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Does the Past Still Exist?


Пікірлер • 13 114

  • Master Therion
    Master Therion 8 ай бұрын +6425

    I've been patiently waiting for Sabine to make a video on this topic. It's about time.

    • Lazy Eye Politics
      Lazy Eye Politics 14 күн бұрын +1

      Was that a pun? 😆 🤣

    • EN R
      EN R 14 күн бұрын

      she will. this is from the future

    • Saint Gabbana
      Saint Gabbana 15 күн бұрын

      A fellow Thelemite? Love is all, love is you ❤

    • Chip.Chippa
      Chip.Chippa 15 күн бұрын

      Its all in the past now.

  • FailBucketFilms
    FailBucketFilms 17 күн бұрын +212

    This starts to make sense when you think about how we percieve stars. If we observe one star that goes supernova 5 million light years away, and then another star that goes super nova 6 million light years away, each of those events happened a million years apart, and we just happen to be at the oberservable point to witness each at the same time.

    • Daarom
      Daarom 2 күн бұрын

      ​@OmgLolWtfxD x I don't think you understand the OP. Say we observe these events at the same time on earth. We know the place/distance of these stars based on previous research, which indicates one is a million light years further from us. If these events then appear simultaneously to us we know that there is a 1 million year "time gap" between the events. Just like when I see thunder I can deduct how long ago it took place by measuring the time until the sound.
      @OP 1 million is almost correct, but we also have to account for the expansion of space itself.

    • OMG OMG
      OMG OMG 9 күн бұрын

      20 mins ....I wish , maybe 5 ... 🤭🤫🫣🥰

    • OmgLolWtfxD x
      OmgLolWtfxD x 10 күн бұрын +1

      “Each of those events happened a million years apart”
      Except a light year is a unit of distance and not time, so, it didn’t.

    • Prince Eli
      Prince Eli 11 күн бұрын

      @Jackie Puppet That's a little sad.

  • helen sotiriadis
    helen sotiriadis 13 күн бұрын +82

    It's so clear when you explain it. I think I'll be coming back to this video often.
    The idea that (at least) the past always exists is the only way I've been able to cope with the loss of my loved ones.

    • atta1798
      atta1798 16 сағат бұрын

      @The Great NERF this is the 3ed explain that was present back then now in the future just became past from the immediate present... Makes sense?

    • atta1798
      atta1798 2 күн бұрын

      @The Great NERF explain what exactly? ...😊

    • The Great NERF
      The Great NERF 2 күн бұрын

      @atta1798 explain

    • atta1798
      atta1798 2 күн бұрын +1

      @The Great NERF nope a tune machine is best

    • The Great NERF
      The Great NERF 3 күн бұрын

      Ai maybe the closest thing we will have to experience the passed. That is if it can reconstruct the everything in the way we can remember the passed. Maybe video maybe vr. Get as much data now that you may want to preserve, for ai to reconstruct at a later date.

  • mrdavid
    mrdavid 19 күн бұрын +104

    A lot of stars we see in the sky were already burnt out a long time ago. It took that long for their light to reach us. We can still physically see something that happened in the past. We can also hear an echo which is not in real time. I think the past still exists (in some way) through some sort of time and distance travel.

    • Philip Mason
      Philip Mason 4 күн бұрын

      @Gunter Raffel The echoes or the energy of past moments might exist .

    • Philip Mason
      Philip Mason 4 күн бұрын

      @Exauce Mayunga Not physically, but perhaps a fraction of the friends soul exists in the photograph ?

    • ardina ariani
      ardina ariani 4 күн бұрын

      Its just like we watching a movie

    • Wraith
      Wraith 9 күн бұрын

      I also can't help but wonder, if it took that long to reach us and now it has reached us. How long does it take to sieze in our now after we observed it

    • Gunter Raffel
      Gunter Raffel 10 күн бұрын +2

      Correction: We can still physically see something that happened in a present that has gone by. There is and never has existed a past. Everything that happens, all changes that happen anywhere in the universe are always happening in somepresent moment. The fact that you are been given a picture of something that happened a long time ago does not prove that the things we see now still esist. They do not, things have changed, time has passed. Here is an example. Let's say you have an uncle who lives in a country half way around the earth away and he has sent you a letter and a photograph about a weekend outing. Your uncle reports to you about a present (to him) exprerience. Does that now mean that those moments still exist? Of course not. All you have is your uncle's letter and the photo. And you uncle has a memory of those mpments, mental pictures. The so-called "past" has become a memory. That is all. So, again, in human experience, no matter what physics says, the future and the past doe not exist in reality. The present is the only real existence, past and future might be called suppositional realities. The future is what we do not have yet, the present is when we do have it, and the past is when we have had it, what remains are pictures of the present, the shadows of yesterday. The automaticity of time makes it so.

  • ChipsMcClive
    ChipsMcClive 11 күн бұрын +17

    I agree. Time isn’t a factor of state change. It’s just a term that people use to try and comprehend the movement of matter. To do “time travel” you have to assemble matter into a state that you believe represents how it once was. The implication being that if you can do that, why not use the energy on something more valuable than regressing.

    • The Doctor
      The Doctor 6 күн бұрын

      Time is either merely a measure of entropy or an arrangement of particles. Both can be true but both cannot be false.

    • Legion
      Legion 6 күн бұрын

      Time isn't illusion. Time is motion, motion is time. To move from one state to another, which is existence, requires the motion of time. Without it there's nothing, which is timelessness. The perception of time is subjective, and it's this perception which is illusory.

  • Theafterhourshow
    Theafterhourshow Ай бұрын +42

    I truly enjoyed this, the dry humor, the information, and the speech. It’s very unique. I would gladly take a masters class with her as the teacher.

    • Noam Sayan
      Noam Sayan 18 күн бұрын +9

      I agree. Her jokes land so weirdly funny.

  • J Smith
    J Smith 22 күн бұрын +26

    So happy this came up in my feed. I have always been interested in math, physics, and engineering, but am nowhere near smart enough to have had any success studying it. So happy there are smart people who are able and willing to explain it to dummies like me!

    • Victoria massey
      Victoria massey 12 күн бұрын +1


    • Lee Johnston
      Lee Johnston 13 күн бұрын +2

      Don't put yourself down

    • 11dsw
      11dsw 13 күн бұрын +4

      If you’re interested in this, in any way, you’re not a dummy😀

  • Christophe Ferreira
    Christophe Ferreira 4 ай бұрын +580

    This is the first video I see on this channel. This is very refreshing to have explanations without all the usual background music, hyperactive ton of speech, or lots of graphics moving around!
    The calm tone of the video is very good for learning!

    • The Pantygun
      The Pantygun 13 күн бұрын

      No music...

    • Don Louden
      Don Louden 13 күн бұрын

      I hear you all the blah blah blah and they say nothing thanks

    • Vincent Shadetree
      Vincent Shadetree 14 күн бұрын

      If light can exist even after it's time has past then the trick would be how to make mass into light and then reconstruct it to where you want it to travel?

    • I bring the Last words
      I bring the Last words 15 күн бұрын

      Photons deceiving us :)

  • Marigona86
    Marigona86 Ай бұрын +125

    During a near death experience I had at age 19, there was no past or future. Only an eternal now which was an indescribable love, beauty, peace. Words can never describe

    • Marigona86
      Marigona86 2 күн бұрын

      @Legion well said 😊

    • Nicholas Barna
      Nicholas Barna 2 күн бұрын

      Just reporting in…still now

    • Legion
      Legion 6 күн бұрын +3

      We cannot contemplate existence without mysticism, quantum physicists are discovering this to be true. Whether one believes in First Cause or God is irrelevant, the mystical aspect of existence is completeness.

    • Henry Garza
      Henry Garza 9 күн бұрын

      @Mr. Ripley and if it wasn't?

    • SvnsetSomnia
      SvnsetSomnia 11 күн бұрын

      @David Gaunt Joe Rogan has entered the chat

  • Sergi Fernández Miranda
    Sergi Fernández Miranda Ай бұрын +65

    I have watched many videos about physics trying to understand all this. Without doubt, this one is the best explanation in simple terms that I have come across

    • Tricisport
      Tricisport 4 күн бұрын

      Better look forward.

    • Glyn Daley
      Glyn Daley 15 күн бұрын

      Watch DR WHO lol 😆

  • Adriana Matlack
    Adriana Matlack 24 күн бұрын +9

    OMG this is a truly incredible video, best one I have seen on the subject. This really is an incredibly good lecture. I have been studying this subject for many years, back then most of what I worked with was in Physical Review D and books. Some great books out there got me interested in physics and math, but I am very impressed by this video and the deep subjects you talk about. I was a math physics major, though the truth is that most of these fascinating concepts can be understood through thought alone.
    The math is certainly interesting. I had to see how it worked. The Tipler cylinder was my first interest, in the math model it is infinite in length so it does not collapse into a black hole. Anyway we know that time like coordinate becomes spacelike and spacelike becomes timelike, but I had to see the math.
    I used to talk to Tipler, and Gott on the phone way back, then later I got into Caltech though I did not go. In any case I study this stuff for fun, and this video is magnificent. BRAVO.

  • Indrani Ghosh Roy
    Indrani Ghosh Roy 13 күн бұрын +6

    She presents so perfectly that I was deliberating if this is a real human or just AI. Uncanny but interesting.

    • Ansh Swaroop
      Ansh Swaroop 3 күн бұрын

      ​@ChipsMcClive It did exist

    • ChipsMcClive
      ChipsMcClive 11 күн бұрын

      AI doesn’t exist yet.

  • Voyager7
    Voyager7 21 күн бұрын +2

    Fascinating! I think the reference to Descartes is extremely apropos as the question or rather the enigma of time, is as much a philosophical question as it is conventionally scientific!

  • James Walsh
    James Walsh Ай бұрын +9

    Great video Sabine. Thanks for the added perspectives on things.

  • Adrian Beckmann
    Adrian Beckmann Ай бұрын +2

    Thank you, this helped me understand this question of the existence of the past so much better.

  • Paul Alan Swisher     kc5hhd (sierra oscar sierra)

    we currently have a problem with the existence/disappearance of events in the past that many people are experiencing on a personal level (very devastating)

  • john hogendoorn
    john hogendoorn Ай бұрын +3

    Spot on Sabine. A joy to follow your thought exploration 🙌🙏

  • ncln
    ncln 6 күн бұрын

    I have a question: so if it were possible - to see something that happened 30 years ago, for example, would you just have to teleport somewhere 30 lightyears away (and view it through a telescope, i suppose)? Of course to do that would be to time travel, because even if you moved at the speed of light it would take you 30 years. so you would have to move faster than the speed of light to arrive somewhere where you could view an event 30 years in the past relative to your personal "now".

  • Dan McAlester
    Dan McAlester 3 ай бұрын +222

    I remember years ago I was talking to my uncle and he told me "the past only truly exists if you live in it". I was told this as a young teen and it stuck with me to this day.

    • Maiden
      Maiden 6 күн бұрын

      ​​@jose juan andrade which is exactly how it's the past, which is also how the present is the future to that. Past, present, and future all coexist at the EXACT same time.

    • Justin Gronseth
      Justin Gronseth 11 күн бұрын

      ​@Alexandra Nevermind That hit hard....thank you.

    • gamer480
      gamer480 17 күн бұрын

      ​@Mr. Robert Aliens exist...

    • Barf O
      Barf O 24 күн бұрын

      @jose juan andrade Did your past turn into the present or will your present turn into your past ?:)

    • A B
      A B 28 күн бұрын

      Dwelling in the past pointlessly is time wasted, but living in the present without having the lessons of the past to draw from, will result in repeating undesirable past experiences.

  • Alpha
    Alpha 12 күн бұрын +2

    Saw this video come up on my feed and was immediately like “oh no don’t do this to me this late at night Sebine”. Great content as always.

  • Nazyair sengikar
    Nazyair sengikar 18 күн бұрын +2

    The view I have of all this is that all things are here now until they decay into what they are made of. For example, for us to go back in time, it would actually be an impossible task because we would need to destroy everything and recreate it all as it was. Meaning it's just a recreation.

  • Kevin Babb
    Kevin Babb 17 күн бұрын +1

    I actually understood that.
    And wouldn’t they have know you were going to say that so they would have already been looking at your right side.
    But they would also had to have seen that already so they were probably looking at your left side to compare.
    Unless they’re a fourth dimensional creature and are looking at you from the inside.

  • Christopher DiVirgilio
    Christopher DiVirgilio 8 күн бұрын

    Miss Sabine's explanation of "now" is brilliantly portrayed in the Mel Brooks film, "Spaceballs" where Col. Sanders explains "now" to Dark Helmet.

  • GeoBot Gaming
    GeoBot Gaming 21 күн бұрын +2

    Just found your channel, such a fresh breath of air, love it! Thanks!

  • Wayne Ingram
    Wayne Ingram 8 ай бұрын +398

    I do love the dry humor woven into the ‘story telling’ and then referred to again randomly…a stand up comic schtick that amazingly turns a physics lecture into a conversation between friends. Brilliant.

    • Maiden
      Maiden 6 күн бұрын

      ​@Sarah Tensile It is scripted, you can see her reading off what she wrote. She probably just liked the joke and wanted to make sure it made it into the video. Nothin wrong with that

    • shittybeansauce
      shittybeansauce 16 күн бұрын

      Brilliant, just like the site. I see what you did there

    • Rockhound
      Rockhound 16 күн бұрын

      @gamer480 I agree about god, but time is relevent.

    • gamer480
      gamer480 17 күн бұрын

      ​@Rockhound Time is an illusion, as past and future doesn't exist.
      Theres no god my friend.

    • Rockhound
      Rockhound 5 ай бұрын

      @mokeish The fact that time exists, no matter where you go in the cosmos, you can't outrun time. You can't not exist without it, or you won't exist to know that? Its all important, and may be the actual being, we call GOD. It witnesses everything at once. Isn't that God? Its every where at once.

  • Rob Hill
    Rob Hill Ай бұрын +2

    The problem exists because people can't conceive of anything outside our understanding of space-time. I would offer an analogy of a recording trying to comprehend the vantage point of the person playing the recording. Think of the differences in the experience. I believe that is what we're dealing with. Starts and stops would be imperceptible to the recording, but not to the player. History and future would have entirely different meanings, which brings in questions of "fate" and "free will" of course, but that's an even more speculative area of discussion about ultimacy, and that's beyond the scope of this video. From the vantage point of the recording, the deeper one probes the more obvious the barriers become. We're locked in, a challenge that I'm sure Houdini would relish, spiritualism notwithstanding. But who knows, maybe there is some way to traverse the reality barrier, to truly create the future if only to somehow make probability and possibility on a one to one ratio. Maybe we already do that or it's being done for us, but we just don't see it. Interesting.

  • mr noodler
    mr noodler 11 күн бұрын

    Beautiful Video! Very sharp thinking, and very well explained in a gentle and pleasant way

  • Mike Brinkman
    Mike Brinkman 9 күн бұрын +1

    Something I’ve been thinking about a lot lately, is it possible that the future has already been lived by someone? 👀

  • roving warrior
    roving warrior Ай бұрын +1

    Theoretically everything we see and hear is the past since it takes time for the light and sound to travel to us. The more the distance is increased from what we're hearing and observing the further into the past we're perceiving.

  • Frances Venezia
    Frances Venezia Ай бұрын +4

    "The reason we have time is so that everything doesn't happen all at once."
    Albert Einstein

    • The Doctor
      The Doctor 6 күн бұрын

      Time is an illusion, albeit a stubbornly persistent one- One Stone

  • Anthony W
    Anthony W 4 ай бұрын +201

    Just discovered Sabine. I love her dead pan humor and style. Being a student of Non Duality (Advaita Vedanta) I find her examples so strikingly similar to the consciousness only model that it helped me understand the notion of consciousness contracting itself via the observer to experience 3rd dimensional reality and how all there is is now and our experience of this now. Thanks

    • Jameson Mc
      Jameson Mc 12 күн бұрын

      I stopped listening at 4.57

    • Elkster Eidolon
      Elkster Eidolon  15 күн бұрын

      How does it help you understand that you cannot see 3D dimensions from a 2D view?

    • Anthony W
      Anthony W 2 ай бұрын

      @ctwalk69 Not sure if the Q was directed to my original post? Is the Q about Non duality/ the consciousness only model, or another part of my ramblings?

  • Charles
    Charles Ай бұрын +7

    Very good presentation. I like you used the words "thought experiment", and "assumption". We get into trouble with those assumptions being assumed true as a principle. One point she made about it being looked at like space but its not like space. I can go backwards in space. In the end. Time is still a mystery?

    • Deltafoxhotel7
      Deltafoxhotel7 15 күн бұрын

      @Person Oisels I thought Einstein said time and space were the same fabric…

    • Person Oisels
      Person Oisels 23 күн бұрын

      Can you go backwards in space though?

  • Raul Carbajal
    Raul Carbajal Ай бұрын +2

    This was amazing! Thank you for teaching my 40 y/o self something new!

  • Will Vella
    Will Vella 21 күн бұрын +2

    The deadpan narrative, the dry as the Sahara Desert , humor...I love you Sabine.

  • Blingy McDaddy
    Blingy McDaddy 9 күн бұрын

    I’ve seen my life as a timeline, able to see each version of myself at each moment of time, analyzing how each version of myself felt about the version of myself in a different time. It makes sense, though, because TIME was dissolved and I felt stuck in that moment forever, because since I was experiencing foreverness, there was no idea of time.
    I’ve noticed when I’m in tune with the universe, my purpose and soul, I feel like I’ve been alive for a very very long time, yet like I’ve barely lived at all. It’s that flow state allowing me to tap into my spirit and feel all my past lives experiences

    • RobbeyT
      RobbeyT 16 сағат бұрын

      @John Pritchard Prove it!

    • John Pritchard
      John Pritchard 4 күн бұрын

      there is no soul

  • hraith
    hraith 7 ай бұрын +254

    As a working class layman, thank you for making this topic more accessible to me.

    • Brakonecki
      Brakonecki Ай бұрын

      @Rockhound How could you give the name God to something that is inanimate though. God or god's are typically defined as supernatural beings and are typically able to exist and operate outside of nature's bounderies. There are many definitions to the word god, it's a concept.

    • Slade
      Slade 4 ай бұрын +1

      @JAMES NOAH ANDERSON Jr I'll try the app.

      JAMES NOAH ANDERSON Jr 4 ай бұрын

      @Slade it's all about when your actually see reality and it's true colors, not in a blur like they want you to see them. That's the meaning of the red pill reality and the blue pill blurred reality, most people live in the blurred version of reality, but I don't know where you're at at this point so I can't make that distinction. Most people that come out of it can't handle what they see, I have to admit I didn't like it either. When you get time just work on one of those IQ enhancers, like luminosity. It will make things look clearer

    • Slade
      Slade 4 ай бұрын +1

      @JAMES NOAH ANDERSON Jr I don't understand what you mean

      JAMES NOAH ANDERSON Jr 4 ай бұрын

      @Slade well your in for a hell of a ride, sometimes it takes a couple days to kick in. But when it does it does.

  • Tod Janssen
    Tod Janssen Ай бұрын +1

    Oh, I really like Sabine. She explains things nicely and throws in a little humour, too.

  • Brian & Sylvia
    Brian & Sylvia 14 күн бұрын +1

    Can I just say that I've thought about it, and I think that the past does physically exist and here's why: Say you've got a point R0, the point that will become a singularity in a black hole. R1 is your observer. R2 is your friend, the other observer. At some time, a black hole forms around R0, encompassing R1 and R2. Now, you're R1, you can't go "up" away from R0 to R2. You're constantly stationary against R0 or falling toward R0. But R2 still exists, in your "past" which is the R direction away from R0.

  • My music
    My music 18 күн бұрын

    Wow really well explained - I love your sense of humour :)

  • Nerdygirl
    Nerdygirl Ай бұрын +13

    As a person who suffered personal tragedy and loss of loved ones I would love to embrace the philosophy of the title of Sabine's video: "Does the past still exist?" However, as an engineer and mathematician and scienrist, I have to clearly see reality of the absurdity of my thinking, and realize that it is impossible to go into the past. You can relive past events in your menory, but you can't go into the past and actually be there. Time is a dimension, and we should treat it that way.

    • Nerdygirl
      Nerdygirl 5 күн бұрын

      @The Doctor This reminds me of that U-shaped 3D image where a plane is bent into a U, and the 2 planes are connected with a "vortex". If a 2-dimensional shape can be bent in 3 dimensions, why not "connect" 2 parts of 3D space in the 4th dimension?

    • The Doctor
      The Doctor 6 күн бұрын

      Technically, merely exceeding light speed automatically takes you back in time...

    • R
      R 12 күн бұрын +1

      If it’s any consolation-from a psychological and neuroscience perspective, we can go into the past! In fact we literally slightly alter memories each time we revisit them, so the past never “stays put” in the way we think, and with professional support, we can even revisit in all kinds of surprising and interactive ways. ❤

  • Matt Prince
    Matt Prince 21 күн бұрын +1

    I've always said that time is always happening. Even when I was a small child (2/3yrs old) I would say the same and baffle my parents. I had it in me from as far back as I can remember. I truly believe that time is no different than writing data to a massive hard drive. It's always there and those that have the gift of being able to access that are the "ghosts" and "time travellers" that are awash in history.

  • Myriaddsystems
    Myriaddsystems 5 ай бұрын +250

    I like the down to earth explanations. The greatest indicator of intelligence is shown by someone who can explain advanced ideas in such a way that anyone else can understand. Superb!

    • Benjamin Roe
      Benjamin Roe Ай бұрын

      @Rockhound It could happen both ways simultaneously actually in fact according to this video the creation or evolution is NOW or it's 15 billion years ago. Depends on the observer and their point of view.

    • Benjamin Roe
      Benjamin Roe Ай бұрын

      @Sooz It's just a platitude. It's not REALLY true. Being able to teach ANY coplex topic to ANY person would be MORE than intelligent. It would be an ACT of GOD. Haha.

    • Trey Stephens
      Trey Stephens 3 ай бұрын

      I’m still too dumb.

  • Old Dog
    Old Dog Ай бұрын +1

    Seeing as everything in the universe is always in motion relative to everything else, any coordinates in time/space are momentary at best. They are not permanently set. The amount of time doesn't matter because the time displacement is already done and the rest of space has already changed relative to it. As best I can figure, the past as defined by those coordinates no longer exists.

  • Dementional
    Dementional Ай бұрын

    A "relatively" easy lecture to follow. I will admit the humor is reminding me I am still intact in the moment.

  • Damus Deshi
    Damus Deshi 14 күн бұрын +1

    Thanks for this video. I believe they (the past) do, exist. We just haven't found out how to retrieve the "path of reality" of any timeline, yet. The key source. I happened to, idk if this just coincident or whatever, multiple times seeing future from my dreams. Kinda wish someday, anyone, or any scientist to understand how my brain works. I always, like, think way ahead of anybody around me, maybe some of you think, I am a paranoid guy, but I'm not just think bad things, I prefer said I'm thinking multiple possibilities in any situations. From best to worst.

  • Busty McNutters
    Busty McNutters 15 күн бұрын +12

    All events exist now. 🤯 That is just crazy. Anything that's ever happened can be happening right now as long as you're in the right place at the right time.

    • The Doctor
      The Doctor 6 күн бұрын +1

      Both statements are partially wrong. Watch some Carlo Rovelli.

    • bruzote
      bruzote 7 күн бұрын

      Except you are wrong, because ALL events are relative to the observation. If something is in the past, it can't be now BY DEFINITION. The past can't be now or it would be the present. It is that simple.

  • Gustavo Cunha
    Gustavo Cunha 21 күн бұрын

    You are a fricking genius. Loved everything about this. Jokes, content, delivery. Amazing.

  • Barb Krienke
    Barb Krienke 8 ай бұрын +100

    I love how you pepper this serious discussion with humor bombs! Thanks for making such complex ideas more understandable!

    • sp4nky66
      sp4nky66 8 ай бұрын

      The operative term being "bombs"... 🙄

    • The Average Painter
      The Average Painter 8 ай бұрын +1

      @YourLogicalNightmare Yes, he had a German name, this is how it is pronounced.

    • Dr. Christopher Johnson
      Dr. Christopher Johnson 8 ай бұрын

      👋 i hope you’re safe over there? I hope this year brings happiness prosperity love and peace ❤ 🕊🕊 all over the world 🙏🌍
      I'm Doctor Christopher Johnson originally from California 🌟🌟🌟🌟 and you where are you from if I may asked?💭💭

    • Dana Black
      Dana Black 8 ай бұрын +2

      Idk why I read “boobs” instead of “bombs” 🤦🏽‍♂️😅

    • Sekov Ittol
      Sekov Ittol 8 ай бұрын +1

      @MTL Yes, I noticed that.
      She'd be great to go take a 'trip' with.
      She'd blow my mind.

  • mike03a3
    mike03a3 Ай бұрын +1

    My darling daughter asked me yesterday "How many stars that we can see don't exist?" She realized that some could have exploded into super novas long ago, but the news just hasn't reached us yet.
    (It's not always easy being her father.)

  • Ted Shapiro
    Ted Shapiro Ай бұрын

    With all due respect, if Alice is moving left to right then she is moving toward the mirror on the right so the light should reach this mirror first, not the other way round.Also, the way the diagram is drawn has the photon's departing at different angles, when it seems to me, if one is in search of accuracy, they should both depart at the same angle.

  • Aaron Walderslade
    Aaron Walderslade 16 күн бұрын +1

    Time is really a fuel for space to use to change. Any spacial element that "burns" more time ends up ahead in the race, if you will. And that's pretty much it

  • Supersupra87
    Supersupra87 Ай бұрын +6

    I know by experience that some people know what is going to happen in the future and describes it pretty specific, this person was not a friend or relative. I learnt about this before and after it happened. So this made me think that maybe the future is already written or experienced somehow. I won´t get into to details, but for me personally it was an eye opener.

  • Robb.M.A
    Robb.M.A 14 күн бұрын

    Not only do you learn something, you actually get to enjoy some top tier comedy

  • Juliet Wochholz
    Juliet Wochholz 8 ай бұрын +20

    Can’t wait to read your book. Working on non-duality and studying physics. Direct experience validates it is always now. Block universe fits nicely. Also eye opening: there is always some observer for whom the 2 events happen simultaneously. Yes! Thanks, and keep making videos.

    • Dr. Christopher Johnson
      Dr. Christopher Johnson 8 ай бұрын

      👋 i hope you’re safe over there? I hope this year brings happiness prosperity love and peace ❤ 🕊🕊 all over the world 🙏🌍
      I'm Doctor Christopher Johnson originally from California 🌟🌟🌟🌟 and you where are you from if I may asked?💭💭

    • Hyperduality
      Hyperduality 8 ай бұрын +1

      Gravitation is equivalent or dual (isomorphic) to acceleration -- Einstein's happiest thought, the principle of equivalence (duality).
      Antinomy (duality) is two truths that contradict each other -- Immanuel Kant.
      Space is dual to time -- Einstein.
      The future is dual to the past -- time duality.
      We predict (syntropy) the future and remember the past.
      Time dilation is dual to length contraction -- Einstein, special relativity.
      Energy is dual to mass -- Einstein.
      Dark energy is dual to dark matter.
      From a converging, convex or syntropic perspective everything looks divergent, concave or entropic -- the 2nd law of thermodynamics.
      All observers have a syntropic perspective according to the 2nd law of thermodynamics!
      My syntropy is your entropy and your syntropy is my entropy -- duality.
      Syntropy (prediction) is dual to increasing entropy -- the 4th law of thermodynamics.
      Teleological physics (syntropy) is dual to non-teleological physics (entropy).
      Homology is dual to co-homology -- topology.
      Decreasing the number of dimensions or states is a syntropic process -- homology.
      Increasing the number of dimensions or states is an entropic process -- co-homology.
      The 4th law of thermodynamics is hardwired into mathematics.
      Convergence (homology, syntropy) is dual to divergence (co-homology, entropy).
      "Always two there are" -- Yoda.
      Duality creates reality.

    • Daniel Trędewicz
      Daniel Trędewicz 8 ай бұрын

      "there is always some observer for whom the 2 events happen simultaneously" - well, that depends. If one takes a space-time diagram and places 2 events such that for them to happen simultanously the observer must travel faster than light, then it's true ONLY IF such observer may exist.

  • Lelouch Z
    Lelouch Z Ай бұрын +1

    Many people still want to live in the past. Though it's not necessarily always a bad idea.

  • SP I
    SP I Ай бұрын

    Just wanted to say I had a lot of fun watching this video, thank you :)

  • CPD
    CPD 9 күн бұрын

    Normalisation of infinities' ignore them' and placement of arbitrary numbers in QED equations gets my alarm bells ringing.
    Very loud.
    Thanks for the upload Sabine.
    Science has become entertainment in the form of fancy Dan computer models built on uncertainties where parsimony and Occams razor are bad words.
    Just had to get that off my chest but I'm OK now.
    Pmsl. 😉😚

  • Phillip Holmes
    Phillip Holmes Ай бұрын

    The speed of light may stay the same, but if you are moving then the speed light is hitting the observer changes, which is what the doppler effect is, so, because the speed of light is relative to the speed of the observer, the perceived rate at which light is perceived chages, and that's the reason the rate at which time seems to happen 'appears' to change.

  • Michael Wittman
    Michael Wittman 11 күн бұрын

    I think the "past" and "future" only exist in our minds. Humans experience the eternal moment of now as the passage of time.

  • Harry
    Harry 8 ай бұрын +38

    Dear Mrs. Hossenfelder,
    Thank you for your work and efforts in the service of educating the public while making the concepts accessible to a large audience.

  • Dat Man
    Dat Man Ай бұрын +1

    In a sense yes. If a alien world was 100 billion miles away from us but had a telescope that they could see earth. Hypothetically they could still be looking at dinosaurs on Earth or even the primordial soup of lava and volcanoes idk

  • BagsOfFun96
    BagsOfFun96 17 күн бұрын +1

    Yes, the past still exists. Without it, literally nothing would exist in the present.

  • Channel1
    Channel1 20 күн бұрын +1

    When I think of time, I think of a record album. I was long bothered by how the first song takes up a small 'visible space' on the vinyl and the closer to the center, the wider the bandwith, but no longer the song. SO, I've framed the hole in the middle, as what we call, the beginning of our perception of time. And the closer to center, the more rotations needed to occupy the same space/length. And I explain deja-vu's as stepping into a parallel, but no less real, experience of time. Quite like when the phonograph needle skips/jumps to another and then self-corrects. It's good to have a place to share such inner ramblings.....

  • Phil Makak
    Phil Makak Ай бұрын +1

    My theory is that when can go back in time by our consciousness of our mind. If our past still exists as we speak then the consciousness that you left there is still used in progress. Therefore we can travel in time if we just concentrate enough that our level of consciousness in the present and in the past will in sync. You see according to Einstein that time is a straight line but also predetermined......🤔♥️♥️♥️

    • noob19087
      noob19087 17 күн бұрын

      Your consciousness requires time to work. Your brain isn't conscious at any specific moment, just like one frame isn't a movie. You might be able to do that, but since your brain would return to its earlier state it would be impossible to be aware of it. And until we can find a way to measure that, we'll have to assume it doesn't happen.

  • Justhings
    Justhings 12 күн бұрын

    When I think about the past. Technically the speed of a human thought is roughly as fast as the speed of light. (Neurons firing sparking a chemical reaction producing the thought) Therefore it is possible to subconsciously travel back In time because the speed of your thought got to the past, in “no time”

  • RB
    RB 2 ай бұрын +31

    Whether it still physically exists, or not, much of my past will haunt me forever. But I try to stay positive. 😎

    • Petey
      Petey 5 күн бұрын

      @RB wow bro. Well I'm wishing you all the best! ✌️

    • RB
      RB 5 күн бұрын

      @Petey - Continuous intoxication allows me to live with LESS discomfort. It is really not unfortunate.

    • Petey
      Petey 5 күн бұрын

      @RB unfortunate!

    • RB
      RB 5 күн бұрын

      @Petey - As continuously as possible.

    • RB
      RB 5 күн бұрын

      @Josh Dean - Sorry to disappoint you, but I'm just a heterosexual.

  • Ja Me
    Ja Me Ай бұрын

    Fascinating teacher. Interesting and informative. Thank you

  • revpgesqredux
    revpgesqredux Ай бұрын +1

    No matter what you call an observer, it has to be a human being to verify the observation

    XANDRE 13 күн бұрын

    “There are no driveways for awkward three point turns” Best. Quote. Ever.

  • Billy Bobber
    Billy Bobber 13 күн бұрын

    The past exists inside ourselves. If what exists reflects and connects to something or the past then it does exist yet only to you.

  • S10 Negan
    S10 Negan 17 күн бұрын

    The past only exist in ones memories. To physically travel back into or to the future is IMPOSSIBLE!

  • J C
    J C 2 ай бұрын +50

    Such a cool coincidence that I found this video today! Just yesterday I was thinking to myself that the past is no more real than fantasy. Specifically I was thinking about my city, the version of it that existed 20 years ago, and how that place may exist in my mind and the minds of others, but so do Oz and Wonderland, and none of these is a place one can go.
    I’m glad to be challenged and informed on this at the same time!

    • ElectricSheep
      ElectricSheep 15 күн бұрын

      It's funny because just an hour before I got on KZclip, I was talking to someone about the past. They were reminiscing, wishing they could go back and experience a certain day again. I said something along the lines of "who knows, things moved but the moment is essentially the same." While that's not very articulate, I was thinking of a concept similar to this topic, and sure enough I open up KZclip to get this recommended. I'm not sure if I'm impressed or fearful, lol.

    • handsome DRAC
      handsome DRAC 16 күн бұрын

      @gamer480 yes

    • studas2011
      studas2011 16 күн бұрын

      @tbone6924 I was curious as to whether it was another cultural casualty of globalism.

    • tbone6924
      tbone6924 16 күн бұрын

      @studas2011 does it matter? This would apply to any city.

    • gamer480
      gamer480 16 күн бұрын

      @handsome DRAC Also aliens exists...

  • Chey
    Chey Ай бұрын +5

    So, same principle could apply to sound. Someone firing a gun would hear it the moment they pulled the trigger (that observer's "now"). Another person several miles away would hear the same gunshot a few seconds later. The gunshot is in the past, but actually, that event only exists then for that observer.

    • bruzote
      bruzote 7 күн бұрын

      @Max Steinhausen - How can you travel at the speed of light in order to catch up with TV and radio signals traveling at the same speed of light? You would never catch those signals. So, you would have to settle on sitting in one place and waiting for broadcasts of reruns to reach you.

    • Hamstertube
      Hamstertube 13 күн бұрын

      Yes, but how about if the sound is blocked somewhere between the source and the person who could hear it? For that person, there was no gun firing. Same if the the light of a star somehow can’t reach us because it’s being blocked. For us, that star simply doesn’t exist.
      So the whole thing about time is the light that travels from the source to you, but if there is no light to see, then you can’t see the past and it just don’t exist anymore.

    • Max Steinhausen
      Max Steinhausen 16 күн бұрын

      Yes and exactly the same is true for light. But, contrary to Sabine’s theory, I can’t see how that would mean that a past event still exists, rather, I think that the emitted sound, light, radio waves travel through space eternally and can be observed by whoever is at the right place at the right time. So I don’t think we can travel time, but we could possibly fly away from earth at the speed of light and then receive the world’s TV and radio program from the 70ies.

  • mocabe gamer
    mocabe gamer Ай бұрын

    today i learned (among many others) that it's pronounced as " Ayn Shtayn " and not "Ayns Tayn"
    thank you for this wonderfully (literally!) educational video!
    thank God I live in this time where excellent education material is accessible.

  • Glywnnis Wells
    Glywnnis Wells 18 күн бұрын +1

    Einstein is credited with everything other people actually discovered.

  • TheWorldsnotenough
    TheWorldsnotenough Ай бұрын

    Only the now exist. The only thing we have to really verify that anything happened in the “past” is material left behind and the memories that we have. Otherwise the past with each passing second is literally gone and no longer exists

  • Herman Finster
    Herman Finster 12 күн бұрын

    I don’t know what gobbledygook is, but it sounds really cool. Where can I find the physics videos with it?

  • Rich
    Rich 15 күн бұрын

    Now always exists for the person ,if you could travel back and forward in time your experiences of time will always move forward due to added experiences compounding(memories) even if you coyld reverse aging

  • Paul Edwards
    Paul Edwards 2 ай бұрын +106

    What blew my mind is that when Sabine gave examples of 'now', she knew I was watching the video. Amazing, great video.

    • Dylan Morrow
      Dylan Morrow 21 күн бұрын +5

      This gonna blow your mind.. but when you read this you will be watching again 😱

    • struggle boy
      struggle boy Ай бұрын +1


    • Furious Furian
      Furious Furian Ай бұрын +2

      It's uncanny

    • Deciduous Rex
      Deciduous Rex Ай бұрын +2

      You hadn't disappeared yet.....

  • Xcrack
    Xcrack Ай бұрын

    Time is a concept in our heads. The past only exists because we have the ability to remember events of times past. There comes to a point in generations of people where eventually the past is forgotten and therefore doesn’t exist. The way I see things, life and oblivion happen every second of the day. Someone is born, and someone dies. For me, “time” didn’t exist until I was born and more importantly, developed the concept of time and time will end the day I die.

  • MsArgentana
    MsArgentana Ай бұрын

    I always had the perception that everything future and past are present... Or an allbinclusive present😇

  • Z
    Z 12 күн бұрын

    I think we can possibly view the past through reverberation of particles, but not physically go there.

  • Gary Francis
    Gary Francis Ай бұрын +1

    I have always wondered why Sabine went into physics and not stand up comedy.

    • Daf
      Daf Ай бұрын

      I love her sense of humor!

  • Ronald_R_Lyon
    Ronald_R_Lyon 15 күн бұрын

    I think time is a result of movement and everything moves forward, when something moves Up down left right or backward it still moving forward just in a new direction. If you walk to the shop facing backwards you still moved forward to get there, Only being able to move forward in space is why we only move forward in time

  • Anik Samiur Rahman
    Anik Samiur Rahman 8 ай бұрын +20

    Dr. Sabine, you're a natural science communicator. No other source imbues me with such deep insights as your videos.

    • ResidentFelon
      ResidentFelon 8 ай бұрын

      She is a straight up deceiver ;-)

  • mirrorspeak
    mirrorspeak Ай бұрын +6

    If it’s a block universe and the past exists, where am I in the timeline? The leading edge? Somewhere in the middle? It makes me feel sad that there’s another me going through what I went through and that I can’t change it for the better.

    • snoozieboi
      snoozieboi 7 күн бұрын +1

      @C B The mini series "Devs" is also kind of cool. Some people complain they're annoyed by the main character and find the progress slow, I loved the concept and ended up reading around the subject of time.

    • bruzote
      bruzote 7 күн бұрын

      @Schakiar Ligonde - "Non-deterministic" is not the same as "free will".

    • Schakiar Ligonde
      Schakiar Ligonde 12 күн бұрын

      Well quantum mechanics may be in deterministic and if so you would have a chance

    • mirrorspeak
      mirrorspeak 15 күн бұрын +1

      @seph13x that’s assuming you would have a choice…

  • WiIdbiII
    WiIdbiII Ай бұрын

    Thanks. That really cleared some things up for me.

  • EquestriaGuy
    EquestriaGuy 21 күн бұрын

    "Does the past still exist" is like half the premise of Orwell's 1984 lol, so this topic is a good question with many answers

  • Graham
    Graham Ай бұрын

    I don't know why but topics such as this and how the universe began always give me an anxious feeling! Like my brain just can't process the info...😟

  • mihaisor
    mihaisor 18 күн бұрын

    I prefer to think of spacetime as a 4D surface, where "NOW" is the moment an observer encounters an event. The diagrams might help to explain the theory, but too often, people can't stop themselves from pointing out that look, if you change that 45 degree angle just right, in other words, go faster than C, it will allow you to travel back in time. Which is complete nonsense, but it keeps creeping up in armchair physics.

  • Alfred Sutton
    Alfred Sutton 8 ай бұрын +28

    Thank you Dr Hossenfelder … you’ve done a great job of continuing my education.

  • Robert D
    Robert D Ай бұрын

    People who have near death experiences, including some in these comments, often say that their life really did flash before their eyes, that they saw each moment of it but all at once. Maybe this explains that?

  • bailee alligood
    bailee alligood 14 күн бұрын

    The past exists as long as we remember it. What we remembered may change over time.
    Time is but a measurement of observation.

  • Tew10 410
    Tew10 410 20 күн бұрын

    Wow, from the correct view point in space. I'm still walking around as a kid. My Dad's alive, my brother's aren't locked up. My aunts didn't pass yet.
    Shid go out further you could catch a James Brown performance lol. See how they actually built the pyramids. Just gave me a different kind of peace. The future is really the only thing we can change or control. A lot in thinking about right now. Usually only a Neil Degrasse Tyson book makes ne feel this way, or like a comedian. THANKS SO MUCH SABINE. lobe you for this

  • Glen S
    Glen S 12 күн бұрын +2

    To think time still exists in the past means all our loved ones who have since passed are still alive in the past living their lifes over and over.

  • Xxx Yyy
    Xxx Yyy 5 күн бұрын

    5 天前
    I agree. Time isn’t a factor of state change. It’s just a term that people use to try and comprehend the movement of matter. To do “time travel” you have to assemble matter into a state that you believe represents how it once was. The implication being that if you can do that, why not use the energy on something more valuable than regressing. ENTROPY🤔

  • Maestro Lieflander
    Maestro Lieflander 6 ай бұрын +123

    Bravo! I have never heard such a good explanation of the Block Universe! Now this saying makes perfect sense: Time is a thin line of perception through an infinite universe of happenings.

    • Lisa Moag
      Lisa Moag 3 ай бұрын


    • Londen
      Londen 4 ай бұрын

      @𝘵𝘩𝘦 𝘱𝘰𝘵𝘢𝘵𝘰 𝘴𝘢𝘭𝘢𝘥 𝘨𝘶𝘺 I see our spiritual force field is on maximum today. People have been deifying objects in the sky for a long time. Some of us might need to revisit our roots.

  • Dale Monk
    Dale Monk 16 күн бұрын +1

    I spent the first half of this video trying to work out if Sabine was an AI created character with a voice over

  • Raul Rojas
    Raul Rojas Ай бұрын +1

    I belive the subject is amazing. Sadly, I was not able to understand, because to me, now is not about when a beam of light arrives, or when a watch moves its neddle, but a tick that happens at once in the entire universe and in forward direction only, no matter the technical issues that afect an observer's perception delay. I know however that I am wrong because of my ignorance. But wanted to express where I"m stuck.

  • Road Hippie!
    Road Hippie! 14 күн бұрын +1

    Of course the past exist, it’s already existed, what has existed, does exist. The future exist as well, we just haven’t experienced it yet, but it’s inevitable.