NOVA Time Travel Episode

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3 жыл бұрын

This episode from 1999 is one of their best. I posted it because you cannot find it otherwise. If you enjoy it, donate to your local PBS station today: www.pbs.org/donate/

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@davidkennerly 11 ай бұрын

It was fun to travel back in time nearly a quarter-century to re-watch one of my favorite NOVA episodes from my comparative youth. I suspect that re-runs - and our memories - are the closest any of us will ever get to time travel. Perhaps that is as it should be.

@skate103 10 ай бұрын

Well said!

@andykod77 7 ай бұрын

Time travel has already been achieved, ask Andy Basiago

@sidensvans67 8 ай бұрын

I could listen to Carl Sagan forever . RIP 🙏

@cor2250 2 ай бұрын

True . I love his peaceful voice

@malakiblunt 2 жыл бұрын

"in 10-15 years when we have the full laws of quantum gravity in our hands" - 23 years later and no closer to haveing those laws

@heinzdelf Жыл бұрын

Quantum Mischief & The Superposition of Cause & Effect

@jarehelt 11 ай бұрын

not in your time-line

@ntal5859 11 ай бұрын

Especially when someone like you can not spell "having", if can not master basic English what chance would you have mastering gravity.

@saulsavelis575 11 ай бұрын

no such thing like quantum gravity, gravity is just an electric field but very very weak

@trout3685 11 ай бұрын

@saulsavelis575 according to you?

@twistedtrails8128 10 ай бұрын

i time travel every night when i go to bed. i wake up in the future...

@Tucas_Properties_LLC 11 ай бұрын

This episode is a masterpiece, one of the best in the NOVA series.

@saulsavelis575 11 ай бұрын

it is all nonsenses in one place

@deemisquadis9437 10 ай бұрын

I time travel all day. 😅, remember everything I learned and lived, and looking int the deviation of what the world is becoming. Yeah, I sit in my lazy boy and travel all over the place. 😊❤

@TheEnigmaUniverse-vt2pm 8 ай бұрын

"thank you for uploading these videos. Even if I'm having a hard night, I just put a relaxing astronomy video on and listen. It always makes my nights go much easier. Thank you!!!"

@samson9535 2 жыл бұрын

This is exactly what I need. I want to gtfo of here and go back to a time where I can feel free, again!

@rosanneshinkle4133 10 ай бұрын

Sad to see Carl Sagan looking like this. May he RIP.

@dracomaster4 10 ай бұрын

It's strange to see Carl Sagan, who passed so long ago, and Kip Thorne, who worked on Interstellar (2014) in the same video. Time really is relative. Einstein said it best, an hour on a bench with a beautiful woman can feel like a minute, and a minute sitting on a hot stove can feel like an hour.

@yeahyeah5976 10 ай бұрын

Wonder if that beautiful woman was his cousin. Really puts the relative in relative.

@mayamanign 10 ай бұрын

@@yeahyeah5976 Shaddup

@yeahyeah5976 10 ай бұрын

@@mayamanign Makemeh

@mayamanign 10 ай бұрын

@@yeahyeah5976 I don't have to. You acknowledged my shaddup. Mission Accomplished.

@johnhummer265 5 ай бұрын

Remember too that "time" (existence) is something WE invented (created) to make sense of "our world",......clocks, calendars, numerical equations, are all inanimate objects of our creation......most living things have no interest nor care about these human ideas.....but Einstein made a good example of relativity and without all these invented terms, our world for us would be meaningless.......

@agentsmith28052 7 ай бұрын

KZfaq is the closest thing that we have in 2023, to a time machine. 👽

@billpfund2123 2 жыл бұрын

I have tried to find a video as good as this one that explains time travel the simplest. What makes this even better is that they interviewed some of the giants in world of black hole physics, some of which are passed away now. Primary source material!

@John-ci8yk 11 ай бұрын

I remember this episode, I recorded it on a very poor quality VHS tape by mistake and I wanted to re-record it on a decent tape, it aired once on Primetime on channel 12 and one late night, once Primetime on channel 23 and one late night and that was it. We had a newspaper every day with a TV grid and broadcast television channels in Philadelphia, well you only got seven of them. So I cannot thank you enough for giving me this free episode of Nova. Thank you, thumbs-up and have a nice day.

@ModestNeophyte 10 ай бұрын

My mother and i have loved space and time documentaries almost my whole life. I remember checking out cosmos tapes from the library qhen i was a kid

@beenaplumber8379 10 ай бұрын

I wish my mom had any interest at all in science. Cosmos was my comfy place as a kid. To Mom, science was nothing but a way for people to show off how smart they were by making things complicated. Funny that two of her 4 kids became research scientists.

@geraldmiller5260 10 ай бұрын

Carl Sagan died far far too soon.

@johnrudy9404 11 ай бұрын

Cerebral...thanks for this.

@alonzogarbanzo 6 ай бұрын

Thanks to NOVA for using Erma Franklin's version, the first to be recorded, of "Time Is On My Side" rather than the more well-known version. Much my preference!

@mxbishop 11 ай бұрын

A wormhole was featured in the movie _Star Trek: The Motion Picture_ from 1979. This is six years before Sagan's _Contact_ novel, and a full 18 years before the _Contact_ movie.

@robandrews4815 9 ай бұрын

There was a young woman named Bright She traveled at faster than light She left one day In a relative way And returned the previous night!

@dylan3657 7 ай бұрын

Pizza man

@johnrider5701 Жыл бұрын

I'd love to travel back in time the 21st century is bloody awful .

@loneprimate 11 ай бұрын

Well, it can't make you go BACK in time, but there's a magic drink that stops you going FORWARD in time... bleach! :)

@johnrider5701 11 ай бұрын

@@loneprimate You obviously thought about your witty reply but you failed to be even slightly amusing but Keep trying to be a joke writer.

@melted_cheetah 11 ай бұрын

Wait til you see the 27th century

@gerardopc1 11 ай бұрын

Thank you for sharing this episode of NOVA. Greetings from Mexico.

@mrhassell 8 ай бұрын

I remember watching this last century. Also, to Mr Kipp Thorne, the idea of wormholes was first introduced by German mathematician, philosopher and theoretical physicist Hermann Weyl in 1928.

@eNigma011 10 ай бұрын

Dr. Thorne later said it was impossible to travel backward in time through a "wormhole" (Einstein-Rosen Bridge), only forward a couple minutes at most. PS - The video of Dr. Sagan looks like it was made not too long before his untimely death December 20, 1996 (age 62). He had just seen the first "rushes" of the film version of his (and his wife Anne Druyan) only novel "Contact" and, reportedly, was quite pleased.

@piggless 10 ай бұрын

If the world has ever lost anyone too soon it will always be him.

@philipmcdonagh1094 11 ай бұрын

Time travel well I'm watching this 24 years after it was made.

@jameshale6401 6 ай бұрын

So look at your phone what is the date on it You traveled nowhere

@SuperBlinding 10 ай бұрын

Thanks for posting this video.

@YogiMcCaw 10 ай бұрын

These old Novas are like comfort food for the scientifically-inclined boomers among us. Carl before he died! Kip Thorne without the speech tic! Heartwarming stuff!

@DeadPool-ub4jb 3 жыл бұрын

Thank you for uploading this.

@lylesfredidog1507 9 ай бұрын

Time is something by which we measure movement, if nothing moves, there is no time.

@andrewemery4272 10 ай бұрын

Barman says "We don't serve time-travellers in here." Time-traveller walks into a bar.

@frankbellproductions832 3 жыл бұрын

Thanks for adding this. I have been trying to find it for years. As far as I know, it exists only on the old VHS format, which is unavailable. Great episode.

@bobtimster62 3 жыл бұрын

Exactly! My comment in every way.

@artseye00 8 ай бұрын

💯

@cyberbitus 10 ай бұрын

Thank you! I so much admire/ admired this man.

@cyberbitus 10 ай бұрын

Carl was not only a great scientist, but he was also a very eloquent writer. He had a wonderful teaching ability and made a patient but insistent logical appeal to common people. This is a very rare ability in scientist, especially his calm, compassionate understanding and response to unreason and irrational hatred born out of fear.

@robburnside6636 10 ай бұрын

It can’t be done. Every molecule, every cell from every being and thing in the entire universe between now and the chosen point in the past would have to be revived, restored and reassembled to its state at that chosen time.

@artseye00 8 ай бұрын

oldie but a goodie😎

@heroicrockstar 10 ай бұрын

What a voice 👌😁

@ireneparrish3070 10 ай бұрын

There are issues that no one seems to acknowledge. Moving through time also involves moving through space. The earth is hurtling through space in a solar system that moves in a galaxy that moves. To get back to 1953, you also need to get back to where the earth was at that time. The other problem is injecting matter (a time traveler) into another existence. The traveller creates a void from where he/she existed and creates a positive amount of matter into another time. Matter can be converted into energy, and energy cannot be created or destroyed. But the traveller has done both.

@brucelee5576 10 ай бұрын

Good points , if time space or matter even exist in the first place , space is the construct that gives the illusion that things are separate, everything is connected ( zero point) , there’s no such thing as 1953 or a spot where the Earth was, I’m I really replying to your comment or are we really just one but think we are two different entities.

@saulsavelis575 11 ай бұрын

insane scientists

@skyemac8 11 ай бұрын

One timeline. There’s no going back. We are not even in control of the events in the present absolutely. We just think we do.

@juliocortez5209 11 ай бұрын

🤡🤡

@adammuncy8475 10 ай бұрын

Looking forward to watching this. That being said, why doesn't PBS put these up on KZfaq, and ask KZfaq to simply monetize it with family-friendly ads at the beginning? Seriously? Surely there's a demand for some of these old broadcasts, you might as well try and recoup some more taxpayer dollars through a couple 15 second ads at the beginning. Surely they can find some college interns to work on this for them.

@ericlipps9459 7 ай бұрын

It could be that time travel is possible but so difficult that it could never be done in practice.

@cor2250 Ай бұрын

Same if you are stoned like me ,your mind goes slow so your mind stay little in the past ,your body in the same time goes to the future ,when you get sober ,time is going fast for us . Think about that ,same dreams bring you in the past or future ,and before you know its hours later and you wake up .

@1dgram 11 ай бұрын

The issue with the quantum tunneling experiment: If you can front-load which particles make it through the barrier, preferentially cutting off the particles in the back of the pulse, you’ll falsely measure a faster-than-light speed, even though no individual particle actually breaks the speed of light. Remember that you're dealing with a wave that is spread out slightly in the time domain.

@jamescarter8693 10 ай бұрын

1 dam gram of Heroine any where in time better then greedy farms in my here and now

@sagebiddi 10 ай бұрын

But this in itself then by your own definition is not only messing with causation purposely which moots the subsequent beginning state TO even then fairly observe the spin direction of whichever particle you want but either way you already forced "redundancy contaminate" or I guess a few less ri-gd-diculously unnecessary complexities way of relaying it is that you have already cheated the " Shrodingerness" by having knowingly inciting catered variables by let's just say "peeking" in the gd box when at its core point is to knowingly NOT know the state of wtfever is the initial state of the not just simply the cat but moreover the actual then at that point of space-time the overarching encompassing state period ...and this is the immensely paramount characteristic ...of even the action of even wanting to ever think about just mabey taking a little peek at the initial stages before you can have a "sterilized" fair equilibrium from the same point in space-time. It's the OBSERVATION that happens AFTER then witnessing the spin of which ever particle you THEN eventually...again with having made the initial effort to be purposely blinded absolute until the very moment the variables of the whole gd experiment give the marker in the same train of causation of the same space-time so once you DO observe the spin direction AUTOMATICALLY and right there "faster" than light also observing the entangled intertwined paired particle instantaneously or rather simultaneously spinning the equivalence in the exact opposite direction of its own partnered particles spin direction no matter if I have one situated in my room next to Tosh in Dayton and the other one is making its way through the last semblances of the debris field of the far side of the MF Oort Cloud . This isn't a theorem in the sensationalism from the juxtaposition we usually find it I our constant overlapping usage of the base meaning of the actual word but a theory in the same sense as the theory of gravity. And I hope to the imaginary sky daddy you don't fkn wanna see if that shit ain't really real off your roof. The doubt is understandable and completely OK. But denial flat out because you don't get ifs gist is the epitome of ignorance. The double slit experiment has been done , several times by several different physics collectives, in different countries in different cultures using different languages before you or me was a fkn itch in our daddy's pants. And this is AFTER Shrodinger himself had already been done released and had his original catalyst for his abstract paper peer reviewed and moved tf on to bigger projects.

@jerryhand8538 9 ай бұрын

@@sagebiddi sorry , I did not have TIME to read all that 😂😂😂😂

@sagebiddi 9 ай бұрын

Well this isn't surprising since I wasn't talking to you or anyone else who is preoccupied with finding a very tiny sliver of flesh from a random female superhero @jerryhand8538

@tonywood3660 10 ай бұрын

I am sure I saw this next month....

@billruss6704 11 ай бұрын

Time travel party, starts yesterday at noon.

@robertromero8692 10 ай бұрын

This isn't the NOVA time travel episode I was hoping to see. I wanted the one with Dudley Moore. But it's still good.

@WilliamQuay 10 ай бұрын

Sagan was too optimistic about resolving quantum gravity, eh? Although I guess we were closer than ever to the TOE these physicists would like to find. To my knowledge we’re just not there yet, even with the CERN research. Much credit to these scientists who devote their lives to understanding the hidden gears that make our world work.

@igorschmidlapp6987 10 ай бұрын

I'm an actual time traveler. I travel to the future at the rate of 1 second per second... ;-P

@sharkmedia5969 10 ай бұрын

What if instead of a warp in space, a wormhole took you out of time and matter so that you would be observing the entire universe from outside of it and then you could re-enter at any time or place?

@iampoch01 10 ай бұрын

Personally, I subscribe to the parallel universes theory. It also answers the Grandfather Paradox. Nature won't permit you to make changes to your reality's past, but it does permit for the creation of another parallel reality where the changes you made apply. So, you go back in time and kill your grandfather. You don't fizzle out of reality, but you've just created another parallel reality where you don't exist. If you go back to your "present", you go back to where your changes didn't apply and not to the one that you created.

@johnshields6852 11 ай бұрын

The beings that fly in our skies have figured out how to bend or fold space/time, they can travel unimaginable distances in moments, as far as we humans, I don't think your going to see us acquire that ability for thousands of yrs, if ever.

@jrgaskin01 10 ай бұрын

the present is as far as you can go into the past.

@SoirEkim 11 ай бұрын

Wouldn’t it be wild if at the time of the “Big-Bang” when matter was tearing itself new holes that the same molecule was forced into a paradox just like the billiard ball that came out of the pocket a then stoped itself from entering the pocket so that all matter is actually the same molecule interacting with itself everywhere? Thus allowing that one molecule to experience increases in molecular changes forming every seemingly unique molecule on our periodic table of elements. How many worm holes would this molecule have to pass through and then stop itself from entering to get to the amount of everything we see? Maybe life is a paradox … Food for thought.

@igorschmidlapp6987 10 ай бұрын

The key word in Einstein's Theory is "THEORY". Tested, with compatible results, but never proven... "I think that it may be, but, I don't know..." is a perfectly acceptable statement in science...

@mcvicarross7 10 ай бұрын

Any of these Proffesors of Astronomy & such like sound good but everything they believe and talk about is all based on Theory ... It's the most frustrating word known 2 man .. other than no!! 😂😂

@owenlaprath4135 8 ай бұрын

You do not understand the meaning of "theory". When you speculate, that is a hypothesis. Support that hypothesis with a model that allows prediction of results, and also find either naturally occurring examples or run an experiment that is repeatable, and the hypothesis becomes a theory! A theory is proven fact, until it is falsified by another proof. Relativity HAS been proven thousands of times. We use GPS every day, just as one example, and GPS works, because it calculates locations using Relativity Theory. Clocks run different in space, further away from the Earths gravitation centre and at orbital speeds. The math is complex, but we PROVED it with hard results, by bringing back clocks that showed a time different from those that stayed behind. Those differences in time are used to calculate positions in space, so you can walk into a McDonald's to stuff a burger in your pie-hole without looking at the building, because you are yacking on your phone and texting, while it also guides you, with you being as oblivious to all things around you, as you are ignorant about what a scientific theory is. There are more tests, and they all prove Einstein's Relativity Theory.

@donaldstewart9873 10 ай бұрын

we can only go in to the future!

@tymz-r-achangin 11 ай бұрын

Lets just be real. Time travel, regardless of past or future, is impossible to visit events of the past or future. There is no storage of the past events to then be able to revisit them. As for the future, it hasn't even happened and therefore no way to go to something that doesn't even exist yet. Will also add that if travel to the future was possible, then this says everything has already been done and nothing is random.

@REDPUMPERNICKEL 10 ай бұрын

You could summarize your intuition (which is correct in my opinion) by saying very simply, time is a concept only.

@user-me8ot1iw1q 10 ай бұрын

Time an invention of mankind

@REDPUMPERNICKEL 10 ай бұрын

Yes and its easy to see why. It is an impressively useful concept and obviously essential for synchronizing behaviors within civilizations in the interests of survival.

@jeffdee 11 ай бұрын

"In ten or fifteen years when we have the full laws of quantum gravity..." - 1990 😀

@REDPUMPERNICKEL 10 ай бұрын

lol

@gerardopc1 11 ай бұрын

50:10 Oh boy, you were so hopeful and confident about the future. We're not closer to understanding quantum gravity yet, 24 years later.

@REDPUMPERNICKEL 10 ай бұрын

We cannot know 'reality' because we are thinking things and everything that 'reality' provides manifests as our thoughts. Everything! Immanuel Kant asserted that time and space are categories of thought. What he meant by this, in part, is that you cannot have a thought that is not painted in your mind on a background made of time and space. Recently I have realized that time is a concept only. I wonder if I thought about it, the same thing might happen to space.

@leonardhevia5452 10 ай бұрын

You're smoking too much weed, Junior.

@rossmeldrum3346 10 ай бұрын

Wouldn't you think that if Time Travel existed, people from the future would already have come back in time and shown us how it's done?

@kilroi22 10 ай бұрын

The method proposed in the video only lets you travel back in time to the point where the time machine started operating, eliminating this objection.

@beenaplumber8379 10 ай бұрын

@@kilroi22 That was only one option. Time travel back to a parallel universe was another. I think we're looking at it from the wrong perspective. 52 years ago I started kindergarten. If I go back 52 years in time, I will be starting kindergarten. If I travel back in time, why would I be watching myself? 52 years ago, that's not what I was actually doing. I was a little boy who was confused by the different names of different colors that looked the same to me. Why should I be anything else if I go back in time? It's just a dimension. In any instant in time, everything is in a fixed position in space. For every position in space I (or anything else) occupy, that represents only one fixed instant in time. Things only appear to change as we move through time. In that instant 52 years ago, I was that little boy, not someone watching that little boy. In this way the laws of physics are preserved in their before/after dimension, just as they are in the remaining dimensions. There is no difference between before and after, only direction, and we are traveling toward the future. That's what we're doing, not the universe. I've heard physicists say it many times, the laws of physics do not prefer a direction of time. Time just exists. It does not run anywhere. As I understand, that's a fundamental principle of general relativity - that we are constantly in motion through the dimension of time, and when we give up motion in one dimension, that momentum is applied to another dimension. That's where we get gravity - our travel through time slows down near massive objects. Therefore, the momentum of that deceleration is applied normal to the massive object, which does not move out of our way as we try to balance our change in our speed through time.

@JiveDadson 10 ай бұрын

Maybe they already have already come, and then read the news and promptly got the hell out of this time and place of abject ignorance and stupidity, perhaps wondering what the hell is a MAGA?

@wanturwife69 11 ай бұрын

I know enough about this subject to be dangerous but by no means have the actual education to speak on it. Therefore, I am asking this very simple question in the hopes that someone who does have the education, can answer it: When the question the video posed about how to take an infinitesimally small Wormhole and expand it open so as to accommodate a human, I instinctively replied in my own mind that negative gravity was necessary (gravity being one of the 4 forces of our known universe, since neither electromagnetism, strong nuclear forces or weak nuclear forces would do the trick). The answer came in the video a few seconds later when it was revealed that negative matter (exotic matter) was needed. This fell hand in glove with my original thought because as I understand it, the more matter an object has, the more mass it possesses, and the more mass it possesses, the more gravity it exerts. I then used a known object (black holes) to construct my "theory" about the impossibility of using an open wormhole for anything other than a light show. Since infinite mass creates a black hole, then wouldn't infinite negative matter (mass) be required to "push" a black hole back open? But in doing so, wouldn't the black hole lose it's properties? Here's what I believe to be the paradox. If one could push a black hole "open" enough to allow passage of an object through it without being spaghettified, wouldn't that feat cause the black hole to return to it's prior state of pre-collapse? And If that is the case, wouldn't "pushing it apart" destroy the very properties that we would be trying to utilize it for? The fact that wormholes are described as extremely tiny (much the same as black holes) tells me that gravity is pulling them inward and warping space and time inside, the same as a black hole. But if you destroy the fabric of a wormhole by pushing it open, would you not also be destroying it's properties that make it useful as a time machine or as a shortcut from point A to point B?

@CaseyDarwin 10 ай бұрын

Worm holes aren't the same as black holes.

@REDPUMPERNICKEL 10 ай бұрын

To the best of my knowledge the nature of the inside of a black hole is unknown so any thoughts that incorporate black hole nature must be speculation.

@ridiculous_gaming 10 ай бұрын

I loved Nova as a kid. If I was actually clever, I would have become a physicist.

@phantomred3553 9 ай бұрын

It's never too late. You can still do it

@ridiculous_gaming 9 ай бұрын

@@phantomred3553 I ended up majoring in biology and have been a science/computer science school teacher for 24 years. Perhaps, I'll delve more into higher level physics after I retire.

@phantomred3553 9 ай бұрын

@ridiculous_gaming Well done. I have a lot of respect for good school teachers, and the world needs more of them

@jasonkinzie8835 9 ай бұрын

15:41 It would have been funny if the wormhole mouth had been lost and the owner had to go through the annoying procedure of tracking it down.

@megamillionfreak 11 ай бұрын

This video needs large amounts of Jack Sarfatti in it, especially his most recent GR and UAP physics work (literally today, 7/27/23 on his Twitter feed).

@spiritzweispirit1st638 10 ай бұрын

We are not worms, - Multi Purpose Dimensional Portals! 🌌

@leonardsavage1162 11 ай бұрын

Time travel will never be possible because none have arrived from the future. If travel was possible or will be possible, the traveler would have been here and everywhere. Since we have not been..visited already means that time travel will never happen in the future.

@kilroi22 11 ай бұрын

For the time machine Kip Thorne proposes, you can only travel back to the time at which the time machine was made. Because we have not made one yet, no time travelers, yet.

@-userJose468 11 ай бұрын

Time travel possible? Please tell me I want to go back please help me

@igorschmidlapp6987 10 ай бұрын

If there are no parallel universes, there is no "Sliders"... ;-P

@NicleT 10 ай бұрын

Didn't Steven Hawkins organized a secret Time-Travelers party where he published the invitation after the event, so the persons from the future would know it and come join him. But since nobody came, it was for him the proof that time traveling is impossible.

@walterulasinksi7031 2 жыл бұрын

Despite the concept of the wormhole in” Contact”, the best part is the Epilogue. Where according to the time measured by the earthbound device as being seconds, the recorder on the protagonist has recorded for 18 hours.

@kilroi22 2 жыл бұрын

Read the ending of the book Contact for an even more amazing conclusion

@serotoninsyndrome 10 ай бұрын

@@kilroi22 "The circle had closed. She had found what she had been searching for."

@robburnside6636 10 ай бұрын

The only form of time travel forward is when something burns. It only works for the thing that is burning.

@beenaplumber8379 10 ай бұрын

Hawking had such a dry wit! I think that's the only reason he lived as long as he did - by seeing the humor in everything. "I wouldn't take a bet against the existence of time machines. My opponent might have seen the future and know the answer." I know he went through hell in grad school and when he was diagnosed, but what a life he made for himself!

@henryjraymondiii961 Жыл бұрын

At 32:20 and slightly prior to that, see the really important concept that few consider. Mark this. Dwell on it! It's GREAT in importance.

@jmleaf8102 10 ай бұрын

Hello, All of the times that I have learned anything about Time Travel, I have never seen nor heard anything about Position. Peace

@philipmcdonagh1094 3 жыл бұрын

if I could go back in time, I would bring a saw with me, go to the garden of Eden cut down that dam apple tree before Adam and Eve had a chance to mess around with it. Its caused nothing but trouble since.

@luckyb4541 2 жыл бұрын

not to worry it never existed. Cute little fable though.

@lisamichels1825 6 ай бұрын

Wait… So the person on the plane is 100,000,000 billionth of a second slower? So you’re saying it is possible!😂

@kilroi22 6 ай бұрын

Yes, we are always traveling into the future but if you move through space you can change the rate at which you travel. If you go 87% the speed of light relative to Earth, you travel into the future at double the rate of Earth!

@ingridfong-daley5899 10 ай бұрын

The photon experiment thing sounds like they discovered the point where, if frequency/wave and particles of matter are separated, they 'rejoin'/rematerialise as two halves of a larger whole. Sounds like a secret to teleportation at the atomic-subatomic threshold.

@klnine 8 ай бұрын

Dr Who did it in 1965 , where has Sagan been?

@scottgreen3807 4 ай бұрын

We do do time travel. This is my third comment and you will experience in REVERSE time order. Not the answer so keep reading.

@John-ci8yk 11 ай бұрын

Sorry for the double comment, by chance do you have an Nova episode on synthetic estrogen and the increasing rates of breast cancer? Thank you.

@GnrMilligan 10 ай бұрын

Heart breaking to see how Sagan looks in this!

@user-cb3lr7jt5p 11 ай бұрын

Time travel to the past seems to be patently regarded as unlikely. But it seems obvious that all parties involved agree that we are traveling into the future (by layman's terms) one second at a time. It seems that before we can work out a way to go back, we need to determine why we are going forward. No coin has one side. If going forward is an accepted fact, then going back must also be an accepted (if currently unknown) fact. Temporal Inertia may be the stumbling block in this regard however.

@REDPUMPERNICKEL 10 ай бұрын

If you imagine that time is a concept only, your subsequent thoughts will solve all related problems.

@snnsarcasticnewsnetwork8007 10 ай бұрын

Time speeds up when my mechanical watch is running fast- and slows down when I don't wind it often- WOW!

@mayamanign 10 ай бұрын

Perceval: “We shall never find it…” 😢

@igorschmidlapp6987 10 ай бұрын

Everybody knows that when you enter a black hole, you emerge from a white hole in a separate universe... ;-P

@owenlaprath4135 8 ай бұрын

... as a spaghetti string - a very, very long and thin and bloody spaghetti string that is :)

@brianmatic539 10 ай бұрын

Wasn’t there a wormhole in Star Trek The Motion Picture (1979)? That’s before Contact, the book.

@kilroi22 10 ай бұрын

Thorne helped Sagan develop a way for one to be used for time travel and space travel.

@owenlaprath4135 8 ай бұрын

No, the only Star Trek wormhole used for travel was the artificially stabilised one in the Deep Space 9 series.

@igorschmidlapp6987 10 ай бұрын

Let's go watch "The Final Countdown" and try to stop Pearl Harbor... ;-)

@RigoVids 2 жыл бұрын

I was gonna ask if that was an aged Carl Sagan in the thumbnail since I’d never seen him that old but damn I was right

@kilroi22 2 жыл бұрын

He was dying from a blood disease at the time. It shocked me when i first saw it too.

@francissaffell6853 11 ай бұрын

What is in an worm hole? It isn't space. It is the absence of space. How do you go through something that can't exist?

@REDPUMPERNICKEL 10 ай бұрын

Some of the most intelligent human beings have some of the driest senses of humor.

@RealStuntPanda 10 ай бұрын

Now we know we can absolutely send information instantaneously using quantum entanglement; quantum computers wouldn't work without this ability.

@ahole5407 7 ай бұрын

😂 to think that someone would make a time machine and you would know about it. The man that controls history controls the world.

@1dgram 11 ай бұрын

Spacetime is flat meaning that traveling through hyperspace isn't a shortcut -- you'd be traveling just as far through the wormhole.

@Mtzrlein 11 ай бұрын

[takes a drag on a bong] what if a Time Machine is a sphere of mirrors in which a person sits (or levitates if it’s in negative gravity) that allow photons in but not out as they’re existing in both forms… could you turn it on and off by simply closing your eyes and opening them?

@REDPUMPERNICKEL 10 ай бұрын

[In loving memory of my last bong hit] yes of course, it's completely obvious.

@ananominity 2 ай бұрын

The newest theory says a black hole may continue to expand infinitely. I wonder what Kip Thorn thinks about the newest theory that says that our universe may be inside a black hole.

@user-qm8bc4bu1t 2 ай бұрын

The fact is we wouldn't know if it still is inside of the black hole or not.

@mycount64 10 ай бұрын

This stuff seems ancient now. Lesson 1. The future is quantum and the past is classical. Everything follows from there. Lesson 2. That basically makes now and the future incompatible yes incompatible with the past Lab 2.1. ie after decoherance Lab 2.2. ie.ie. particles in a quantum state do not exist (the future does not exist) until their probability wave colapses by interacting with other decoherant particles Lab 2.3 ie.ie.i.e. the state of quantum decoherance = the past because they are two completely different states of matter and energy. All of our chemistry experiments were observing reactions before and after they happened. They had no idea of what was happening at the quantum level (lookup quantum chemisty). Now we can experiment to the quantum level including quantum time slices (ok not quantum about 5 to 10 orders of magnitude off) its more accurate than clasical chemistry. Regardless all we see is a classical past and a quantum future. The real question is how long does now last?

@JenniferA.Minnear-Salaza-jb4qf 10 ай бұрын

Size will change to shrink going back in time.

@ericlipps9459 7 ай бұрын

But if the signal travels through the air, it won't really move at the classical speed of light, because it will be slowed by interactions with the atoms/molecules of the air.

@eNigma011 10 ай бұрын

Could we create alternate timelines if we were to travel either forward or backward in time? This might avoid a so called "paradox". We could then "reshape" a future without wars, disease, even aging and death? (At least it's great fodder for science fiction....oh wait, they already did that with the series "Sliders".)

@REDPUMPERNICKEL 10 ай бұрын

Warmest greeting from a friendly stranger... Alternative and alternate are different words with different meanings. It's best to use the word you mean. Time travel is impossible since time is a concept only. Carlo Rovelli's videos about time will convince you of that fact. Cheers, eh!

@Amocles 11 ай бұрын

The look on that scientist face tells me he traveled back to the 1960s and spent too much time in a room full of weird smelling smoke.

@kilroi22 11 ай бұрын

Carl Sagan was dying from myelodysplasia when they made this video. He passed soon after.

@walterulasinksi7031 2 жыл бұрын

Quantum information transmission. Is using hyper wave speeds. A higher frequency than the frequency of light.

@Stevanhale 10 ай бұрын

I like to think that if any one of these scientists stumble on to the secret, it would be apparent the very second they had the right idea. They would be swarmed by time tourists wanting to see the very moment that reverse time travel was solved!

@RealStuntPanda 10 ай бұрын

I'm a time traveler and I can easily teach anyone how to do it right now with this simple exercise: Write down the current time. Wait ten minutes. Write down the current time. Compare the times. You will see that you have now travelled ten minutes into the future. You're welcome.

@eNigma011 10 ай бұрын

I'm sure you know what people are talking about is not "normal" time but accelerated time. Time is a concept we use to measure entropy (2nd law of thermodynamics). It slows as you approach the speed of light relative to "normal" time. It also slows as you approach a huge mass which bends or warps space/time. The effect is the same for much smaller masses but is correspondingly less. People sometimes think that time doesn't exist but I assure you it's very real however our understanding of it leaves much to be desired.

@RealStuntPanda 10 ай бұрын

@@eNigma011 The first rule of Joke Club is you don't explain Joke Club...

@user-me8ot1iw1q 10 ай бұрын

I have a recliner chair like that, sit in it at 1pm ,next thing I know its 2 hours in the future !