It sometimes literally disappoints me to no end how little likes and views his amazing detailed videos get, while stupid memes and like begging videos get millions of likes. Poor Arvin, just 5K likes for such an amazing video.
@@alphagt62 IIRC he said in an earlier video that he got some kind of surgery and was covering up the bandage with the beanie. As of his newest vid looks like it's all healed up!
Only Arvin cool ash can explain it to anyone so easily and with simplicity from 5 year old kid to 92 year old grandpa. From high school student to housewife and to truck driver.
Time travel, in any direction, becomes *_trivial_* once you realize time *_and spatial motion_* are inextricably linked: *v=tUrkmu8Mpas* Then, traveling in time is simply a matter of moving things around. Move the waves & particles your body is made of back to where they were a minute ago, and presto, you've made yourself one minute younger. 😌
@@gwentchamp8720 If many worlds is true, then it would be someone else you're meeting in the past, not yourself. It becomes a moot point then because it wouldn't change *you.*
This is the best video ever. Not only you talk about black hole, but you also talk about the cone of "what can happen" and visuale it! I can understand 2D just fine, but when it comes to 3D, I'm lost. No more sir! Now I can understand exactly! Thank You sir! Amazing work!
When I was 13 I saw a classic movie, one of the greatest movies OF ALL TIME, it was called Revenge of the Nerds and the message was that it's okay to be smart, enjoy science and be a nerd, that lesson paid off because I actually understood everything in this video. I think I'll subscribe now.
Even though I hardly understand this it’s still fun to watch, and u manage to simplify it yet still get across all the key information so I still have some idea what’s happening. Best channel out there!
Arvin, this is mindblowing. The graphs, the visualisation, the way you explain so simple, everything makes you feel weirder that this shit may actually be possible. It feels little bit scarry right now. The universe is such a crazy and weird place
Time travel, in any direction, becomes *_trivial_* once you realize time is not a separate dimension but inextricably linked to *_spatial motion:_* *v=tUrkmu8Mpas* Then, traveling in time is simply a matter of moving things around. Move the waves & particles your body is made of back to where they were a minute ago, and presto, you've made yourself one minute younger. 😌
@@goasthmago6354 Your objection misses my argument. No one's said it would be easy, just _trivial._ There are many trivial things that are incredibly hard to do -- like manually counting every single grain of sand on a beach, for instance. Also, if making yourself younger by 1 minute is too difficult for you, why not start with a simpler task? E.g., try moving the arms of your kitchen clock back by 1 hour. In doing so, you *_will_* actually move the arms back in time. Not completely, since you probably cannot move back every single particle & wave given off by the clock's arms since, but hey: only bite off what you can chew, right? 😉 Of course, the most common objection to this is that moving back the arms of a clock not actually move back time but at most create "the illusion" of moving back in time... *but that isn't true!* Because if you _did_ manage to move back ALL the clock arms' particles etc., the result would be indistinguishable from the result of actually going back in time -- it's a perfect symmetry of time and motion. Two entities/objects indistinguishable in every respect are identical. Thus, the simple act of moving things back into a previous position is identical to moving those things back in time. This does not just go for the sum of ALL the clock arms' particles but also for those you do manage to move back. EVERY spatial motion is a motion in 3D time (see video: *v=tUrkmu8Mpas* ). 😌
@@goasthmago6354 You're just confirming what I'm saying: the perceived direction of time is simply a result of our way of counting it. It's like counting how many miles your car has made: you always only get a *_positive value..._* and yet, when it comes to your car's spatial motion, you do not conclude that it must have been driving all those miles in one direction only, right? No, it's been driving forward, backward, and all around. So why are you assuming the contrary when it comes to time? 😉
Really awesome video, as always! Thanks, Arvin. Just a little minor nit, or perhaps I should say “a missed opportunity”: In your often-shown time-dilation train illustration (time 0:20), perhaps you should also show the train compressed horizontally as well?
@arvin Ash That's the most ridiculously perfect explanation of the terms I've ever seen. Great channel mr. Arvin! I really appreciate your work! Could you tell me what song is playing at 7:38? It really fits the unimaginable things which happens under the even horizon with spacetime itself. Please, I need to know!
Traveling back in time does not mean you can see your grandma, it means particles in you traveled back in time, not the whole universe. This is not going to change molecules in your brain so your memories will be the same. For your grandma to come back life again, the entire universe must travel back in time....
Time is our method of keeping track of earths movement through space. Gravity/velocity doesn't affect "time" it affects the "vibrational" velocity of atomic structure, therefor the concept of moving backwards through time is impossible because we can't reverse the movement of objects through space.
Excellent comment! 100% agree. Of course your statement isn't as entertaining as hypothesizing about going through a wormhole and coming out in a parallel universe through the 8th, 9th or 10th dimension - but I prefer to ponder about the universe we actually have, as opposed the the invented one that is often discussed by science fiction writers - oops I mean physicists. Since GPS technology has demonstrated that time does dilate in gravity and velocity - but doesn't dilate reciprocally for velocity as Einstein theorized, then we can assume that time (and its dilation) is a completely local effect where repeating fundamental behaviors are actually responsible for what we emergently perceive as time, with the slowing rate due to some interaction between the atomic systems and the gravity and/or velocity they are exposed to.
@@keptins no it isn't. Entropy is a different thing entirely, I am not talking about the freedom of movement that atoms have with various energy le els.
@@angryscottishbiker5097 I hear you. I believe travelling back in time is possible as long it means travelling back in space. Also travelling in time is itself an outdated way of expressing an idea. I mean if there is a way to travel in time then there is no point in it. But still in an infinite universe anything is possible. Any thing.
Time is relative not only in "space and time" but also in humans mind. We humans are psychologically bounded by relativity of time. For some depressed person 1 day may equals to week or months, but for other productive people like arvin arsh , it's just blink of an eye. ❤️
What if we could keep going into the past to the point when that black hole was a star , there's a possibility that we don't need naked singularities then right ?
I tried that. The good news is that I could have escaped the gravity to rejoin civilization. The bad news is that my space suit melted and I became my own naked singularity.
If you're inside the event horizon there is no going back. All forward light cones converge to the singularity, it's not a case of "go back until it's not a black hole" you can't go back once you cross the event horizon.
Thank you sir for all your videos. This is the real online education, which should replace the conventional teaching style in our educational institutions.
The problem with "traveling back in time" (to the past), is from past's (and present's) POV, someone from the future would have to already exist to make the trip back.
I've heard it said that gravity is not a real force like magnetism, so negative gravity probably can't happen. I think it's just the effect of a variation in space time density in a local area that causes your feet to "travel" through time faster than your head.. So your feet pull your head. If that's true then to create negative gravity, you would first have to create negative space time, so you would already have the time machine. But I have no idea what I'm talking about 😁
Since gravity is curvature of spacetime that would be a white hole, which is a possible solution to Einstein's GToR. But have not been observed in reality.
What if time travel is invented but its range sucks so it takes a lot of "time" to go back. Like Tenet but instead of going backwards in real time, you go backwards much more slowly than forward. You keep pushing the invention of time travel back bit by bit all the way to the beginning. It would appear like a exponential increase in tech and knowledge into a technological singularity, much like what we see today. Our singularity might be time travel, not AI.
Another problem with the existence of CTCs is that inside realistic rotating black holes , the inner Cauchy horizon , and the regions beyond it , probably do not exist , due to serious instabilities (blueshift/ mass inflation) ,so time travel may not be possible not only for naked singularities , but even inside normal Kerr black holes.
CTCs seem too cool to be true , but ,again ,people had the same attitude about black holes 60 years ago , so who knows? By the way , very good video , as usual.
@Arvin Ash Thank you for showing a visual description of how light cones tilt. It still seems an odd concept because light speed particles don't experience time at all, they are massless, timeless objects existing simultaneously in the past, present and future. I'd assume the origin of a light cone is any object / particle traveling less than the speed of light. I'd love to see a video describing what happens to the perceived time of a person as they walk at a constant speed, relative to a stationary observer in a room simply filled with light. As the speed of light moves constant for everyone regardless of motion through space, and they are both inertial frames, they would perceive an unintuitive experience of time... I'm sure your viewers / myself would love to understand this bizarre concept of how motion through space slows passage through time :-)
Yes, I should have made this clearer. Light cones can represent any particle or object, including you. It just represents all the future and past events that are causally connected to each other.
@@goasthmago6354 Mate that was beautiful. Above and beyond description. Which leads to a more serious question. As you understand this so precisely, do you believe in freewill? Afterall, observing any relative motion is equivalent to observing the past. And of course, the person you're observing also perceives yourself as their past due to the block time of photons surrounding both of you.
Going back to the future is possible. Every atom has vector or trajectory. And if you can find the way to reverse its trajectory then you can in fact go back in time...
Ether was an attempt at explaining electromagnetic force, Higgs is gravity. Ether was part of an earlier understanding of physics, which then adapted through experimental findings, to lead to a more complete and complex explanation.
The Higgs field explains why some particles have mass; if a particle interacts with the Higgs field, it has mass and therefore must travel slower than the speed of light. If it doesn’t interact with the Higgs field then it is massless and can only travel at the speed of light. It isn’t the case, as is often reported in the media, that the Higgs is the source of all mass though; the vast majority of the mass of say a proton comes from the binding energy of the constituent quarks, not Higgs interaction. The luminiferous ether hypothesis posited that light traveled as a wave in a medium (the ether), similar to how sound travels in a medium like air or water. The two concepts aren’t really related.
@@JohnnyAmerique Excellent description of Higgs. I do like the fact that nuclear binding energy is responsible for most of the proton mass. Since E = mc2 - then when fusion or fission create a loss in mass that converts to energy as in a bomb or nuclear reactor, what is really happening is that the emergent measurable property of "mass" is really emergent from the associated energy. So in the end E = E !!! As far as the ether goes however - In reality, each light-generating atom carries electric fields around all of their charged particles and at the moment of light creation, a kink or ripple begins to travel along the electric field as an electromagnetic wave. So in short - each electron involved in generating light is carrying its own personal "ether" before, during and after light propagation.
Really, the only thing they have in common is that they're both supposed to permeate everything. The ether was supposed to carry electromagnetic waves, and the Higgs field doesn't carry electromagnetic waves. The Higgs field is supposed to give particles mass, and the ether wasn't supposed to do that. . And from experiments the Higgs field exists, because Higgs particles seem to have been found, and the ether does not exist. Instead, EM radiation seems to be fluctuations in electromagnetic fields, IIRC.
As usual, you make amazing videos. I have a question. Does light or light photons have mass? If so, how can they trave at the speed of light? If not, how can gravity have an effect on them?
@@ArvinAsh thank you. I would certainly be interested in a detail explanation, in the amazing format you use to create your videos. Why light has a speed, why can't it go faster, and finally, the effects of gravity on energy vs. mass. Again, thank you for your amazing videos.
@@raulc. i think hes already done a couple on this. search arvin's back catalogue of videos. if not you can check out another great physics channel-the science asylum, which you should also be able to grasp. he also uses plenty of visual aids such as graphs. and you dont really need to know the math, theres plenty of conceptual and visual explanation to provide you with intuitive energy and mass are equivalent. you can think of rest mass as confined energy i.e. energy that has been trapped.or since the higgs field provides the rest mass of the fundamental particles that make up all fo hus humans-i.e. electrons and the up and down quarks-which all three make up protons and neutrons-the nuclei of atoms, you can think of electrons and quarks travelling through the higgs field and the field being like thick honey, with the particles struggling to travel through. thus the particles acquite inertia-a resistance to being moved. you and i have rest mass-which is a measure of our resistance to being moved. it is hard to accelerate objects with rest mass. by the time you get to near light speed the difficulty of accelerating the massive object further becomes infinitely difficult i.e. requires infinite energy, and so objects with rest mass/inertial mass cannot reach light speed. light speed is not just the max speed of light but the max speed that anything can travel through the medium of the spacetime continuum. formally this is described by two components-permittivity and permeability. this is-how well space as a medium can conduct electric fields and how well space can conduct magnetic fields. light i.e. visible light is just a tiny part of the electromagnetic wave spectrum. gamma rays, x rays, ultra-violet, visible light. infra red, radiowaves, microwaves. might have missed one out, but thats pretty much the whole spectrum. all are just different frequencies of electromagnetic waves also called radiation, which are composed of an oscilating electric field and an orthogonal oscilating magnetic field, the moving electric field creates the magnetic field, which creates another electric field and so on. so there is a max speed that the medium of space can conduct the electric and magnetic field components of EM waves through it. however more fundamentally it was discovered that gamma rays-the most energetic of EM waves, i.e you would die from exposure to them most certainly,travel exactly same speed as the least energetic of the EM waves-the radio and microwave end of the spectrum which we use in our daily lives e.g. internet, mobile phones, radios, microwave ovens. so the max speed through space has been reached and despite gamma rays having loads extra frequency/energy it doesnt make them go through space any faster. which is very counter intuitive. picture a sprinter going faster over two hundred metres yet not travelling any faster. hence there is a universal speed limit, denoted by the famous algebraic symbol of C, which is a fundamental constant i.e never changes. this C lays the foundation of special relativity where everyone experiences different durations of time and different spatial lengths in their respective reference frames, especially when their acceleration or strength of gravitional field they are in are substantially different relative to their neighbour. this is due to the phenomena of the relativity of simulaneity-one of the three-four key special relativity postulates. Many physicist refer to the constant C-the speed of light, it as the speed of causality. since the limit set by the medium of the space-time continuum plays a fundamental role in causality/events. if you were travelling at the speed of light, all of your movement would be along the space dimensions, and none in the time dimension, so your clock will have stopped. you cease to age, cease to experience time including no more change. photons of light experience no time, their internal clocks are frozen. only stuff with rest mass experiences time, since having rest mass means your angle of movement through the space-time medium has to be tilted at least partly along the time dimension axis. in fact for all of us humans, we move almost exclusively along the time like axis, and barely at all along the space like axis. thus most of us dont even leave this planet, are relatively motionless spatially and thus move through time very quickly and thus do not live very long -eighty-one hundred twenty years is a cosmic blink. we get a tiny time dilation affect from being in the gravity well of the earth.if the speed of light was infinite, a gamma ray burst from a supernovoe one hundred thousand light years away if pointed in the direction of earth would reach earth instantaneoulsy, and we would experience an extinction level event , of ninety five percent of all life going extinct or even worse like the other historic mass extinction events, the last of which happened some hundred million years ago with the big meteor wiping the dinosaurs out, =endong the reptile age, and allowing mammals and thus eventually primates to dominate the landmasses of earth. s o stuff takes durations of time to reach us and us to reach destinations determined by fundamental properties of the spacetime medium/continuum. the geometrical properties of the spacetime bubble we find ourselves in give rise to certain symmetries which initially existed as a ultrs ordered initial state at beginning of universe-like a perfect shape, but then with in particular changes in temperature and density, the symmetries broke , most in fractions of a second after the birth of our universe based on following the math back in time. this three spatial dimension, one time dimension arena is going to determine the allowed behaviours of particles and fields.based on the properties of itself-i.e. the vacuum states permitted to exist. anything that is massless not just light but also gluons which carry the strong nuclear force also travel at C too. just as arvin showed with the space-time diagram, the speeds end up being angles. so light speed is forty five degree angle, and space like speeds are angles beyond forty five degrees, thus they leave our light cone, have become causally disconnected to us, and could go back in time. as the velocities/speeds are angles, light speed in one sense can be said to be infinite, since no steeper angle is permitted geometrically. there is a speculative idea, an interpretation if you will of antimatter as being the backwards in time version of matter. because an electron which for us has negative charge if it did go faster than C/the speed of radiation, it would go backwards in time, and it would appear to us to switch to positive charge i.e. it would look like the antimatter positron. however, i may be wrong in this last point here, but i believe the positron would have negative energy, negative rest mass if it were really going backwards in time. whereas the positrons created in those big particle accelecators at CERN and fermilab and others. all have positive rest mass. so if you want to think of going faster than light, think of negative rest mass, negative energy. and a sort of mirror parallel universe where these faster than light negative rest mass particles and possibly whole big celestial structures would be. such a mirror universe has been proposed seriously. even searched for experimentally, such a mirror opposite side universe would be from our perspective have time running the opposite direction to our arrow of time. and would be located in our past i.e. going further and further away from us towards our past boundary e.g. the big bang. however if you were in that mirror universe, your time would appear to pass in a similar fashion to here. that is just a speculative but fun thought experiment im ending on. though its not ruled out.
@@raulc. ah, thanks mate. Im glad you got something from it. it's admittedly not as perfect a reply as i would have wished to write, as it's speed typed answer/s to your queries, and my mind wanders in an ill disciplined manner, which annoys me, but its generally correct at least. i hold reputation fpr being very detailed and also well known for being the worst at a concise comment!! stay curious. :)
Thank you Arvin for your well presented and intriguing material, I am grateful for the clarity and simplicity of your explanation which provides great insight. I have two questions. First, what are the constituent elements of the "past light cone"" I see that the elements of the future light cone are photons per se, and are the direct result of the switching on of a light source. I am curious as to what constitues the past light cone in terms of "all events in the past that are causally connected to A" This would surely be more than just the behavious of light.. Second question; it seems counter-intuitive, but Kerr-Newman metric suggests that the faster the spin of a black-hole, the weaker the event horizon, until at a fast enough spin the EH mahy be discounted owing to no further measurable gravitational effect.... Counter-intuitive because, generally with higher rotational spin velocity of an object, the greater the gravitational force that is exerted by that object. I will study further, but your material here is exceptional and thank you..
You true, if time is longer, the past is not far. We don't know where we will arrive in the past with Big natural black hole... Here is lying the problem, if you arrive at another place in the past or worse : the black hole birth (then you literally die in, too many gaz and radiations... Maybe a tiny circular singularity), who know ? It's better to get another way of transportation. ;)
It kinda already is. Look at the sky, the light you recieve from stars escaped them thousands of years ago, so you basically see a visual snapshot of how they were at that time.
So near a black hole spacetime is curved to such an extreme degree that the time vertical axis is aligned towards the singularity as a time horizontal axis so that your light cone moves in the direction of said singularity into the future? So all future events in your lightcone is moving towards the singularity? So the singularity directs you into one possible event in time?
The trick would be to move close to the singularity but not directly at it. If moved around in a loop, a closed time-like curve could be created, allowing time travel once you came back out to flat spacetime.
@Zed is dead according to articles on the internet time travel follows Novikov's self consistency principle which forbids changing history and that if you tried, something will stop you from doing so.
If it’s possible to go back in time, I would think there’s a lot more to learn about the way reality works, because there’s got to be something that fixes all the paradoxes it would create.
I don't need for my corporeal being to travel backwards in time. I just need to the ability for my future self to send a light beam back in time with next week's lottery numbers and I'm all set. Now where did I put that naked singularity....
There are two measures of time, one in the conscious and one in the unconscious realms of the mind. For the conscious, time moves at an observable speed. For the unconscious, time travels into the future at a yet to be determined speed. Most likely Instantaneously. For example, to a person waking from a 20 year coma, their minds feel like the 20 years had passed by like an afternoon nap, therefore they have experienced Time Travel. While those conscious would have experienced the full 20 years day by day. This means that the only way to experience true "Time Travel" One must be in an unconscious state of mind, either in suspended animation or dead, from the perspective of the living.
How does one go about the problem of entropy reversal that comes with the backwards time travel? Can we return to the same "point" in entropy itself to have an equal footing in the past with same entropy?
There are a few things you should know. 1. you have to find the black hole - maybe 6 years away from ears lighyears I mean you must calculate relative time...than you could I choose my right time I would like got in the past ?? So how Long must I be in the black hole...maybe you can escape from event horizon gravity - how can I choose my right time ??
When discussing time dilation I never see reference to energy conservation for the time piece itself. You have a closed system that has a finite energy source. Increase the mass the time piece is going to slow. So is time really slowing or just the time piece?
Arvin Ash the singularity is a circular dot of infinite density. If you go in a enough large black hole you don't turn around in going in being stationary or end up of your entry beginning, you simply travel the ringularity by the center and probably goes in the past.... Time doesn't accelerate near a BH Now we don't know if : you arrive in the past where black hole formed, or was still tiny (dangerous) or if you don't get out in another place in the same universe, that's it's due to expansion and black hole motion off course... The best is to enter in a controled BH, you know where is the black hole 1a and black hole 1b, in the same space or time. Natural black, when they are Big are still belonging to uncertainity of arrival. However, in time, well the past for sure.
This is the coolest video I've seen this year. Think about it. We've got hundreds of millions of years of sun left. We're only 200,000 years old as a species. In short we've got plenty of time to discover all manner of stuff. The end isn't anywhere close to being nigh. Imagine where we could be in 1000 years. 10000 years. There's almost no imagining how amazing the future could be. We have no need of fearing a cold dark nihilistic universe. We're just getting started. Time is on our side. We have plenty of time to explore, understand and enjoy the universe.👍🏿
Since the motion is relative, are there solutions where the naked black hole follows a trajectory such that it goes around your spaceship, rather than you travelling in that spiral trajectory you depicted? If so, perhaps you could have a future space station where a black hole orbits it and you could travel back in time by going to the space station.
That's a very interesting thought. I think the problem would be that you have to be able to get real close to the singularity and then come back out to achieve this. But if it is orbiting at the same distance, then you would just be going around the loop, not coming back to where you started outside the singularity.
For me to have the ability to travel backwards in time and set forth motions to prevent my own birth is to put the effect (me), before my birth (cause). - Unkown Causality cannot be compromised, therefore backward time travel is absolutely not possible. You can’t say “but what if we did nothing, and just observed.” It doesn’t work that way. The mere ability to disrupt causality is the issue, not if you actually do it. Now watching the light from the past, where you aren’t a participant that could alter or change the past, that’s plausible. Just move away from the light source and you can watch the past, but you could never interact with the past on a level that could potentially affect causality. Forward travel Thru time is not really time travel, it’s just following the natural forward progression of time - it’s just some are traveling thru space at a faster or slower rate than objects in different parts of the universe. So forward time travel is just the comparison of two different objects “now time” relative to how fast they are traveling thru space.
It's really quite simple to move backward through time. Just accelerate toward a strong source of gravity at close to the speed of light in it's reference frame. A singularity would be ideal, as long as the space ship only skims the event horizon. You'll exit the manoeuvre just slightly fast enough to turn around and watch yourself begin the manoeuvre in your new reference frame.
To "see", not to "experience". You can do the same with a Sony videocamera. Not exactly time travel. Using gravity to snapshot an image does not qualify.
@@NeonVisual I'm not sure who is drunk here... Skimming a singularity allows you to see your past emitted photons, it does not allow you to travel backwards in time. You can interact with those emitted photons, but they are now in your present, and interacting with them does not change your present. As long as causality is not broken you have not traveled backwards in time. It is similar to video editing a footage of yourself and calling it backward time travel. Actually it is more akin to travelling forward in time faster than the speed of light without breaking causality - like a plane that breaks the speed of sound could go in a loop to hear its own sound boom - but preventing that sound boom from ever happening will not affect your present in that plane, it still did happen.
When I think about traveling into the past I imagine that as soon as I start to go backwards in time, another me would have to be created instantaneously. Either that, or the me from the past time period I was traveling to would cease to exist. The only way for it to be physically possible would be if I were to quickly relive all my past experiences in reverse. And this would have to go on until I reach the past time period I wanted to get to.
Arvin the goat. Hands down most underrated youtuber in existence. Dope beanie too
What’s with the wardrobe though? Like, seriously, dude needs to be on an episode of, “What Not To Wear.” 😂
Must have been a bad hair day?
It sometimes literally disappoints me to no end how little likes and views his amazing detailed videos get, while stupid memes and like begging videos get millions of likes. Poor Arvin, just 5K likes for such an amazing video.
Very nice pfp bro
@@alphagt62 IIRC he said in an earlier video that he got some kind of surgery and was covering up the bandage with the beanie. As of his newest vid looks like it's all healed up!
Only Arvin cool ash can explain it to anyone so easily and with simplicity from 5 year old kid to 92 year old grandpa. From high school student to housewife and to truck driver.
Man that must be a smart 5 year old.
Brian green literally does that from age 5-experts
“So you’re telling me there’s a chance...”
Bingo!
@Portal Opener it will take me time to read and understand what u wrote, but hey! I am just impressed!
@@Yashraj13 its gibberish from a looney
@@fitnesspoint2006 probably a junkie
@@Yashraj13 I wouldn't bother, it's all technobabble
Wish I could watch this live then go back in time to do my work.
lol I would eat cake & then go back in time & still have my cake. Would we get stuck in a time loop though? I think I might.
It would be like the anime “Harumi suzumia ”
There is a chance......
Time travel, in any direction, becomes *_trivial_* once you realize time *_and spatial motion_* are inextricably linked: *v=tUrkmu8Mpas* Then, traveling in time is simply a matter of moving things around. Move the waves & particles your body is made of back to where they were a minute ago, and presto, you've made yourself one minute younger. 😌
Don't we all!
I want to travel back in time and meet my younger self so I can give him a swift kick in the arse.
nothing like a good ole self arse kicking, eh?
or some money when needed it the most
Unless you remember already meeting your older self in the past, it's not going to happen in the future.
@@wasd____ Not true according to the many worlds interpretation.
@@gwentchamp8720 If many worlds is true, then it would be someone else you're meeting in the past, not yourself. It becomes a moot point then because it wouldn't change *you.*
I get chills when you say ‘Coming up right now’ and the music starts
This channel is just a gold mine, love your videos.❤️
There is no chance
“This is not so straightforward”: kudos writing staff. 🎯
Grin on Arvins face when he told there might be a chance,,
Well, maybe HE came back in time ;-)
This is the best video ever. Not only you talk about black hole, but you also talk about the cone of "what can happen" and visuale it! I can understand 2D just fine, but when it comes to 3D, I'm lost. No more sir! Now I can understand exactly! Thank You sir! Amazing work!
I think you should say, " Magellan TV, Yesterday's sponsor, Today's sponsor, tomorrow's sponsor, everyday's sponsor" #sponsorforever
Phenomenal work man, Arvin is working magic!
This channel is just amazing. Here the more complex concepts are well explained, but without losing their richness. Thanks for the excellent job.
Subbed. Thanks for explaining the 45degree angle of light because that was something I never understood. Cheers.
I love the optimism, we need more of it.
🥺❤️❤️
Changing the perspective to looking "down" into the singularity at 12:55 made it click. Thank you. Great video. :)
Amazing as always!
When I was 13 I saw a classic movie, one of the greatest movies OF ALL TIME, it was called Revenge of the Nerds and the message was that it's okay to be smart, enjoy science and be a nerd, that lesson paid off because I actually understood everything in this video. I think I'll subscribe now.
Even though I hardly understand this it’s still fun to watch, and u manage to simplify it yet still get across all the key information so I still have some idea what’s happening. Best channel out there!
Arvin, this is mindblowing. The graphs, the visualisation, the way you explain so simple, everything makes you feel weirder that this shit may actually be possible. It feels little bit scarry right now. The universe is such a crazy and weird place
Excellent video, as always. Very interesting, informative and worthwhile video.
What a Knockout video. Tremendous stuff... many thanks.
Fingers crossed for the ability to travel back in time.
Plans to build a TARDIS next please!
🤗
"I was so much older then, I'm younger than that now"
Time travel, in any direction, becomes *_trivial_* once you realize time is not a separate dimension but inextricably linked to *_spatial motion:_* *v=tUrkmu8Mpas* Then, traveling in time is simply a matter of moving things around. Move the waves & particles your body is made of back to where they were a minute ago, and presto, you've made yourself one minute younger. 😌
you´re right Bob Dylan
@@miguelo65 Good for you Miguelo. I was beginning to wonder where Bob's fans were on this channel.
@@goasthmago6354 Your objection misses my argument. No one's said it would be easy, just _trivial._ There are many trivial things that are incredibly hard to do -- like manually counting every single grain of sand on a beach, for instance. Also, if making yourself younger by 1 minute is too difficult for you, why not start with a simpler task? E.g., try moving the arms of your kitchen clock back by 1 hour. In doing so, you *_will_* actually move the arms back in time. Not completely, since you probably cannot move back every single particle & wave given off by the clock's arms since, but hey: only bite off what you can chew, right? 😉 Of course, the most common objection to this is that moving back the arms of a clock not actually move back time but at most create "the illusion" of moving back in time... *but that isn't true!* Because if you _did_ manage to move back ALL the clock arms' particles etc., the result would be indistinguishable from the result of actually going back in time -- it's a perfect symmetry of time and motion. Two entities/objects indistinguishable in every respect are identical. Thus, the simple act of moving things back into a previous position is identical to moving those things back in time. This does not just go for the sum of ALL the clock arms' particles but also for those you do manage to move back. EVERY spatial motion is a motion in 3D time (see video: *v=tUrkmu8Mpas* ). 😌
@@goasthmago6354 You're just confirming what I'm saying: the perceived direction of time is simply a result of our way of counting it. It's like counting how many miles your car has made: you always only get a *_positive value..._* and yet, when it comes to your car's spatial motion, you do not conclude that it must have been driving all those miles in one direction only, right? No, it's been driving forward, backward, and all around. So why are you assuming the contrary when it comes to time? 😉
Really awesome video, as always! Thanks, Arvin.
Just a little minor nit, or perhaps I should say “a missed opportunity”: In your often-shown time-dilation train illustration (time 0:20), perhaps you should also show the train compressed horizontally as well?
@arvin Ash That's the most ridiculously perfect explanation of the terms I've ever seen. Great channel mr. Arvin! I really appreciate your work! Could you tell me what song is playing at 7:38? It really fits the unimaginable things which happens under the even horizon with spacetime itself. Please, I need to know!
Traveling back in time does not mean you can see your grandma, it means particles in you traveled back in time, not the whole universe. This is not going to change molecules in your brain so your memories will be the same. For your grandma to come back life again, the entire universe must travel back in time....
"Traveling back in time is not so straight forward" so many lolz here! :D
Consistently brilliant videos. I am so glad you make them, and thank you
Can I travel to the future and watch this instead of waiting 😂
No point of watching this if you can travel
Look at me! Back at you! You are in the future now!
@@UnchartedWorlds I will make one comment after 15min so before that time tell me what m I gonna comment
You won't notice any difference since sequencially you watched it 😂
You can't skip time
Deep
I can safely say that this is the best science channel on you tube. Great work. 🤩👍👍
Time is our method of keeping track of earths movement through space. Gravity/velocity doesn't affect "time" it affects the "vibrational" velocity of atomic structure, therefor the concept of moving backwards through time is impossible because we can't reverse the movement of objects through space.
Great point, spot on!
Excellent comment! 100% agree. Of course your statement isn't as entertaining as hypothesizing about going through a wormhole and coming out in a parallel universe through the 8th, 9th or 10th dimension - but I prefer to ponder about the universe we actually have, as opposed the the invented one that is often discussed by science fiction writers - oops I mean physicists.
Since GPS technology has demonstrated that time does dilate in gravity and velocity - but doesn't dilate reciprocally for velocity as Einstein theorized, then we can assume that time (and its dilation) is a completely local effect where repeating fundamental behaviors are actually responsible for what we emergently perceive as time, with the slowing rate due to some interaction between the atomic systems and the gravity and/or velocity they are exposed to.
Thats a long and fancy way of saying "entropy" lol. I am pretty sure Arvin and all those fancy physicists know about the entropy.
@@keptins no it isn't. Entropy is a different thing entirely, I am not talking about the freedom of movement that atoms have with various energy le els.
@@angryscottishbiker5097 I hear you. I believe travelling back in time is possible as long it means travelling back in space. Also travelling in time is itself an outdated way of expressing an idea. I mean if there is a way to travel in time then there is no point in it. But still in an infinite universe anything is possible. Any thing.
Astounding explanations !
Time is relative not only in "space and time" but also in humans mind. We humans are psychologically bounded by relativity of time. For some depressed person 1 day may equals to week or months, but for other productive people like arvin arsh , it's just blink of an eye. ❤️
Great video this week. This time travel subject is very interesting.
What if we could keep going into the past to the point when that black hole was a star , there's a possibility that we don't need naked singularities then right ?
I tried that. The good news is that I could have escaped the gravity to rejoin civilization. The bad news is that my space suit melted and I became my own naked singularity.
this is an interesting idea, many things I can think of would arise as issues, but yes, I want to hear more about this idea...
Thanks a lot both of u for thinking about the idea
Well we could go even more in the past to the point when it didn't even exist
If you're inside the event horizon there is no going back. All forward light cones converge to the singularity, it's not a case of "go back until it's not a black hole" you can't go back once you cross the event horizon.
Thank you sir for all your videos. This is the real online education, which should replace the conventional teaching style in our educational institutions.
You are such a BECONE of Knowledge I always Like your videos
as always excellent video, thank you
The problem with "traveling back in time" (to the past), is from past's (and present's) POV, someone from the future would have to already exist to make the trip back.
I love you walking through and explaining the math formulas
Is it possible to create negative gravity? If so, how would that affect time?
I've heard it said that gravity is not a real force like magnetism, so negative gravity probably can't happen. I think it's just the effect of a variation in space time density in a local area that causes your feet to "travel" through time faster than your head.. So your feet pull your head. If that's true then to create negative gravity, you would first have to create negative space time, so you would already have the time machine. But I have no idea what I'm talking about 😁
@@jameshughes3014 no no your close if you take the relativity explanation of gravity your right
Since gravity is curvature of spacetime that would be a white hole, which is a possible solution to Einstein's GToR. But have not been observed in reality.
@@matthewcahill4475 huh, cool. Thanks , wasn't sure I understood it
Define "negative" gravity.
Very well explained...you r true to your words simplifying complex things.. Cheers
Excellent video as usual!! I'd love to hear your thoughts about Dr. Mallett's work relating to this.
Great finishing remarks! Straight to the point.
If time travel ever happens, it always does.
🔥
Unless it causes a recursion loop. Then If we can we can’t... Science is neat isn’t it?
What if time travel is invented but its range sucks so it takes a lot of "time" to go back. Like Tenet but instead of going backwards in real time, you go backwards much more slowly than forward. You keep pushing the invention of time travel back bit by bit all the way to the beginning. It would appear like a exponential increase in tech and knowledge into a technological singularity, much like what we see today. Our singularity might be time travel, not AI.
That depends on your idea of what a "time travel" is.
That would mean we’ve already came in contact with time travelers
Thanks for the chapters
Another problem with the existence of CTCs is that inside realistic rotating black holes , the inner Cauchy horizon , and the regions beyond it , probably do not exist , due to serious instabilities (blueshift/ mass inflation) ,so time travel may not be possible not only for naked singularities , but even inside normal Kerr black holes.
Yes, that is possible. The equations seem to work, but like you said, real singularities may impose further barriers.
CTCs seem too cool to be true , but ,again ,people had the same attitude about black holes 60 years ago , so who knows?
By the way , very good video , as usual.
I actually got a grasp of all you were saying.
You are a great teacher.
@Arvin Ash Thank you for showing a visual description of how light cones tilt. It still seems an odd concept because light speed particles don't experience time at all, they are massless, timeless objects existing simultaneously in the past, present and future. I'd assume the origin of a light cone is any object / particle traveling less than the speed of light.
I'd love to see a video describing what happens to the perceived time of a person as they walk at a constant speed, relative to a stationary observer in a room simply filled with light. As the speed of light moves constant for everyone regardless of motion through space, and they are both inertial frames, they would perceive an unintuitive experience of time... I'm sure your viewers / myself would love to understand this bizarre concept of how motion through space slows passage through time :-)
Yes, I should have made this clearer. Light cones can represent any particle or object, including you. It just represents all the future and past events that are causally connected to each other.
@@goasthmago6354 Mate that was beautiful. Above and beyond description. Which leads to a more serious question. As you understand this so precisely, do you believe in freewill? Afterall, observing any relative motion is equivalent to observing the past. And of course, the person you're observing also perceives yourself as their past due to the block time of photons surrounding both of you.
Very nicely explained. Great job
Going back to the future is possible. Every atom has vector or trajectory. And if you can find the way to reverse its trajectory then you can in fact go back in time...
I'll see you in the previous video, my friend!
Time travelling is my next business venture.
I can't wait to see you in the next video my friend
how’s Higgs field different from “ether” that was described during Newtonian era ?
Ether was an attempt at explaining electromagnetic force, Higgs is gravity. Ether was part of an earlier understanding of physics, which then adapted through experimental findings, to lead to a more complete and complex explanation.
Do u mean that you want this Answered in a vid
The Higgs field explains why some particles have mass; if a particle interacts with the Higgs field, it has mass and therefore must travel slower than the speed of light. If it doesn’t interact with the Higgs field then it is massless and can only travel at the speed of light. It isn’t the case, as is often reported in the media, that the Higgs is the source of all mass though; the vast majority of the mass of say a proton comes from the binding energy of the constituent quarks, not Higgs interaction.
The luminiferous ether hypothesis posited that light traveled as a wave in a medium (the ether), similar to how sound travels in a medium like air or water. The two concepts aren’t really related.
@@JohnnyAmerique Excellent description of Higgs. I do like the fact that nuclear binding energy is responsible for most of the proton mass. Since E = mc2 - then when fusion or fission create a loss in mass that converts to energy as in a bomb or nuclear reactor, what is really happening is that the emergent measurable property of "mass" is really emergent from the associated energy. So in the end E = E !!!
As far as the ether goes however - In reality, each light-generating atom carries electric fields around all of their charged particles and at the moment of light creation, a kink or ripple begins to travel along the electric field as an electromagnetic wave. So in short - each electron involved in generating light is carrying its own personal "ether" before, during and after light propagation.
Really, the only thing they have in common is that they're both supposed to permeate everything. The ether was supposed to carry electromagnetic waves, and the Higgs field doesn't carry electromagnetic waves. The Higgs field is supposed to give particles mass, and the ether wasn't supposed to do that. . And from experiments the Higgs field exists, because Higgs particles seem to have been found, and the ether does not exist. Instead, EM radiation seems to be fluctuations in electromagnetic fields, IIRC.
Excellent video! As long as we still have a chance it’s worth to keep searching.
The moment he says «right now» is when you have to wait.
Very clear. Great work.
As usual, you make amazing videos. I have a question.
Does light or light photons have mass? If so, how can they trave at the speed of light? If not, how can gravity have an effect on them?
Photons do not have a rest mass. However, they do have energy. They do curve spacetime. Mass and energy curve spacetime.
@@ArvinAsh thank you. I would certainly be interested in a detail explanation, in the amazing format you use to create your videos.
Why light has a speed, why can't it go faster, and finally, the effects of gravity on energy vs. mass. Again, thank you for your amazing videos.
@@raulc. i think hes already done a couple on this. search arvin's back catalogue of videos. if not you can check out another great physics channel-the science asylum, which you should also be able to grasp. he also uses plenty of visual aids such as graphs. and you dont really need to know the math, theres plenty of conceptual and visual explanation to provide you with intuitive energy and mass are equivalent. you can think of rest mass as confined energy i.e. energy that has been trapped.or since the higgs field provides the rest mass of the fundamental particles that make up all fo hus humans-i.e. electrons and the up and down quarks-which all three make up protons and neutrons-the nuclei of atoms, you can think of electrons and quarks travelling through the higgs field and the field being like thick honey, with the particles struggling to travel through. thus the particles acquite inertia-a resistance to being moved. you and i have rest mass-which is a measure of our resistance to being moved. it is hard to accelerate objects with rest mass. by the time you get to near light speed the difficulty of accelerating the massive object further becomes infinitely difficult i.e. requires infinite energy, and so objects with rest mass/inertial mass cannot reach light speed. light speed is not just the max speed of light but the max speed that anything can travel through the medium of the spacetime continuum. formally this is described by two components-permittivity and permeability. this is-how well space as a medium can conduct electric fields and how well space can conduct magnetic fields. light i.e. visible light is just a tiny part of the electromagnetic wave spectrum. gamma rays, x rays, ultra-violet, visible light. infra red, radiowaves, microwaves. might have missed one out, but thats pretty much the whole spectrum. all are just different frequencies of electromagnetic waves also called radiation, which are composed of an oscilating electric field and an orthogonal oscilating magnetic field, the moving electric field creates the magnetic field, which creates another electric field and so on. so there is a max speed that the medium of space can conduct the electric and magnetic field components of EM waves through it. however more fundamentally it was discovered that gamma rays-the most energetic of EM waves, i.e you would die from exposure to them most certainly,travel exactly same speed as the least energetic of the EM waves-the radio and microwave end of the spectrum which we use in our daily lives e.g. internet, mobile phones, radios, microwave ovens. so the max speed through space has been reached and despite gamma rays having loads extra frequency/energy it doesnt make them go through space any faster. which is very counter intuitive. picture a sprinter going faster over two hundred metres yet not travelling any faster. hence there is a universal speed limit, denoted by the famous algebraic symbol of C, which is a fundamental constant i.e never changes. this C lays the foundation of special relativity where everyone experiences different durations of time and different spatial lengths in their respective reference frames, especially when their acceleration or strength of gravitional field they are in are substantially different relative to their neighbour. this is due to the phenomena of the relativity of simulaneity-one of the three-four key special relativity postulates.
Many physicist refer to the constant C-the speed of light, it as the speed of causality. since the limit set by the medium of the space-time continuum plays a fundamental role in causality/events. if you were travelling at the speed of light, all of your movement would be along the space dimensions, and none in the time dimension, so your clock will have stopped. you cease to age, cease to experience time including no more change. photons of light experience no time, their internal clocks are frozen. only stuff with rest mass experiences time, since having rest mass means your angle of movement through the space-time medium has to be tilted at least partly along the time dimension axis. in fact for all of us humans, we move almost exclusively along the time like axis, and barely at all along the space like axis. thus most of us dont even leave this planet, are relatively motionless spatially and thus move through time very quickly and thus do not live very long -eighty-one hundred twenty years is a cosmic blink. we get a tiny time dilation affect from being in the gravity well of the earth.if the speed of light was infinite, a gamma ray burst from a supernovoe one hundred thousand light years away if pointed in the direction of earth would reach earth instantaneoulsy, and we would experience an extinction level event , of ninety five percent of all life going extinct or even worse like the other historic mass extinction events, the last of which happened some hundred million years ago with the big meteor wiping the dinosaurs out, =endong the reptile age, and allowing mammals and thus eventually primates to dominate the landmasses of earth. s
o stuff takes durations of time to reach us and us to reach destinations determined by fundamental properties of the spacetime medium/continuum. the geometrical properties of the spacetime bubble we find ourselves in give rise to certain symmetries which initially existed as a ultrs ordered initial state at beginning of universe-like a perfect shape, but then with in particular changes in temperature and density, the symmetries broke , most in fractions of a second after the birth of our universe based on following the math back in time. this three spatial dimension, one time dimension arena is going to determine the allowed behaviours of particles and fields.based on the properties of itself-i.e. the vacuum states permitted to exist. anything that is massless not just light but also gluons which carry the strong nuclear force also travel at C too. just as arvin showed with the space-time diagram, the speeds end up being angles. so light speed is forty five degree angle, and space like speeds are angles beyond forty five degrees, thus they leave our light cone, have become causally disconnected to us, and could go back in time. as the velocities/speeds are angles, light speed in one sense can be said to be infinite, since no steeper angle is permitted geometrically. there is a speculative idea, an interpretation if you will of antimatter as being the backwards in time version of matter. because an electron which for us has negative charge if it did go faster than C/the speed of radiation, it would go backwards in time, and it would appear to us to switch to positive charge i.e. it would look like the antimatter positron. however, i may be wrong in this last point here, but i believe the positron would have negative energy, negative rest mass if it were really going backwards in time. whereas the positrons created in those big particle accelecators at CERN and fermilab and others. all have positive rest mass. so if you want to think of going faster than light, think of negative rest mass, negative energy. and a sort of mirror parallel universe where these faster than light negative rest mass particles and possibly whole big celestial structures would be. such a mirror universe has been proposed seriously. even searched for experimentally, such a mirror opposite side universe would be from our perspective have time running the opposite direction to our arrow of time. and would be located in our past i.e. going further and further away from us towards our past boundary e.g. the big bang. however if you were in that mirror universe, your time would appear to pass in a similar fashion to here. that is just a speculative but fun thought experiment im ending on. though its not ruled out.
@@shaunhumphreys6714 wow... That was a very detailed explanation. I have to be honest, I enjoyed reading it. Thank you.
@@raulc. ah, thanks mate. Im glad you got something from it. it's admittedly not as perfect a reply as i would have wished to write, as it's speed typed answer/s to your queries, and my mind wanders in an ill disciplined manner, which annoys me, but its generally correct at least. i hold reputation fpr being very detailed and also well known for being the worst at a concise comment!! stay curious. :)
Thank you Arvin for your well presented and intriguing material, I am grateful for the clarity and simplicity of your explanation which provides great insight. I have two questions. First, what are the constituent elements of the "past light cone"" I see that the elements of the future light cone are photons per se, and are the direct result of the switching on of a light source. I am curious as to what constitues the past light cone in terms of "all events in the past that are causally connected to A" This would surely be more than just the behavious of light.. Second question; it seems counter-intuitive, but Kerr-Newman metric suggests that the faster the spin of a black-hole, the weaker the event horizon, until at a fast enough spin the EH mahy be discounted owing to no further measurable gravitational effect.... Counter-intuitive because, generally with higher rotational spin velocity of an object, the greater the gravitational force that is exerted by that object. I will study further, but your material here is exceptional and thank you..
5:30
How fast is that person walking to nearly keep up with a train moving at 0.5c? 🤔
He’s walking at normal speed. It’s just a yuge train a long way away.
As usual loved the video. They are getting better!
I bet that stock footage guy wishes he could travel to the past and get a better costume
You true, if time is longer, the past is not far.
We don't know where we will arrive in the past with Big natural black hole... Here is lying the problem, if you arrive at another place in the past or worse : the black hole birth (then you literally die in, too many gaz and radiations... Maybe a tiny circular singularity), who know ?
It's better to get another way of transportation. ;)
lol that costume was perfection
That “costume” you speak of is a standard NASA timeflight chrononaut uniform.
Yea pretty cringe
Such an amazing & wonderful vid!
I'm addicted to these videos but my brain is like the anti-blackhole. Nothing goes in. 😆
So your brain is a white hole.
Love these videos bro!!
I like to think that time travel could be possible as long as the end result and starting condition stays the same.
It kinda already is.
Look at the sky, the light you recieve from stars escaped them thousands of years ago, so you basically see a visual snapshot of how they were at that time.
Amazing Ash.
"Divide by 0" *angry math class noises*
Just Awesome !!!
Brilliant video !!!
I am theoretically time travelling through time right now, theoretically!
except your position at the present moment in reference to time in relation to your position remains in a constant fixed present moment in time
@@tonygilbert73 oh with the tick mark I thought you were a verified TH-camr with more than 100K subs or so
Love your content so so much!
Don't give me hope to study for my last year's offline exam which i thought will be online
So near a black hole spacetime is curved to such an extreme degree that the time vertical axis is aligned towards the singularity as a time horizontal axis so that your light cone moves in the direction of said singularity into the future?
So all future events in your lightcone is moving towards the singularity?
So the singularity directs you into one possible event in time?
The trick would be to move close to the singularity but not directly at it. If moved around in a loop, a closed time-like curve could be created, allowing time travel once you came back out to flat spacetime.
If we can go back to past, can we change history. Or does history remains fixed like harry potter series?
@Zed is dead according to articles on the internet time travel follows Novikov's self consistency principle which forbids changing history and that if you tried, something will stop you from doing so.
If it’s possible to go back in time, I would think there’s a lot more to learn about the way reality works, because there’s got to be something that fixes all the paradoxes it would create.
U think paradohex to heal themselfs?
@@filipvasilevski8115 they wouldn't exist in the first place
@@vibaj16 hope u right .
I don't need for my corporeal being to travel backwards in time. I just need to the ability for my future self to send a light beam back in time with next week's lottery numbers and I'm all set. Now where did I put that naked singularity....
Hopefully you never find it. Causality is very cool. Madness is not.
I wish Adolph best luck 🍀 to go back in time to take care my foster father
technically, we are all time traveling because time zones exist
Hello Arvind,can you make video about symmetry in physical laws
Nice idea. Thanks for the suggestion.
Most exciting moment while watching this video... Let's take a look, (background music) coming up right now
Thanks for the vid! If I could go back in time to 7:00, I'd make the graph and subsequent equations agree by interchanging φ and θ somewhere :)
There are two measures of time, one in the conscious and one in the unconscious realms of the mind. For the conscious, time moves at an observable speed. For the unconscious, time travels into the future at a yet to be determined speed. Most likely Instantaneously. For example, to a person waking from a 20 year coma, their minds feel like the 20 years had passed by like an afternoon nap, therefore they have experienced Time Travel. While those conscious would have experienced the full 20 years day by day. This means that the only way to experience true "Time Travel" One must be in an unconscious state of mind, either in suspended animation or dead, from the perspective of the living.
How does one go about the problem of entropy reversal that comes with the backwards time travel? Can we return to the same "point" in entropy itself to have an equal footing in the past with same entropy?
There are a few things you should know. 1. you have to find the black hole - maybe 6 years away from ears lighyears I mean you must calculate relative time...than you could I choose my right time I would like got in the past ?? So how Long must I be in the black hole...maybe you can escape from event horizon gravity - how can I choose my right time ??
When discussing time dilation I never see reference to energy conservation for the time piece itself. You have a closed system that has a finite energy source. Increase the mass the time piece is going to slow. So is time really slowing or just the time piece?
This channel is underrated !
Yeah it's so sad stupid meme videos get over a million likes while such complex videos with so much hard work get only thousands of likes
Wow super, you are great 🙏🙏🙏🙏
Arvin Ash the singularity is a circular dot of infinite density. If you go in a enough large black hole you don't turn around in going in being stationary or end up of your entry beginning, you simply travel the ringularity by the center and probably goes in the past.... Time doesn't accelerate near a BH Now we don't know if : you arrive in the past where black hole formed, or was still tiny (dangerous) or if you don't get out in another place in the same universe, that's it's due to expansion and black hole motion off course...
The best is to enter in a controled BH, you know where is the black hole 1a and black hole 1b, in the same space or time.
Natural black, when they are Big are still belonging to uncertainity of arrival. However, in time, well the past for sure.
It's one of your best videos
Loved itttt💯💯🙏🙏✨✨
I love his explanation and voice
This is the coolest video I've seen this year. Think about it. We've got hundreds of millions of years of sun left. We're only 200,000 years old as a species. In short we've got plenty of time to discover all manner of stuff. The end isn't anywhere close to being nigh. Imagine where we could be in 1000 years. 10000 years. There's almost no imagining how amazing the future could be. We have no need of fearing a cold dark nihilistic universe. We're just getting started. Time is on our side. We have plenty of time to explore, understand and enjoy the universe.👍🏿
Don’t know about you but I’m afraid I won’t be around in 1000 years
Didn't expect this on a friday morning. Nice
Since the motion is relative, are there solutions where the naked black hole follows a trajectory such that it goes around your spaceship, rather than you travelling in that spiral trajectory you depicted? If so, perhaps you could have a future space station where a black hole orbits it and you could travel back in time by going to the space station.
That's a very interesting thought. I think the problem would be that you have to be able to get real close to the singularity and then come back out to achieve this. But if it is orbiting at the same distance, then you would just be going around the loop, not coming back to where you started outside the singularity.
Great ideas i love your topics
For me to have the ability to travel backwards in time and set forth motions to prevent my own birth is to put the effect (me), before my birth (cause). - Unkown
Causality cannot be compromised, therefore backward time travel is absolutely not possible. You can’t say “but what if we did nothing, and just observed.” It doesn’t work that way. The mere ability to disrupt causality is the issue, not if you actually do it.
Now watching the light from the past, where you aren’t a participant that could alter or change the past, that’s plausible. Just move away from the light source and you can watch the past, but you could never interact with the past on a level that could potentially affect causality.
Forward travel Thru time is not really time travel, it’s just following the natural forward progression of time - it’s just some are traveling thru space at a faster or slower rate than objects in different parts of the universe.
So forward time travel is just the comparison of two different objects “now time” relative to how fast they are traveling thru space.
Arvin you may be the best in this business
It's really quite simple to move backward through time. Just accelerate toward a strong source of gravity at close to the speed of light in it's reference frame. A singularity would be ideal, as long as the space ship only skims the event horizon. You'll exit the manoeuvre just slightly fast enough to turn around and watch yourself begin the manoeuvre in your new reference frame.
To "see", not to "experience". You can do the same with a Sony videocamera. Not exactly time travel. Using gravity to snapshot an image does not qualify.
@@marsovac You drunk bro?
@@NeonVisual I'm not sure who is drunk here... Skimming a singularity allows you to see your past emitted photons, it does not allow you to travel backwards in time. You can interact with those emitted photons, but they are now in your present, and interacting with them does not change your present. As long as causality is not broken you have not traveled backwards in time. It is similar to video editing a footage of yourself and calling it backward time travel. Actually it is more akin to travelling forward in time faster than the speed of light without breaking causality - like a plane that breaks the speed of sound could go in a loop to hear its own sound boom - but preventing that sound boom from ever happening will not affect your present in that plane, it still did happen.
When I think about traveling into the past I imagine that as soon as I start to go backwards in time, another me would have to be created instantaneously. Either that, or the me from the past time period I was traveling to would cease to exist. The only way for it to be physically possible would be if I were to quickly relive all my past experiences in reverse. And this would have to go on until I reach the past time period I wanted to get to.