What Is Time? | Professor Sean Carroll Explains Presentism and Eternalism
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- Опубліковано 4 тра 2024
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It's said that the clock is always ticking, but there's a chance that it isn't. The theory of "presentism" states that the current moment is the only thing that's real, while "eternalism" is the belief that all existence in time is equally real. Find out if the future is really out there and predictable-just don't tell us who wins the big game next year.
This video is episode two from the series "Mysteries of Modern Physics: Time", Presented by Sean Carroll
Learn more about the physics of time at www.wondrium.com/UA-cam
00:00 Science and Philosophy Combine When Studying Time
2:30 Experiments Prove Continuity of Time
6:47 Time Is Somewhat Predictable
8:10 Why We Think of Time Differently
8:49 Our Perception of Time Leads to Spacetime
11:54 We Dissect Presentism vs Eternalism
15:43 Memories and Items From the Past Make it More Real
17:47 Galileo Discovers Pendulum Speeds Are Identical
25:00 Thought Experiment: “What if Time Stopped?”
29:07 Time Connects Us With the Outside World
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#whatistime #seancarroll #physics
Love this format. No audience. No overuse of special effects. No host trying to be overly entertaining and funny like some of today's documentaries.
total agreement here, no clowns, knowledge counts instead :)
There is an episode of Startalk with Neil Degrasse Tyson of which 4 times him and his host were joking about a certain topic and the poor professor who was being interviewed just stood there like a statue trying to avoid the “joke”. Lol!
Well said. It's like yo yo yo whattup science bitches? Lemme give a shout out to my physics posse.
@Science Revolution what the hell are you talking about?
Love this comment. Helpful. Constructive. Non-repetitive. Straight to the point, allows the creator to know we wanna see it
Yesterday is but a dream; tomorrow is but a vision,
But today, well lived,
Makes every yesterday a dream of happiness,
And every tomorrow a vision of hope.
That's the turtle from Kung Fu Panda right?
great thinking ....🙏🙏🙏
Prof. Carroll has a genius for clear teaching. I can’t think of anyone else who explains complexity so smoothly and effectively.
After watching the lecture, I began to read comments and was so surprised that the large majority of commentators had a great understanding of the subject discussed and made more easy for me to get my concepts more clearer than ever.....keep on spreading the light of knowledge with a logical approach....my heartfelt thanks to the entire team who made this happened...
Thanks, like a great song"lotsa info packed into brief time-space; me thinks you may be an acolyte of henry jacobowitz and john bonham😄
Verify every bit of information you conceive
TIME IS THE CAUSE OF GRAVITY ??
Jean Pier Garnier Malet joya 💎 found it! l am sure you enjoy it ! greetings from Santiago Chile 🇨🇱
@@kn9ioutom i hold to Presentism.
I do not believe in time existing as a separate thing from matter, and would say we base time on sequences of change or movements relative to change in another object.
Like we base a day on the movement of the sun around the earth. Then we divide that up into 24 parts. Then divide that into smaller parts. Then we set hour glasses to measure it. Then watches that count in a similar manner.
But what is that watch originally based on? The movement of the sun and we coordinate that to the movement of the hands or numbers on a watch.
But what you do not see is people just setting the watch to a thing called time. Time is not some reference point in of itself.
Just like if you asked how tall I am, and I said " 6". "6 what?" " Well I am 6 tall."
Time is nothing that can be traveled. You cannot travel to the past. We live in the now. And basically there is matter and the movement and arrangement of it in its current state to the next. And we base time on that
Carroll is awesome. He is able to distill scientific concepts to a level understandable by a common person. I saw him on Joe Rogan. The way he was able to explain heavy concepts...unbelievable.
Absolutely, right from the beginning. The subject or body of knowledge is NOT absolute, the way we understand totally changes the knowledge. Is that another accepted subject of study in philosophy?
and Rogan says DeGrasse is a much better explainer
Except for that one time where he used the stupid term "proper time", and confused the kid in the video explaining relativity to a child, a teen, a student and a professor.
@@TheShootist Yes, Neil is cool, too. But he needs to be careful. The #metoo stuff is for real. Word on the street is that he's putting moves on women in his circle. Wrong. Don't try to get p***y from your employees. That's immoral and unethical.
@@room111photography5 better to act a man than a mouse.
i admire Sean's ability to speak so simple and clear about most fundamental and complex things.
What an incredible documentary! I enjoyed it so much I’m going to watch it again yesterday.
What a great comment I will also read it again yesterday
I just read this comment tomorrow.
JR,,,,,,,,,,YOU DON'T HAVE A CLUE ABOUT WHAT YOU'VE SEEN HERE !
😭🤣😭🤣😭
There are 4 part series by Brian Greene - watch that first. Have to understand space first in order to understand time. ua-cam.com/video/dEWupAFtXGU/v-deo.html
Fantastic lecture. His explanations are especially effective for those of us without any visual component to our memories/thoughts, who sometimes struggle the moment someone says "just picture/imagine/visualize such and such"
Don't even get me started on "picture X and then rotate it in y manner"
Gosh. Sean Carroll you are such a smart man. You say things in what seem like to be the best possible ways to explain them. Such a great communicator. Intelligence is less valuable without good communication. Good communication is less valuable without good intelligence. You sir are what happens what you have both. TY for your hard work.
But sean must not stop growing in his philosophy because what one sees is what one sees.
Brian Freeman I don’t think u learned anything
Truly one of the best science communicator out there.
Be Honest #Now !!!
@@aussieragdoll_tnls932 746 for me because of 17:11 error. And that's just one thing.
Communicators
@@ophiolatreia93 (^.^)
This guy went one place above Brian Cox in my top 5
And it’s enlightening to see how Sean has actually had a long time to develop, articulate, and get familiar with these ideas and his style of communicating. Interesting and maybe obvious to realize that ‘Biggest Ideas in the Universe’ didn’t completely fall out of thin air
I recall a childhood riddle: What's always approaching but never arrives? Tomorrow.
At the beginning of the COVID pandemic I had this eerie feeling that time had slowed down, yet I felt like I was aging more rapidly. I'm not sure how to reconcile those perceived contradictions.
String theory may be true, but maybe knot.
William Scott not*
String Theory is work in progress. Also, General Relativity it's NOT a complete theory, because it does not explain new factors no seem 100+ years ago.
do you have a particle collider the size of M31? No? No SUSY for you.
😂😂😂
William Scott funny
Yeah I have to turn in a project in two hours; lets watch this video and hopefully gain some insight into my procrastination.
How'd you do bro? -truly interested😊
My motto is "procrastinate now",
Hope that project went well g 😂
What is time? Time is something that can be used to describe changes. If everything is static then there is no need of time. So time is a state variable. It is man-made, mathematical, non-physical variable, to describe the state changes of the universe. It is independent from space. The existence of universe doesn’t need time, it is our human being that needs time to describe the changes of our universe.
BINGO
Only if TIME were man made, unless you're describing a concept of time that living beings have experienced and expressed over a period of Time 🕎🕛🤴🔱⚓🌊🐬🚀🌌
Professor, you are a blessing to students like me, who are constantly learning!
One of the great things about most of The Great Courses (TGC) lectures that I have seen so far, like this one, is that professors, like Dr. Sean Caroll here, bind all the concepts involved together in great talks, you get to see the whole picture, the tree and the forest. When I was in college, we did the calculations, I took tests, exams, finals, but never really had the chance to see things like this, in a holistic way. And TGC do all this in all its courses consistently. I would say that all universities should have this for people to be able to follow up, and to be more connected! Not to mention that we can always revisit these lectures over and over again, for example in search of inspiration, to research any particular topic. They help us to go from the tree to the forest back and forth all the time consistently!
“Time is the moving image of eternity.”
--Plato
this man knows nothing of time time was invented bye man to make sense of what we do and understand if u go to work at 6.am an finish at 3pm the is how long we are at work the sun rises in the east and sets in the west how long does it take to move from east to west we use a clock mostly are 24 hrs long befor we ad clock we started at sunrise and finished at say midday thats the sun move south at say 12 hrs no such thing as space and time dont exist in nature lol he gets payed for this rubbish
@@roybradshaw4252 time does exist everywhere tho lol. How are you going to say it doesn't exist naturally? Why do animals get older then? Why do things change? This is time in motion. The way we label time however is not natural and really only pertains to humans. We put this label on however so that we are able to better understand the process of time and what it is, so when people are explaining time they are talking about the mechanics of time not the way we describe it, but the way it describes itself.
@@TheForneveralone it is a process that all living things go through its not time its a process witch applies to all things according to how old they are and time was invented bye humans to understand of periods of movement of natural things in the universeif u over work u get tired and hill so you take periods of to rest
@@roybradshaw4252Then what about past present and future bro
past as gone presant is right now and the future as yet to come so time as nothing to do with it u cant say it 7pm if its really 6pm a time that humans have agreed with not found in nature@@shangavik4128
"What is the meaning of Time?"
Life is time and time is life. We need it more than food or water but waste it just as readily. We buy it from others to save our own through employment or servitude. Just now, You gave me some of your precious time to read this just as I used my time to write this.
Thank you for the video. Here in New York City 7:38 a.m. Wednesday October 6th watching again, and I love the background cool pictures. So many philosophical answers about "what is time."
What do we want?
Time travel!
When do we want it?
Irrelevant!
Time travel isn't possible. Time is the rate of change in Energy. The sun is our energy, and "time" moves forward as the energy is released. :)
Look at pictures of a Nuclear mushroom cloud... That's Time Travel! The Stem of the cloud is where time moved ahead rapidly......
Amy, you made a few nerds smile, and some other nerds didn't get it.
@@tigerstudios not correct as you suggest the rate of change in energy is constant. and also suggest that every sun creates its own time because all suns release energy. Time slows when i move fast through space, or go further away from a gravitation pull of the planet. IT HAS NOTHING TO DO WITH THE ENERGY RELEASED from the sun - we already know time is related to SPACE
@@reddevilsunited7780 Time slows in an accelerated frame or gravitational field (equivalent). So you have it backward. But that doesn't challenge the point you were ultimately making.
Michael R
You are so wrong, where did you learn that?
Dr. Carroll very correctly and nicely explain the time. I am grateful of him for such a wonderful presentation
Salamat po sa napakagandang explaination kahit mayroon akong konting hindi naiintindihan ay pakiramdam ko ay nasusundan ko ang iyong paliwanag kasi nararamdaman ko na tama ang iniisip ko sa mga sinasabi mo, halimbawa: Kapag iniisip mo na hindi ka masasakop ng oras, ang oras ay lilipas. At ikaw ay iyon padin, hindi maapektuhan ang iyong imahinasyon.
Ito pa ang isang halimbawang:
Makakalula mo ng future pero hindi ang ngayon, makakalkula mo ang future sa pag kalkula sa nakaraan.
Pero naka depende ang ibang sagot ibang pamamaraan ng pag kalkula
I believe that there is no now, only past and future. Time is always in flux, never stagnant. You lived in the past, yet every millisecond of time is always in the future. You can't exist in the present as that concept does not exist; only what transpired or is taking place now. Absolutely nothing stagnates because everything around it will not allow it to do so. In essence: To speak of a NOW is to accept that time can remain stagnant for any measures of time; this is not possible. Your Now is quite literally the FUTURE.
Dr. Carroll has that rare Professor Carl Sagan ability. The gift to know what he is talking about combined with the ability to dumb it down for the layman to understand. Many professors are genius academics inn their given field of expertise, but few possess the unique ability to share this knowledge with their audience without having a bunch of eyes glazing over.
Insidious Vidz That is true, but professors can learn. Oppenheimer was a lousy teacher at first, but ended up one of the best.
Very nice presentation about the philosophical aspects of time. I am currently reading Einstein's book: "Über die spezielle und allgemeine Relativitätstheorie" which is for me as a German a very precious book because Einstein's carefully chosen words about time and space are of course a German that does not exist anymore. It's unbelievable how precisely Einstein can describe his thought experiments only by words with very few sketches. This approach is totally different to the visual world of today. Professor Caroll has the same talent to illustrate very abstract but "real" aspects of life only by his very well chosen English words and statements that only a native speaker can achieve. But I am very grateful as after war generationperson who raised up in an English affine environment that listening to him is like as if he spoke in German to me. Danke!
What does he mean when he says the past, the present and the future are all equally real? In the past he was a small boy. Is he saying that the small boy still exists? In the future he will be an old man, if he lives that long; is he saying that the old man exists now? If not what makes the past and the future as real as the present?
@@matthewphilip1977 he means everything that occupies space must travel through space time. If time didn’t exist nothing could move or decay, likewise time is a real construct that flows all particles through it
Time is like the measuring of changes between distance and events spawning from a sigularity; and consciousness is the recording of the disorder as it flows. Entropy must continue so the record is stored in created
consciousness (example :a cell carrying out a function. The cell each time coded to make less mistakes than the last. Like learning to not destroy itself after continual repeated failures) by dark energy and the information is then evolved and replicated
so that the samething does not infinity repeat. My perspective on the reality of the universe for everyone is different and subjective to that organism\being ,for an example. Scientist states that viruses, bacterias or cells are examples of living organisms that even live in our bodies and they carry out functions. Human beings also carry out functions; but we look at cells and viruses as a lesser life form of life. If there are advance
or higher forms of life, they can also measure us human beings and state also that we are a lower form of life just as human beings may observe an ant as a lower form of life. However, because of this an ant may not be important to us, but if you try to squash an insect it will try to flee and preserve it's life thus means it's life must mean something to itself; but not to us. Even blood cells defend themselves when under a threat just as we do, but is the life of one blood cell important to us? Is the life of a human being urgent to a tree which is also a living organism. Human beings are the main cost for the destruction of trees whichin they've been here before we we're in existence. So are trees a higher life form than us? A more advance and higher life form may look at a tree and say this tree is much more important than a human being because it sustains life on this planet but human beings destroy the planet with human helping technology (depending on their perspective). All of this said humans may not be as prominent as we think If we remember the laws of physics breaks down on a quantum level. There are lengths like the plank length that are so small that it can be compared to the scale of the universe. So doesn't this mean that being that small you are in a universe of its own , within another observable universe but only observable by our knowledge by humans. If this is so then there must be other places the laws of physics break down also. If it does for the extremely small why not for the extremely big? Who is big and small anyways? We are small to our planet but our planet is small to our sun. This can go on and on. We are the size of a universe to an atom in our body ,thus means also we are big. However, this happens to everything everywhere. If there is space that has particles, those particles may be within an atom, trillions of atoms are in a cell (more than stars in our solar system) whichin cells are IN our blood ( 37 trillion cells). Our blood in our organs and muscles which is within our bodies. Our bodies may be within a house which is within a constituency, which is within a town, which is within a city/state/island which is within a country which is in a continent which is within a planet, which is within a solar system, within a galaxy, within A super cluster, which is within Galactic walls which is within the Cosmic web . "Everything is 'WITHIN' " which The Cosmic web itself is 'within' The Universe WHICH is 'within' a bubble or phenomenon that we cannot see. "Everything is within" something. Hold just a minute here though! We cannot see someone waving at us from an airplane. We only see the construct of the landscape, not the entities within them. Or an ant from the top of a sky scrapper, neither can we see blood cells attacking viruses n vice versa. Which is evidence just because we cannot see oxygen or detect an atom WITHIN does not mean its not there. The human eye cannot see U V rays or even oxygen and we are surrounded by it. So this means the Laws of physics as we KNOW it only applies to our subjective and objective reality. If u step back and look at the universe . We will only see the Cosmic Web of everything. Which seems to be all touching and connecting. Not until we zoom In does things seem to seperate. Just like a cell that make up our skin. Or a dog standing on an island. From far we only see the landscape , but as we zoom in other entities become observable. Inturn becoming a noticeable part of your reality. Things like Dark matter plays not with Morden physics and we cannot see it but it must exist because of the forces that pulls galaxies together and dark energy pushing entropy without the universe collapsing. However back to the Cosmic web. From a far everything is connected, but if u go close or zoom more is revealed within. The universe itself may be 'within' a muti-verse , another unverse, a blackhole, a quantum computer simulation or even apart of another living organism body that seems infinity large. But as we are universal size to an atom the universe can be a drop in the ocean or space to a greater being which most earthly beings cannot fathom or even believe because it is beyond preposterous. Even if your human eyes can go in front of it is to large or small to amke out. You cant see a mountain top from the exact bottom. It is to high in the clouds. Thus u cannot see the universe from one end to the other. The universe legs may be to long (just a joke ) .Somewhat though these are very much what it seems for the great reality. As laws of physics break down at quantum levels, entanglments, singularities and so on. There are dimensions that we cannot see and cannot detect things like :(earthly terms, but they seem to have more meanings) Super positions, past , future, the unconscious, concious thought, different colors of light , pure and dark energy etc. Please excuse my long reply , but this is just a brief explanation of not an objective or subjective reality. Which is infallible, but of the asubjective existence which seems verisimilitude.
I now know that as much as science interests and amazes me especially astrophysics...astronomy...I will never fully grasp it, if I still mostly struggle even listening to Sean...still enjoyable..thanks for trying Sean Carrol...does anyone know anything that someone, who struggles like myself, could watch and maybe find easier to understand.
Very interesting lecture. No doubt, professor Sean Carroll is not only very knowledgeable but also talented to explain complicated things to others in a very simple and understandable way. I am very pleased people can learn from such events and hope they (lectures) will grow over time.
Too bad he promotes gay propaganda. Didn't do it in this vid though
@@Gian-niwhat
Thank you Sean. Some people who think about such things go nuts like me. It's really nice to hear someone talk on these things who has an excellent mind and a noble character.
Hahaha
He's got a noble character?
Based on what? Your intuition? Your long friendship? What an odd damn thing to say.
How in the hell can you know anything about his character, is he yor friend?
must be the gold ring….
@ Ted Bates. Gee wiz Ted, you were practically shot without a trial for thanking someone and adding a personal compliment born out of gratitude and how YOU perceived the man's character based on his presentation! It's obvious you ought to be flogged immediately for LEAPING to such conclusions! 😶 I thought I'd chose the only emoji I've ever seen that portrays NO emotions. Hope I'm not flogged along side the likes of you Ted! 🤣🤣🤣 I hope that emoji was the appropriate one that expresses my view on the way you were fired upon. Good on you Ted for saying what you did and I say that because I appreciate your commending the presenter and for your humility in saying you can go nuts sometimes making sense of this sometimes very puzzling subject. That was a bit long toothed BUT there you have it. Over a year has gone by since your comment but if you look to your left and down at about a 30% angle you might be able to see me waving to you on that space/time graph 😁! Cya!
Eternalism - Where you know that all of your most embarrassing events in life are preserved forever.
This makes me feel so uncomfy right now :I I already have a hard time dealing with all the embarassing moments through out my life XD
and still I love the idea of Eternalism somehow...
Fml. 😂🤦♂️
Oh dear!
Well, in that case you were also always going to do those emparrassing things anyway, so nobody can actually blame you for it
@@pinesyeet Trrrrue.
Fascinating. I always considered the question of what is time to be the greatest of all mysteries. On the one hand, time, in its most superficial sense, is nothing but the measure of change. The minute hand of a clock is at 12, then is at 3. A billiard ball that was a foot away from the left corner pocket is now in the pocket. I was young yesterday; I am old and gray today. On the other hand, there can be no change -- the clock hand cannot move, the billiard ball cannot roll and my appearance cannot alter, unless there is time. Nothing can "happen" outside of time. So then, is time emergent as the manifestation of relationship dynamics among things, or is it fundamental and a priori? I tend to think the latter. Therein lies the profundity of the mystery that present science cannot answer.
Fred Alan Wolf has an answer. See clip on UA-cam: "Is time travel possible?"
i don't think time is a priori . imagine a place where is no phenomenon, no movement , no chemical changes , no matter , just space and time . is there time in such situation ? there is no change to measure so there is no time. time is present because there is change and time is measure of that change ,
I like the thought you put into this. I read what you wrote and thought myself what if we were one dimensional creatures within the time field. Space has 3 dimensions that we can experience, why couldnt time also have 3 dimensions that arent apparent to us. A one space dimensional being would see items appear and disappear within their point of space and it would be normal, just like we see the future appear and the past disappear as normal. Just a thought I had when I read your comment.
Sean Carroll is a freaking genius. He has a brilliant mind: the ability to COMMUNICATE this eloquently about a subject matter this complex is a sign of deep, deep intelligence. Verbal IQ is just as important as Mathematical IQ, alas without philosophy there is no physics. This is why, for centuries the field of physics was called "Natural Philosophy," and also why so many of histories most brilliant minds were philosophical inclined - Plato, Socrates, Aristole, Descartes, Leibniz, Newton, EINSTEIN, Goethe, Wittgenstein, Godel, Soyinka, Chomsky etc.
Bravo Sean Carroll. I look forward to watching more of your lectures. Astounding video! I learned a lot.
Sean Carroll has an impeccable sense of TIME on those cameras
Mind bending concept explained so eloquently and made so easy for a little brain like me to completely get it. LOVE YOU Sean Carroll
Nothing small about your mind. You have everything you need in it.
Wow! This is the best illustration of space time that I've ever heard. Most importantly I can actually follow and understand what he said! 🤩❤
He reminds me of an algebra instructor students lined up early to get for the semester. Even I got through the class with a good grade. However, I can't remember much, if any, of what I "learned".
Love it! Fantastic explanation with simple examples.
Time is like the measuring of changes between distance and events spawning from a sigularity; and consciousness is the recording of the disorder as it flows. Entropy must continue so the record is stored in created
consciousness (example :a cell carrying out a function. The cell each time coded to make less mistakes than the last. Like learning to not destroy itself after continual repeated failures) by dark energy and the information is then evolved and replicated
so that the samething does not infinity repeat. My perspective on the reality of the universe for everyone is different and subjective to that organism\being ,for an example. Scientist states that viruses, bacterias or cells are examples of living organisms that even live in our bodies and they carry out functions. Human beings also carry out functions; but we look at cells and viruses as a lesser life form of life. If there are advance
or higher forms of life, they can also measure us human beings and state also that we are a lower form of life just as human beings may observe an ant as a lower form of life. However, because of this an ant may not be important to us, but if you try to squash an insect it will try to flee and preserve it's life thus means it's life must mean something to itself; but not to us. Even blood cells defend themselves when under a threat just as we do, but is the life of one blood cell important to us? Is the life of a human being urgent to a tree which is also a living organism. Human beings are the main cost for the destruction of trees whichin they've been here before we we're in existence. So are trees a higher life form than us? A more advance and higher life form may look at a tree and say this tree is much more important than a human being because it sustains life on this planet but human beings destroy the planet with human helping technology (depending on their perspective). All of this said humans may not be as prominent as we think If we remember the laws of physics breaks down on a quantum level. There are lengths like the plank length that are so small that it can be compared to the scale of the universe. So doesn't this mean that being that small you are in a universe of its own , within another observable universe but only observable by our knowledge by humans. If this is so then there must be other places the laws of physics break down also. If it does for the extremely small why not for the extremely big? Who is big and small anyways? We are small to our planet but our planet is small to our sun. This can go on and on. We are the size of a universe to an atom in our body ,thus means also we are big. However, this happens to everything everywhere. If there is space that has particles, those particles may be within an atom, trillions of atoms are in a cell (more than stars in our solar system) whichin cells are IN our blood ( 37 trillion cells). Our blood in our organs and muscles which is within our bodies. Our bodies may be within a house which is within a constituency, which is within a town, which is within a city/state/island which is within a country which is in a continent which is within a planet, which is within a solar system, within a galaxy, within A super cluster, which is within Galactic walls which is within the Cosmic web . "Everything is 'WITHIN' " which The Cosmic web itself is 'within' The Universe WHICH is 'within' a bubble or phenomenon that we cannot see. "Everything is within" something. Hold just a minute here though! We cannot see someone waving at us from an airplane. We only see the construct of the landscape, not the entities within them. Or an ant from the top of a sky scrapper, neither can we see blood cells attacking viruses n vice versa. Which is evidence just because we cannot see oxygen or detect an atom WITHIN does not mean its not there. The human eye cannot see U V rays or even oxygen and we are surrounded by it. So this means the Laws of physics as we KNOW it only applies to our subjective and objective reality. If u step back and look at the universe . We will only see the Cosmic Web of everything. Which seems to be all touching and connecting. Not until we zoom In does things seem to seperate. Just like a cell that make up our skin. Or a dog standing on an island. From far we only see the landscape , but as we zoom in other entities become observable. Inturn becoming a noticeable part of your reality. Things like Dark matter plays not with Morden physics and we cannot see it but it must exist because of the forces that pulls galaxies together and dark energy pushing entropy without the universe collapsing. However back to the Cosmic web. From a far everything is connected, but if u go close or zoom more is revealed within. The universe itself may be 'within' a muti-verse , another unverse, a blackhole, a quantum computer simulation or even apart of another living organism body that seems infinity large. But as we are universal size to an atom the universe can be a drop in the ocean or space to a greater being which most earthly beings cannot fathom or even believe because it is beyond preposterous. Even if your human eyes can go in front of it is to large or small to amke out. You cant see a mountain top from the exact bottom. It is to high in the clouds. Thus u cannot see the universe from one end to the other. The universe legs may be to long (just a joke ) .Somewhat though these are very much what it seems for the great reality. As laws of physics break down at quantum levels, entanglments, singularities and so on. There are dimensions that we cannot see and cannot detect things like :(earthly terms, but they seem to have more meanings) Super positions, past , future, the unconscious, concious thought, different colors of light , pure and dark energy etc. Please excuse my long reply , but this is just a brief explanation of not an objective or subjective reality. Which is infallible, but of the asubjective existence which seems verisimilitude.
Here's my take on it-
We know that everything in the universe moves from low to high entropy(that's just how it works). Time is just the measure of the rate at which this happens and since we are all subject to it, we accept it as time. This predicts that time may have never existed before the bigbang because there probably was nothing to move from low to high entropy.
except that one infinitely dense speck, no?
@andrew gallovich i think that's the entire debate, whether space/time is primal or not. I see both sides, they both make good points but theyre also both severely lacking in evidence. Its mostly just philosophy anyways
Space matter and energy exist. Time does not. Time is only a perception. It is a measurement we take of the energy and matter in space. Very simple.
@@stevenash9282
Infinite Density = Absence of Matter
Thank you Professor!
I often consider the movement of time is related to a “time field” which matters that have time sensitivity, such as consciousness, move through it according to the field guide direction. The speed the consciousness move through time depends on the contents of the matters. Similar to mass moving through space according to gravitational field. Of course this may only belong to science fiction. Even though we now consider space-time together, certain field could have effect only on part of the property of space-time.
Say what?! 😂😂😂
17:17 Imagine 2 billiard balls colliding in empty space.
The scene looks the same forwards and backwards.
Until you zoom in : then you see a hot-spot on each ball.
The hot-spot is a record (memory) of the collision.
That is what distinguishes past from future.
(As Sean Carroll just said)
If you run the film backwards, the heat in the balls would migrate to a spot
then vanish after the collision. This is an extremely unlikely scenario. But not impossible. However, the chances would be 2 to the power a trillion trillion.
Can you tell me how you arrived at that number??
*" 'Time', he said, 'is what keeps everything from happening at once' ."*
*Ray Cummings: The Girl in the Golden Atom, 1922*
golden86 “You cannot enter the same river twice, because it is not the same river or the man.” Heraclitus.
Great quote about time. Still, time and dimensiions are physical allusions created by our brain. A more realistic model of the world is to consider it from the perspective of patterns of energy. The solar system, for example, is a stable space-time pattern of energy. Consider it, for example, as a single material object., like an atom or a clock. But time is not an independent entity, it does not exist without spatial movement (like Sean moving his hands). What we misinterpret as "real" time, e.g. the passage of time, depends on our memory - it is a psychological process. We compare our "present" with our memories automatically, and realize they are not the same. Our brain generates the concept of time to account for the psychological discrepancy - it is generated by our brain to explain why we are not now where were a few seconds ago.
@@thomassoliton1482 the last bit of your comment is rather poignant.
Mindstorms44 Firesign Theater: "How can you be in two places at once, when you're not anywhere at all?"
golden86 the presupposes the natural phenomenology of time.
0:15 me, age 10, about to tell my mom I threw up in the middle of the night
OML same 😂😂😂
🤣🤣🤣
What a fantastic lecture, thank you
“The universe is both each frame of the movie and all the series of the frames together.”
When math becomes philosophy. Absolutely beautiful.
First time seeing this video, and I got to say, I’m not very smart like college level or anything like that, but I always been a sucker for un-answered questioning and you just made my brain do BAM! This explains a lot
Ask yourself: "How do I experience time?" On any view time is a wholly subjective experience. What else could it be but a word that conveys one or another experience?
Rather obviously " the universe" - like any other universal, is imaginary in that it cannot be directly immediately personally experienced *A* "the universe" which is a vague unfocused idea - and no more than an idea
The man is wonderful to listen to.
I've thought about some of the issues that Dr. Sean Carroll discusses in this video. I'm nearly 80 years of age, during which time I've thought a great deal about them. Dr. Carroll's assertion that we experience the present moment as "real" is not the way I experience the present time. I've come to believe that our experiences are conditioned by how we are constructed by reality; namely, the way our brains function to construct the present time. I agree with Kant and Schopenhauer et al., insofar as the world we experience is incontrovertibly due to our brains experiencing space, time, and causality a priori. That is, space, time and causality are a single structure upon which we drape our experiences, both "inner" and "outer" experiences. As a result of my own thinking about these matters for many decades, I experience the present as both a real and an imagined reality simultaneously. Thus, I don't experience the present as merely "real", but rather as miraculous. We can come to no definite conclusion about the constitution of the self, nor can we about the constitution of space-time, but we can experience the miraculous continuously, and that is not inconvenient for me.
This chap explains things brilliantly , well interesting , fascinating , great stuff 🙂
Thank you , David!
Time is like the measuring of changes between distance and events spawning from a sigularity; and consciousness is the recording of the disorder as it flows. Entropy must continue so the record is stored in created
consciousness (example :a cell carrying out a function. The cell each time coded to make less mistakes than the last. Like learning to not destroy itself after continual repeated failures) by dark energy and the information is then evolved and replicated
so that the samething does not infinity repeat. My perspective on the reality of the universe for everyone is different and subjective to that organism\being ,for an example. Scientist states that viruses, bacterias or cells are examples of living organisms that even live in our bodies and they carry out functions. Human beings also carry out functions; but we look at cells and viruses as a lesser life form of life. If there are advance
or higher forms of life, they can also measure us human beings and state also that we are a lower form of life just as human beings may observe an ant as a lower form of life. However, because of this an ant may not be important to us, but if you try to squash an insect it will try to flee and preserve it's life thus means it's life must mean something to itself; but not to us. Even blood cells defend themselves when under a threat just as we do, but is the life of one blood cell important to us? Is the life of a human being urgent to a tree which is also a living organism. Human beings are the main cost for the destruction of trees whichin they've been here before we we're in existence. So are trees a higher life form than us? A more advance and higher life form may look at a tree and say this tree is much more important than a human being because it sustains life on this planet but human beings destroy the planet with human helping technology (depending on their perspective). All of this said humans may not be as prominent as we think If we remember the laws of physics breaks down on a quantum level. There are lengths like the plank length that are so small that it can be compared to the scale of the universe. So doesn't this mean that being that small you are in a universe of its own , within another observable universe but only observable by our knowledge by humans. If this is so then there must be other places the laws of physics break down also. If it does for the extremely small why not for the extremely big? Who is big and small anyways? We are small to our planet but our planet is small to our sun. This can go on and on. We are the size of a universe to an atom in our body ,thus means also we are big. However, this happens to everything everywhere. If there is space that has particles, those particles may be within an atom, trillions of atoms are in a cell (more than stars in our solar system) whichin cells are IN our blood ( 37 trillion cells). Our blood in our organs and muscles which is within our bodies. Our bodies may be within a house which is within a constituency, which is within a town, which is within a city/state/island which is within a country which is in a continent which is within a planet, which is within a solar system, within a galaxy, within A super cluster, which is within Galactic walls which is within the Cosmic web . "Everything is 'WITHIN' " which The Cosmic web itself is 'within' The Universe WHICH is 'within' a bubble or phenomenon that we cannot see. "Everything is within" something. Hold just a minute here though! We cannot see someone waving at us from an airplane. We only see the construct of the landscape, not the entities within them. Or an ant from the top of a sky scrapper, neither can we see blood cells attacking viruses n vice versa. Which is evidence just because we cannot see oxygen or detect an atom WITHIN does not mean its not there. The human eye cannot see U V rays or even oxygen and we are surrounded by it. So this means the Laws of physics as we KNOW it only applies to our subjective and objective reality. If u step back and look at the universe . We will only see the Cosmic Web of everything. Which seems to be all touching and connecting. Not until we zoom In does things seem to seperate. Just like a cell that make up our skin. Or a dog standing on an island. From far we only see the landscape , but as we zoom in other entities become observable. Inturn becoming a noticeable part of your reality. Things like Dark matter plays not with Morden physics and we cannot see it but it must exist because of the forces that pulls galaxies together and dark energy pushing entropy without the universe collapsing. However back to the Cosmic web. From a far everything is connected, but if u go close or zoom more is revealed within. The universe itself may be 'within' a muti-verse , another unverse, a blackhole, a quantum computer simulation or even apart of another living organism body that seems infinity large. But as we are universal size to an atom the universe can be a drop in the ocean or space to a greater being which most earthly beings cannot fathom or even believe because it is beyond preposterous. Even if your human eyes can go in front of it is to large or small to amke out. You cant see a mountain top from the exact bottom. It is to high in the clouds. Thus u cannot see the universe from one end to the other. The universe legs may be to long (just a joke ) .Somewhat though these are very much what it seems for the great reality. As laws of physics break down at quantum levels, entanglments, singularities and so on. There are dimensions that we cannot see and cannot detect things like :(earthly terms, but they seem to have more meanings) Super positions, past , future, the unconscious, concious thought, different colors of light , pure and dark energy etc. Please excuse my long reply , but this is just a brief explanation of not an objective or subjective reality. Which is infallible, but of the asubjective existence which seems verisimilitude.
I can't follow the other physics or science channels but professor Carroll is able to put himself in the shoes of people with mathematical talent. It's possible certain topics are so much only math that you can't explain them any simpler without getting very vague.
One thing I've always found fascinating is the notion that there are no events, just arbitrary points of perception labeling a this versus a that, or a now versus a then.
What an amazing documentary! Thank you very much Prof Caroll!
I never heard a very good explanation about the relation beetwen space and the time , and how these caracteristics behave itself one to another , i am impressive , pretty good job teacher Sean carroll !!
Hi Bruno, thank you so much for your kind feedback! We truly pride ourselves on our professors and the depth of our content and are very glad you're enjoying our offerings. Thanks for being a fan!
@@Wondrium that's really my pleasure .
Wow, what a great lecture.
This was a truly great lecture, which certainly opened my eyes to a few aspects about time which I was wrong about.
The only thing is that time is always described as something that passes us by at a particular rate which depends on where you are and how fast you are travelling. The reality is that time itself does not 'flow'. Moreover, it is like space in that we travel through it. The difference is that we can travel through space in any direction but we can only travel through time in one direction, albeit at different speeds. What the human mind finds hard to accept is that time is not a fundamental unit of the universe but speed is. We see speed as a construct of distance divided by time but the truth is that time is a construct of distance divided by speed, where distance and speed are the fundamental units, not time.
So if you stand still then time doesn't elapse?
It is impossible to 'stand still' in this universe. You are always on the move relative to another observer, and that means on the move through time as well as space.
@@spyrosspyrou5809 Please help me understand if I got the point correctly. I am not a physicist nor very well educated on such issues. I am just trying to understand the basics... Time is not fundamental since it is created due to the expansion of the universe? Time was born with the big bang and for as long as the space created expands, we experience a linear progression of time towards a specific direction? So Is time a byproduct of space creation?
@@kdawgg83 impossible to stand still. Where could you find a place where you are standing still?
@@spyrosspyrou5809 Also, the element of entropy
Existence is nothing other than a flipbook.
Already drawn from beginning to the end. It is very simple.
Better than a flipbook, think of it as a sculpture, where events unravel from the bottom of the sculpture all the way to the top. Yet the sculpture is static.
Our consciousness arises when particle X in our brain, at one slice of the sculpture, appear at point A, and in the next slice of sculpture, appears at point B.
This gives rise to our consciousness and to the illusion that there is a past, present and a future unfolding.
My individual experience of spacetime is sometimes way to fast, so it seems to be that the measurement by my mind is not detailed enough and not fast enough to expire it slower. I assume, that the clock speed is the same for all of us while watching the video.
I wish it could be possible to expand the individual experience of time, without losing any real second. Or while "pending"/waiting for something, to skip real seconds.
Consciousness makes the flip book activate into motion. It’s just multiple moments like pictures being put into motion.
Here is what puzzles me about present time and how Time “flows”.
What is so special that I’m sensing present time right now? Is it like I’m alive and flowing on a Big Bang wave that is heading into the future with everybody else around me riding on it and experiencing?
But what about before I was even born?; “present time” was still there and existed for everyone else prior. A person from the 1970s for example was in the “present time” the same way as I am now writing this. It makes me want to think that time does not “flow” but everything that will happen is already written and the people who are alive right now are just experiencing it which in turn is relative to each person.
Are we riding in the Big Bang wave of time? I’m not sure about that since time is distorted with gravitational forces everywhere in the universe and where there’s a lot of gravitational force time can distort. What about planets or objects that are really close to a black hole of which distorts the fabric of spacetime? Probably for them, we are in the year 5061 while for us, we’re still in the year 2020.
The notion of time as well as consciousness is very confusing and hard to grasp from many point of views.
We all are given a short time to find something or someone. Some find it right away while others never find that something or someone but we all have a chance.
@ *Ted Bates*
The chance being the quantum mechanical probability of the shrodinger’s cat.
BTW Galileo has a very precise manual stopwatch , as precise as any manual stopwatch we can make today. He filled a container with water. It was equipped with a small spout he could block with a finger. Measuring time he let the water run the measured time and then measured the weight of the water that ran out. So a clock with no pendulum or springs.
I'm glad I found the time to watch this.
I agree with those commenters who say he communicates well. Easy to listen to.
I took a picture of rain on a hand rail years ago. the Boka effect of soft focus in the close area, sharp focus in the fore ground and further forward it became more and more out of focus. I ultimately renamed the photo, "Time-line", because of how close to your past things are fading from your memories while in the present things are in sharp focus. The further forward you looked the more defocused and darker was the future.
Mats Borgkvist says:
It only applies to those who have such a notion of what time is. For my part, I mean that Professor Sean Carroll has confused the word time with the word duration and aging. Because I have no problem with time, as it is 'up to me' to choose which times I want to travel in, because it is I who chooses the time form I want to be in, which everyone can do and has done since time immemorial by choosing which verb form we should add our verb to the event in our languages that indicates in what time we want to be in. It is thus easier to determine the time to travel to than to get to places. I have a hard time keeping up with the professor because I can go as fast and far as I like without any problems. The problem is that knowledge as a sect has kidnapped the word time from our human languages and given the word a completely different meaning than the original, the one who does things and according to our intellectual property can not make clocks, namely measure time and own it with a stolen word that we humans exclusively already own by tradition but Galileo and Newton and Einstein have managed to push away with their original meaning when they together committed the copyright infringement in Pisa in 1610 and the rest of us let it be accepted by church opponents who should have known better than that be seduced by a Protestant mob. This in respond to the professor Sean Carroll's statement:
”We move through space as we like, we can choose to go to some other location in space, we can’t choose to go to some other location in time, we inevitably move through time at the rate of one second per second. Time is relentless whereas space is sort of ’up to us’ how to move in it. That gives us a certain perspective on what the world is.”
Fantastic lecture!
I'm sure I read somewhere once that time is effectively another manifestation of the force of gravity. Moving forward in time is traveling along the curvature of space-time effectively propelled by that same force. The constant which governs the predictable speed at which we do that is the same constant which governs the speed of light - meaning if you were to simulate our universe and only change that one constant, you would also change the speed of time. Does that ring any bells for anyone else?
Think about what it would mean for "moving forward in time" to just be shorthand for "traveling along the gravitationally induced curvature of spacetime". That would insinuate that time, itself, is actually created in discreet quantities by gravitational fields, and the more gravity there is, the more time there is. I.E. you get close to a singularity, you have to literally travel through more time to get anywhere. While it makes sense and seems to track with (at least my own understanding of how GR works), I think there is something fundamentally broken about that causal relationship. IMO, gravity does not cause time or spacetime curvature, it's the other way around - Time causes the curvature of space, which we call "gravity". I know it sounds like the same thing, but I think the distinction is important. I personally think Time is literally the only fundamental force in the universe, and all others are emergent phenomena. Anybody else wanna throw in an opinion/argument here?
Yes! Time is gravity made physical!
I don't know how Sean even sleeps at night. His brain never stops
At 6:47 - the state at an instant - a snapshot - is enough to predict what will happen next... Hmmm - BUT the next instant depends on velocities... and I have to do something special to know what a velocity is from a snapshot - I have to attach to every 'thing' (?) it's velocity at that instant. On the other hand, if I take two instants - preferably infinitesimally close in time - I will be able, merely by measuring positions with infinite precision, to know the velocities I'm going to need for my prediction
My personal thoery on eternalism and presentism is that one creats the other. Futhermore the concept of time moving in the opposite seems to be unrealized but, to me it has to be doing this to account for the reaction between eternal and present that gives us the moment we exsist in.
Dr. Carroll is such a pleasure to listen to. I have seen him on many documentaries.
Did you guys see that all 13 different time pieces on the set were set at different times??
I noticed the discrepancies between most of the clocks, too.
I think you overdid it a bit with all the clocks in the room! :) But great lecture
why did they have to make the background so tasteless?
just a white room or a green screen with post-production images (PBS Space time style) would have been much better than this outdated school director's office
The setting, the cameras, the feeling that his movement and gestures were choreographed totally distracted me from anything interesting he had to say.
good thing the other 75000 people that watched this dont care.
You guys seem to complain about the silliest things
He said we think of the past as 'over with'. I think most of us think of it as over with in terms of how all the matter and energy was arranged, but the matter and energy are not over with, they are here now, but in a different arrangement.
I refered to Buddihist philosophy Sir.It really was helpful not only to map out the Universe but find your own self within.
I’ve been thinking, and I came to the conclusion that in fact the term “time” is confusing. We think about what “time” is, but in fact there is no time, only “time-flow”. Time is not a thing, but rather a process. I think helps understanding things by using this terminology, helps us asking the right questions. Space is the water, and time-flow is the flow of the water.
tiredness correlation with day/night time cycle
I don’t know if “process” is the best word to use to describe time for this theory
I first heard about Sean when I watched Joe Rogan. He's amazingly good at explaining very complex stuff for dummies like me
The time is , what is measured by the clock (Albert Eistein).
By the number of the periods of harmonic oscilation, covering the measured section of the causal sequence.
The period of the harmonic electromagnetic oscilation giving closed persistent energy flux of the elementary particle of the mass m[kg] is
T'[s]=htrans/(m.c^2)= 1/omega
or
T[s]=2.pi.T=1/f[Hz]
For (invariant mass) electron, T is in the range ~1E-20 [s]
The higher is the elementary particle mass, the shorter is the period T.
More and more shorter and shorter periods to cover the same section of the causal sequence.
The more and more slow is the flew of the events, measured by such a clock.
The measured(!) time slow down with the mass m. Keeping the causal sequence to some degree independent from measurement by the clock. Not fully.
Time term is itself a confusing term, time as we use in general terms is just linear progression, but nothing else more than that.
But if you want to see past present and future time is rate of decaying or creation. It's then consider as the fourth dimension,
Distance speed and time are all linear and depends on each other, but this is formulated only when we are covering point A to Point B.
Rate of change in space is happening continuously because of which we are growing, but if we are moving between points it's just linear only.
"Time... can be a cruel mistress. In its relentless march forward, it robs each of us of many things. Moments, experiences, people. Time can take them all from us, in an instant. Such things are gone forever, unless they live on within our hearts, our minds, our memories. For all its cruelty, time can also be a great teacher. Through the changes left behind in its wake, we can learn, we can grow, we can come to understand those truths that have eluded us in the past. Only then can we truly understand ourselves."
Beautiful
question about "presentism": what is the duration of the "current moment" - does it have a finite duration, or is it a point source, so to speak? either view seems to lead to philosophical and physical contradictions and paradoxes.
I've been thinking a bit about this, and I think the answer, atleast how we experience it, is that it's floating. When you think about it, an absolute current moment is the same as the absolute middle point of a wheel. It exists, but it's not possible to get to it with anything other than math. A rotating wheel will have a point in the middle of it with 0 width, depth and height that everything else rotates around. As an example of the current moment, try putting on a song and try to distiguish certain points as moments. It won't work, the moment will be what you just heard over a very small timeframe that isn't 0.
@@pinesyeet Thank you for your reply. If I understand what you are expressing, we need to consider the interaction of two different things, namely what the physical reality of time is, AND how our brain perceives time. Presumably the underlying physical reality of time could theoretically be measured accurately with the proper instrumentation, but our brain may distort the perception of that reality to a lesser or greater degree. To see this more clearly, we can use the well-studied model of how the brain extensively processes a real image (and also the amount of time it takes the brain to do so, according to "The Human Brain Book, "it takes about half a second for us to see an object consciously").
@@barryzeeberg3672 Yes I think you're on the right track. Without saying for certain, I can imagine that if our brains suddenly worked twice as fast, time would seem to slow down around us while we felt normal (if that makes sense). In this case, a moment for this double speed person measured by a normal speed person would be half as long. This leads me to believe, again without certainty, that time and moments only has its size because of how we perceive it. If we went outside our universe and looked at it while we turned time faster and faster towards infinitely fast, it would seem like every moment that happens goes towards being 1. What we know from experience is that with the time constant, this isn't exactly true, as we have moments happening after each other. What you can say then by looking at our universe is "ok, then moments are just like a stack of paper on top of each other", but that isn't practically true either since we don't experience going from a still-frame to the next, but rather have fading back-end of the moment that becomes the past and gaining front-end of the moment that becomes the present. This leads me to believe that moments are a fluid thing, atleast for all intents and purposes how we perceive it.
Time is something that cannot be regained by anyone whether he is rich or poor.
But many of us don’t value it. At Least try to spend it worthfully going forward by knowing the meaning of it from this video.
This is incredibly fascinating and easy to follow. Wow
Thanks to prof Carroll for yet another very interesting lecture.
Hello Lorne. Thank you so much for your kind feedback! We pride ourselves on our professors and are very glad you´re enjoying our offerings. Thanks for being a fan!
As a non physicists(like myself), I really enjoyed this.
Well done. I just came across this . . . It reminds me of a phrase I used to use, (Pardon the grammar) "I can tell you what time it is. Can you tell me what time is?"
Thanks a lot dear ....for such an amazing exploration of time
"It always is good to go back to what clocks do."
-Professor Sean Carroll 2018
reikimonster - sure. But time still exists even if every clock stopped working.
@@dsbiddle oh...kay?
Thank you. Decent lecture. What was not addressed was the connection between time and consciousness. When can only perceive things within a stream. Your lecture for example. If we had a more expensive consciousness and a more efficient language we could perceive all of your lecture in a shorter time. So time and consciousness are directly connected. Eternalism is not feasible given our current state of consciousness.
Presentism, arguably, is a subjective understanding of time, while eternalism is an objective one.
@@aunri
Presentism is material. Eternalism is immaterial. A material reality is contingent upon an immaterial reality.
Both the recollecting of earlier moments and the expecting of later moments make this present change seem to be a movement from earlier moments to later moments. In other words, this recollecting and expecting makes this present change seem to be a "movement through time".
However, as both earlier and later moments aren't presently anywhere, this present change cannot possibly be a movement through time.
Change itself is logically beginningless and endless, and is therefore timelessly present....
time is rate of change of reference object's location in space. In manual clock when needle moves from 0 to 1 and so on, we count it in a unit of time called second instead of unit of distance called for example mm or cm. In digital clock when electrons/photons change their location so that 0 becomes 1 ans so on we call it a second. In older times (even today) stars and planets were used as refernce objects to make sense of the passage
Sean is my fav nowadays.
Lawrence Krauss is also cool.
Too bad Richard Feynman is gone.
I also like them, but I like Michio kaku better. Even if he has flaws at politics, I agree with Kaku on science and philosophy.
Feynman was a different Time.
Leonard Susskind and Juan Maldacena are my favorite current physicists. Sean is pretty cool too though.
Jim Al-Khalili is my favourite.
Some of his BBC documentaries are epic.
ua-cam.com/video/KFS4oiVDeBI/v-deo.html
He's best on his own.
In his element (pun intended)
I skip the ones that incorporate 'the public'.
Can imagine a BBC committee coming up with that idea.
@@alexisjanetcook1477 #metoo . Athough he was never accused of rape. Calling every unpolite touch "rape" is degrading the pain and misery real rape victims have to go through.
A great thought experiment might be, what we would understand about time, if the speed of light was closer to everyday speeds (say 200 mph). Would you be able to meet someone at a given time, if they drove faster than you? Would we think of time as constant and reliable? How would our intuitions work?
Still can't get to the speed of light with mass.
Nothing with mass can travel at the speed of light because it takes an Infinite amount of energy to do so, yet things without mass, like a photon must travel at the speed of light.
Things move in one direction only.
In whatever direction a thing is moving,
it is but one among an infinite number of possible directions.
The direction in which a thing is moving can obviously change but
whatever the new direction it is always one direction.
For the universe to appear as though time were running backward
everything in the universe would have to have its direction reversed exactly.
That would take twice as much inertial energy as currently exists in the universe
(to say nothing of the difficulties involved in arranging for it to happen).
Time is the concept we use to simplify the vast complexities involved
in thinking about the movements of all things relative to each other.
Time is not a thing-in-itself (like most people imagine).
Time is a concept only.
The concept is so useful, convenient and so deeply embedded in human psychology that
most people simply cannot overcome their
culturally induced lifelong belief in its objectivity
to see the truth of the reality:
there are only things moving relatively.
Planck length currently dictates our smallest measure of time. But time may indeed be indeed be infinitely dividable. On the other hand we do seem to be finding lower limits for other measures. So the time question may solve either way eventually.
I am interested in the future as that is where I intend to live for the rest of my life.
Wonderful lecture I must say!
Physics and Wittgenstein. The closer we come to grasping Time, the more elusive it becomes, and we are always in need of the language for it; the two working in tangent continually. 🤔
I think like professor Lewis propose the uncertainty principle mean we can not know both sếp and direction of particle or we have time-space is like a hot potatoes we either hold on to space if we know it inside out otherwise we have to clinch on time so we don't get lot we have to hold on to the calendar that we had when we last travel until we know the city
When does the future begin? When does the past stop? We are always at the same time, in the past, in the now and in the future...
If I did understand presentism right, then "now" is when you "freeze" all movement in the entire universe, and then you call this moment "now". When there is some change or in this exemplification, when you "unfreeze" the universe and "freeze" it again (after something has moved) you get the new "now" and the moment before is just a memory.
Contrary to the theory of eternalism, in which the past and future exist simultaneously but at another place of time because you see time as a dimension.
But in both cases, you will never experience the past or the future, because the future is just a prediction or in the case of eternalism, something that happens at another place in time and the past is either just a memory or sth that happens at another place in time as you are.
Therefore, the past doesn't stop because the past always was or is at another place in time and the future will never begin because it will ever be the prediction or another place of time.
We are at the same time neither in the future nor in the past. We are always in the now.
I have a similar question about existence and non-existence.
I love the 'subtle' theme of time being hinted at by the conservative use of clock props
I'll admit that I found the 'sesame Street' level set design a bit of a distraction. But I honestly loved that they took the time and effort with it. An awesome vid. 😊♥️
Thank you for sharing this that was a very interesting topic. Very well presented. I enjoyed it.