🤣🤣

[@kayliibensen387]

What a beautiful presentation. This is just some of the best quality content available anywhere!

[@D3emitz989]

Just incredible, I’ve watched a lot of context creators and you’re production is simply next level. I absolutely love your value add b roll and not some random space images over and over.

[@MrMikey808]

The way this podcast tells the story that I've heard time after time keeps me wanting more n more...plz keep up ur work

[@MisterCuddlez]

I have two facts to share: 1. It's amazing - and we should all be grateful - that these videos are available to watch here on KZbin at absolutely no cost to us. 2. It's terribly unfortunate that every single one of these videos has not been made into a documentary and added to the catalogs of streaming services such as Netflix, Amazon Prime Video, and Hulu.

[@IAmTheRealHim]

What an awful comment

[@aplifa]

Bruh ur literally just on a tiny blue planet in space... chill

[@generalhaha]

Amazing video. Only a few parts I had to rewind to try to wrap my brain around again, but overall this is incredibly well-presented, digestable and fascinating.

[@ChaosInCali]

The writing is fantastic. Kudos Colin Stuart!

[@seankelly1291]

This is some great work. Narrative and actual theory woven together masterfully. Brillinat work. So engaging. So thorough.

[@joyrida]

Thank you so much for all the hard work and effort you put into every video, it truly is amazing what you two have been able create! ❤

[@faisalee]

This was a fantastic presentation, explaining so much and covering paradoxes. Awesome! :)

[@jamesmcv]

Well done, as usual. Hand's down, the best science content being produced on this platform.

[@ReformationRamblings]

24:30 minor correction: even though in the movie one of the characters says that the time dilation is due to gravity, in reality the mathematical model they used to animate the black hole and calculate the effects of time dilation was actually time dilation due to relative velocity, not gravity. This is because the black hole was spinning. It’s actually really impressive the math they did to get all of that to work.

[@RadishAcceptable]

I wrote a short story back in highschool that had time travel in it. I took the approach back then that "You know what? The universe probably wouldn't care that much if we traveled through time." I put together an imaginary model where "every moment in time is traveling through time at one second per second", not understanding relativity back then, but the idea wouldn't need much tweaking to be consistent. So my main character built a time machine, went back in time, made a big change, then traveled back to his time and... nothing changed! He ended up figuring out that in order for the change to make a difference to the time he knows he would need to wait the hundreds of years he went back before the changes would affect the century he exists in. This system for time travel fixes paradoxes, but it might lead to anticlimactic storytelling.

[@yytyytg]

Ah yes the propagation of time.

[@shuhulmujoo]

Do you have the story still? I would be interested in reading it

[@GwynC]

So like.. that new future proceeded forward at its own pace, and never catches up to your present because they're both moving forward at the same pace? Like a wave of retroactive causality

[@RadishAcceptable]

​@@GwynC Yeah, that's exactly it. The rate that any change affects things progresses forward through spacetime at the normal rate that the universe progresses. The universe doesn't care about paradoxes. It just keeps going, at least in the story I wrote.

[@RadishAcceptable]

@@shuhulmujoo I think I do have it in storage, maybe. If I can't find it, I may decide to rewrite it.

[@AnirudhPsychPixel]

Last night I was wondering about time travel. Just idle musings before sleeping. In my limited, unexamined understanding, I concluded that going back in time will generate a new universe, a new timeline if you may. The strange thing is, I was also wondering why my favorite channel stopped posting. ..and here we are, a new video about time travel. Can't wait to watch it. Thanks for all that you do.

[@aseriesguy]

I ran across a scenario that supports the Many Worlds concept. The idea originates in the classic computer game MYST. In the Myst Universe the Traveller encounters an island dominated by what appear to be puzzles. The puzzles involve mysterious books when used properly transport the Traveller to Worlds with unusual characteristics. It seems the civilization that created the books used special techniques, materials and language writing the books. Using the book correctly sends the user to a world that exists exactly as described in the special language. My theory of the operation of the world books works because the Many Worlds concept implies a Quantum Universe with an infinite number of possible world lines. The Myst world book describes a world in one of the possibles world lines and using the book correctly transports the user. Of course the user must possess a originating book to return.

[@kevinsayes]

I look forward to new videos from you guys so much. Truly a treat, thank you. And man spacetime is weird.

[@rga1605]

The many-worlds interpretation is really interesting, but honestly I feel there's something missing because it's too convenient to solve these paradoxes, but since I'm not an expert, I can't say anything further.

[@VincenzoBarbato]

many worlds interpretation of total bullshit end utter nonsense it would mean that there have to be multiple universes for every single atomic interaction between two particles, and we have lots and lots of particles interacting continuously it would mean we are generating am infinite number of universes every second and then ruse universes have to be generating an infinite number of other universes

[@Safetytrousers]

The many worlds weren't conceived to solve these paradoxes.

[@SuperMaxxxey]

8:19 Pluto and Aristotle with invisible Basket Ball.

[@samanvayasrivastava559]

Such complicated concepts are explained so beautifully that it makes a wonderful watch… already watch it 3 times in a row and I will rewatch it again many more times ❤❤❤

[@trappedkitty5335]

You cannot go back or forward in time without knowing *where* you will end up in the universe. Every second, we are moving 220 km, relative to the center of the Milky Way Galaxy. Pretty fast, since the distance we move around the sun in our orbit is 30 km/s. Don't forget to factor in where you are on the planet for spin speed on our merry-go-round. But in what direction is our galaxy moving and how fast? With no other stationary objects in the (currently visible) universe to determine the absolute velocity of the Milky Way through the universe, we are left to imagine what that looks like. Also, what other actors are affecting our trajectory or speed? We did choose the Great Cosmic Attractor and cosmic microwave background radiation to help gauge our velocity, but that is still science in its infancy. We have no idea whether the objects we are racing toward are moving against us (salmon upstream) or whether they are moving along with us (turtles in a current), but at a different speed. It certainly would matter if you traveled in time! This is the difficulty of being Earth-bound beings who have great trouble thinking in four dimensions. We think we are static and that time is static. This is simply untrue, as time is the measure of regular movements, not a universal constant. Not yet, anyway. So here is the final conundrum: Unless our tools for time travel, supposing we are able to calculate the coordinates of where we were or where will shall end up, are absolutely accurate, with no margin of error, a transport will mean ending up elsewhere in space, perhaps in an object, or so far from an object that catching up to it is nigh impossible without another inaccurate jump. I certainly wouldn't want to aim for being _on_ a planet, since I may end up in, on, or around it instead.

[@brianwalters4549]

Everyone thinks you need excessive speed,which is false,you need vibration and pressure,it's going to feel like your soul is leaving your body,extremely hot

[@ewutermohlen]

Traveling to the past also means the ability to escape a black hole. And a black hole might also be the gateway to multiple timelines. Beyond the event horizon of a black hole all the possible futures head towards the singularity/ringularity. No matter what happens the future is inevitably in the centre. That also means multiple past events all end up at the same point. Meaning if you could travel back in time, you can pick any timeline from that black hole to visit whenever. But no matter what, time travel is literally out of this world.

[@josh_nbd]

Thank you for all the effort put into these masterpiece videos. Un-ironically doing more to spread physics education and discussion to the general public than most public educational institutions. (Physics department at my college was on probation the entire time I was there- 3 and a half years) Thank you again

[@truthisaquestion]

Time travel is not physics. Its fantasy.

[@beenaplumber8379]

@@truthisaquestion Putting limits on things you don't fully understand is not science. It's religion.

[@truthisaquestion]

@@beenaplumber8379 Just bc I have a dissenting assertion, “I don’t understand”. That’s called gas-lighting. Narcissists do it to gain power in a conversation. Your narcissism is further evidenced by your attempt to make up your own definition of religion and impose it on me. However, your out-of-hand dismissal of my comment clearly indicates you belong to the religion of scientism. You worship science and scientists (priests in your case) administer law (dogma).

[@truthisaquestion]

@@beenaplumber8379 Evidence of a delusional science zealot: 1: Freely admits he “doesn’t understand the math”, but is quick to dismiss dissenters 2: Accepts unproven consequences of physical theory (like time travel) without question 3: Jumps to conclusions about the level of education/“understanding” of dissenters. …Just bc something is “theoretically possible” it doesn’t mean it conforms to reality. If you make a copy of a document, you can flip the page so that the last part prints first and it looks identical. That doesn’t mean people can “write backwards” by starting at the end and working their way to the start. …that is not the way we structure and express thoughts (if we want them to make sense, i.e., conform to reality). Example: “Ball the kicked Tony” Vs “Tony kicked the ball” Do you go around saying “Ball the kicked Tony”? If not, why? The math you freely admit you don’t understand is just a human description of reality which you have conflated with reality, itself. The equations are symmetrical. Concluding that reality is symmetrical is like concluding the person that posed for a painting is made of pigments and brush strokes on a canvas. BTW, physicists cover QM in 3rd and fourth year university. Mathematicians cover those equations half-way through 1st year. Physicists are just given the equations and mathematicians have to prove them. If you don’t understand how we get those equations, you are in no position to draw conclusions about their meaning.

[@beenaplumber8379]

@@truthisaquestion I'm curious who invented this idea of religious scientism. I don't know. Therefore, I don't know. Scientists don't know, nor should they claim to know. (I'm a retired neuroscientist. I do understand science, but not physics.) The product of science is not certainty, but a good idea that can be built on. That's all. If anything, I am of the "religion" of I don't know. (Socratism?) You said something with certainty. "It's fantasy." You think you know. You are not like me. I don't know. I don't think any of us know, though you disagree. Faith is an internal experience. Those are the only things I can know - my internal experiences. If you have faith, I actually envy you. As Dan Brown wrote, "Faith is a gift I have yet to receive." I have never had an internal experience that told me I needed to believe in something. My life would be a lot more comfortable if I had faith. Soon I will die, and that idea scares me. A belief in some sort of afterlife would keep me from being so scared. But faith and beliefs can be a hindrance to learning more. If you learn the answers from faith, why look any further? What other discoveries are you not making because you have stopped looking? In your case, I think it's unlikely you will ever discover time travel. Your mind is made up rather than open. An open mind is necessary for discovery. Science is always open because we are never certain of anything. We hold onto good ideas until evidence comes along that refutes them. Then we come up with new ideas that fit the new evidence. In that way, science is self-correcting. There is nothing religious about that. People with certainty in their faith are immune to contradictory evidence. I prefer to keep an open mind, though I wish I had less fear in my life.

Thank you for the great quality of production. I always enjoy your videos. I watch they from 2 to 3 times to get all the information.

[@ChroniclesOfEnigma]

Great video!!!!!❤

[@Italianjedi7]

This was without a doubt, the best video I have ever seen about time travel. I understand everything now. Thank you!

[@vokuh]

agreed!

[@ena124]

I appreciate your content! U cover a vast miriad of topics on your channel about different sciences. Not only are they entertaining, your charisma and the calm to your voice make them a must catch! I truly appreciate the fact that your videos r in depth , detailed, contain broken down concepts and lengthy in a sense that truly keeps me captivated! Bless u and i hope your channel grows enough to attract people who truly value this kind of info. Still beats me that all this is free. More growth to you!!!

[@Playingcaards]

Dude I can’t stop watching your stuff. I watch one then scroll down and see a bunch of other stuff from you and get curious and end up watching like 100 videos!

[@mute9914]

Your videos always amaze me, keep up the great work. This channel is one of a kind

[@arethosemyfeet7144]

The idea of the block universe has always resonated with me, as soon as i learned sbout Special and General Relativity. If as Einstein says, time is intertwined and each observer has their own perception of time, every action is already mapped out. The decisions we make aren't free will, despite what we intuitively think. Every possible action and reaction, is predetermined by the very first condition that gave rise to the universe. It is the ultimate version of chaos theory however, and despite it being possible to calculate the future, it wouldn't be practical due to the vast number of quantised or plank volumes that make up the universe. We would need to compute every single coordinate, which in itself would take far longer than the lifecycle of the universe The only thing I would add, is that the results of this makes it difficult to visualise time as a single dimension as it would require a time velocity for each observer. It majes more sense in my mind, thay time is also multi-dimensional. We each forge our own path in space and we do so also in time. It may be hard to visialise, but imagine a hollow box, a 3 axis if you will. Each observer would take a different line to get to their point in time, much like how it works in space. Similar to the 4D graphs cut down to a 3D representation by ignoring 1 dimension if space, we could plot the X & Y axies as dimensions in time, and break space down to a single dimension on the Z axis. The resulting lines would show us moving from A to B on the space axis, but our prigression through time would differ which allows for the past, present and future to all exist simultaneously, every observer is just in a different time-space and ses the same events unfolding but on theur own timeline I wish i still studied Astro-Physics and Higher Mathematics, but it has been over 20 years. I have an idea of how the calculations could work but it would require years of brushing up on old maths knowledge. I would love for someone with more experience and knowledge than me in the field, to pick apart that idea and explain why it is impossible to me, as it seems to be the obvious reasoning (in my mind) of how relativity and individual frames of reference would work

[@ringoisacandyapple]

I can kind of understand what you’re trying to say, and yes, you are right when you say that time is multi dimensional! We experience time in linearly, because that’s the part that we travel due to being on the planet earth. But if we were in different places in space, we’d experience time differently because time is always there and it changes depending on acceleration and even forces like gravity! And what you say about perception is true for a literally anything I think! Everyone always has their own perception of everything around them, and it could be so drastically different for the other person, so yes time is experience differently to everybody. Children and young people experience time differently than older people do. One really interesting thing about time is that it is just a way to measure some thing lol if you had a sidewalk that changed over time, regardless of what it turned into it would still be that thing to somebody at that time whether it’s a sidewalk or not. Regardless of all of that I’m not a professional just a amateur enthusiast lol.

[@TheSilverShadow17]

​@@ringoisacandyappleBlack holes are an extreme example because they literally slow down and manipulate time with their gravitational force which means that if you spent 1 hour for example in orbit around one it would be the equivalent of multiple decades by Earth terms. Just like how light is ageless because the particles that make up the light have never experienced any time passage because their clocks never ticked. If we somehow were to reach light speed, time itself would grind to a halt and appear frozen for the individual who is moving at said velocity.

[@mohamedlahmamsi4639]

to explain the time loop paradox without using the multiverse theory can be done using the quantum superposition especially at the nods, at which they can be only 2 possibilities at the same time nod depending on how you view it. I think with super positioning, time fixes itself up, so you go back to save yourself and pursue your life at the same time nod. This could be one way to explain it.

[@orisphera]

How do you define free will? Here's my definition: free will is the ability to act upon any pre-defined algorithm (unless it's too complicated). There was a time when someone else replied with their definition. However, their definition was flawed because it depended on how you reset time. I pointed that out. They made a reply contradicting their example

[@Flesh_Wizard]

It's possible. You can only go into the future, and you can't come back. How? Go really, really, really fast.

[@blake7908]

Holy crap, so excited to watch this later!

[@carlcowan7044]

I've been looking for a good time travel vid on KZbin for a minute, and this is SOLID!!!

[@Ricalloo]

I remember the first time I encountered the bootstrap paradox, before knowing what it was called. It makes intuitive sense to me, despite being hard to explain. I think this is because what I know of physics leads me to believe there is only one timeline, no splitting off into variable timelines or such. Just the one. Anyways, this encounter with the bootstrap paradox happened in the early '90s from a cartoon show called Gargoyles. The main antagonist, a wealthy eccentric who loves the occult, literally went back in time to save these ancient coins for his future self to sell, starting his financial empire.

[@etunimenisukunimeni1302]

Any day when HotU releases a new video is a good day

[@-handala-]

Wouldn’t the earth not be in the place you left it when you travel in time? It moves quite a bit.

[@chicarbiomed]

I’d feel like an @$$ if my first time tour I got lost on the wrong side of the galaxy

[@navinsingh1730]

Earh orbits the sun, which orbits the Milky Way, which moves in spira towards the Great Attractor. So each day you are at a new location in space even at your house.

[@Hollycrapful]

But if space and time are the same then if you move in time wouldnt you also move in space?

[@navinsingh1730]

@@Hollycrapful space and time are not exactly same, but movement in time can be curved towards space. That is gravity

[@MediaSubliminal]

You would either have to travel in a space ship to the point that the earth was or will be at your destination or you would have to rewind your own timeline. You better hope you don't miscalculated or you could end up buried deep in earth or worse.

[@UnwiseGamgee]

If you are here because you don't understand the show "dark." Rest assured. You won't be disappointed.

[@RobertVincentMusic]

The beginning of this video sounds like a great opening scene for a movie.

[@gaberyan6283]

Though I have heard these principles suggested before, your demonstrations of their potential validatity and sucient explain of their workings is top tier. I find it hopefully and motivating that regardless of the adversities I may face in this timeline, somewhere out there somewhen, out there, exists of me who is successful and ultimately will achieve all I can ever have desired. Morbid when you stop to consider the implications of it all but still reassuring none the less.

[@Epoch11]

I also wanted to add that your video about whether we have found The Theory of Everything is one of the best and most informative videos on the subject I have ever seen. Your explanation of physicist Juan Maldacena's discoveries might be one of the best on KZbin, if not the best. I would love to see more videos that go that deep and explain Concepts which are that profound. Sadly there is too much content on KZbin about things which have been explained over and over and over again. You make such wonderful videos than I would really enjoy seeing ones on the new Concepts and theories that physics is currently addressing.

[@lefritte1055]

Watched this at 3 am and it was great, although i have to stand up at 6 in the morning i have no regrets. Great video!

[@nickpmusic]

Sounds like there is a "Paradox" Paradox.

[@fratercontenduntocculta8161]

This is the most pleasantly mind melting video you guys have made so far! I finally got time to sit down and rewatch and ponder it today, I learned so much just from this video alone!

[@Вованчег-у2ь]

Unfortunately, time travel is impossible. Because the time traces (in other words, world lines) of all bodies in the Universe are drawn from beginning to end, they do not move. Only one thing moves on these time prints - Time. It "pulls" all objects of the Universe along their time traces. In front and behind Time, all traces are frozen. And even if they create a time machine and send someone back, he will get stuck in these frozen traces and his trace will break off, because Time has already gone further and cannot "pull" him from that moment. But if you send someone to the future, he will also get stuck in time traces, but when Time reaches him, he will "come to life" and continue his movement into the future. Although he will not notice this sticking, and will think that he instantly moved to the future. This is an excerpt from my interview on KZbin. The most interesting thing is that at one fine moment Time will reach the end of time traces (world lines), reflect from the dead end and go back ))) I'm really interested in how we will feel when time goes through us in the opposite direction? ;)))

[@seadog8807]

Yet another amazing episode, thank you for the continued production of this unparalleled content! 👍👍

[@Lievendevlaminck]

Thank you for the many excellent videos. Very well thought through and narrated.

[@WB_Mel]

These videos are so interesting, it's honestly as captivating as a movie like Interstellar but educational its strange and perfectly done great job!

[@trapguy0900]

As a physics researcher, I have nothing but praise for you, a masterpiece, scientifically accurate and mesmerizing presentation.

[@parentfake306]

I am visiting the past right now. Hello.

Bye. How will you have been?

[@parentfake306]

@ great then ded

[@parentfake306]

@ although I cannot tell you when because that would create paradoxes.

[@jbed6]

in order to maybe(?) solve that letter time loop scenario: come from the other side of the street, give past you a good pull out of the way, hand over the letter, leave without a word. letter is delivered, life saved, and you might continue existing because you “closed” the loop

[@Wreckz_Tea]

What if supermassive black holes are just advanced alien civilizations harnessing the power of entire galaxies?

[@johncipolletti5611]

Hey, I go through time travel all the time! I lay my head down on my pillow at 11 PM and the next minute, it's 7 AM! Tell me that's not time travel. Also, last week, my 6 year old son and I were playing ball. Suddenly, he is 38 years old! Now. do you want to experience going back into time? Just listen to a Republican talk about how they will try to take us back to the 1950s!