What Time Is It In The Universe?
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- Опубликовано: 27 сен 2024
- Check your watch, what time is it? But wait, you've actually been moving and accelerating, and according to Einstein, everything's relative. So what time is it really? It all depends...
Just don’t try this as an excuse for being late… No one seems to accept “Sorry, I was rushing over here but the time dilation caused by my acceleration desynchronized our clocks” for some reason.
The one thing I can state about time with a high degree of certainty... it's time for me to go to bed.
you & me both....yawn
Awesome explanation, mostly comprehensible by someone such as myself with very little education in physics. When you say our clocks are slow by about 30,000 years, it makes me feel that our minds are hopelessly limited.
But it's not necessarily a bad feeling.
It is humbling to be shown clearly that we can't know certain things. But at least there's always more to know.
+Fraser Cain ha
That was awesome. Stumbled upon it, but now a subscriber!
Ive had many discussions about this subject , and now i know where to send those who argue universal time is no different to mans time.
Time Dilation is a very real thing and you have explained it beautifully
Thankyou :-)
MC Fraser!! I would buy your album!!
Definitions of Time and Space are tons of fun to discuss. What is "Space Time"? Limitless perhaps as it relates to speed (a human term) and time (by what measure)?
Great video.
PS: How many times have you heard Niles jokes?
God, even your car parks look nice!
I think this was shot at our local college. It looks like a ski lodge. :-)
Great Video... but I'm pretty sure that is not the Whirlpool Galaxy at 2:30
Also what happened to the text with witty jokes in the background? I liked those.
I liked the subltety of the text... but fair enough.
So did you just forget to remove the placeholder photo for M51?
You guys should make a video composed by the bloopers at the end. That would be awesome. ;)
I second this.
I'm glad to hear about that, because apart from being very informative you guys are also funny at the very ending of each video. ;)
I would explain relativity in almost the same way , but take more samples . And I would also explain that the constant speed of light is the cause of non - simultaneous events , in this case that you explained with flashlights , and non - simultaneous are acceptable only if the speed of light in constant (which it is ) and for that speed of light to remain constant , the time should dilate and that makes to appear to the person who is traveling 200.000 km/s faster then you (supossing you are standing on the earth ) that events outside are happening faster then normal , and you see the events inside the vehicle running slower (this is also because time dilates to prevent any object to achieve the speed of light or even pass it ) , and this slowing of time inside the vehicle is what makes both parties to be right when they claim that the event happened in different times . The person inside the vehicle can travel to the future of the people outside the vehicle, and in a way it would be like the outside the vehicle people`s future is the past of the people inside the vehicle , from the moment they achieved near the speed of light.
The universe is expanding so, I assume the galaxies are also expanding with the birth of new stars and do they occasionally collide?
Thats the first time i've ever had a long posing question answered, and i've asked it lots of places.
The 4d beings meantioned in another video could find the center of the expansion, so that part of the universe must be moving slowest and experianced ( ignoring the relative bit ) true age of the universe.
So my question was as we've been moving how can we possibly know the age of the universe as our reference frame is out.
Knowing our speed to the background radiation has finialy answered it. Thanks.
My only way of understanding this is the following:
Imagine a table with 2 pieces of meat on it.
We take one of the pieces and we put it in the freezer. The other we leave on the table. The meat in the freezer will stay "younger" (will not rot as fast) as the meat on the table. But both the clocks of both meats will tic at the same rate.
We can argue that time for the meat in the freezer passes slower cuz its in the freezer, the meat in the freezer can also claim that its time is passing normaly and its not in the freezer - its the rest of the Universe that its in the heater instead and its the time for the rest of the Universe that's passing faster.
So ultimately we have 2 completely diffrent concepts of "time".
We have time as defined by how quickly the laws of physics are applied on an object. For us is applied normaly for the freezer they are applied slower, cuz there is less energy there (or visa versa).
And we have the idea of global time, as measured by the 2 clocks.
If we now switch that analogy to the Universe, we have 2 types of time.
We have proper time that's measured by each observer. And we have global time which is really there because every object is moving at the same speed in spacetime. All object in spacetime travel at the speed of light. Some more in space or in time but as a whole, every object is moving in spacetime at a single value.
So since every object moves in spacetime with only one speed that can't be changed (only the vector can change not the value) then we have a global time measured by spacetime intervals.
So if we could define a "time 2.0" then it shouldn't be measuring seconds, it should be measuring spacetime intervals. And only measure seconds when speeds are extremely slow (like those here on Earth). Where seconds and spacetime intervals become very closely equivalent.
Sure spacetime is hyperbolic. That messes up with our intuition of seconds. But that should be a problem for us to define a new type of global "time". Lets not be completely ridiculous.
I've got a question, is this a pre determined universe? General sense might not apply to this, but if universe is a close system then future and past are all part of it. If not, then is this a multiverse? Which may be defined as other set of permutations of bodily interactions in time. A yes in this universe might be no in the other and this happens for each and every fraction of time( plank?, another question maybe).
Time is relevant as to where you are when it is actually happening. Whatever will happen in the future has already happened as in the past and present. It's simple, it's where you are in time. Some people are gifted with the spiritual energy to advance in time or go back in time which explains the ability of prophets to predict future events. Look up the history of Edgar Cayce as an excellent example.
1:05
Entropy _always_ increases ...except for *crystals*.
was this shot between 3 and 4 PM your local time? hehe! I was noticing the shadows..
But does he know what day?
Amazing videos... So let say atoms decaying process is also affected by this?
Let say I want to travel at near speed of light, I would not be able to keep track of the "real" time... another space travel issue I guess.
The math is straightforward so as long as you keep track of your relative
velocities you can calculate the difference in time… this is already an issue with GPS satellites which, because they need extremely precise clocks, have to compensate for time dilation or they become significantly less accurate.
Question: This weekend I watched the movie "Interstellar", which despite being fiction, has a high level of scientific accuracy thanks to the cooperation of scientist Kip Thorne, among others.
In the movie there's an interesting case which I wonder if it's theoretically possible: Planet Miller is orbiting a black hole called Gargantua, but they discover the planet is so close to the black hole that the gravitational pull causes severe time dilation: each hour on the surface is seven years on Earth (based on the principles of relativity).
Is this theoretically possible? How?
After some doing some research and discovering that it theoretically IS possible, I'd like to rephrase my question: What causes gravitational time dilation? Why does time run slower when experiencing more gravity?
Everything is relative--except for the fact that everything is relative. That's absolute.
+Fubar AlAkbar all things in moderation, especially moderation
In school time passes by slowly, is this the explanation to this phenomenon ?
One thing is definitely certain... there are far too many rap references by a balding white guy w/in this video. That made time almost stand still for me.
Both Time and Space is infinite but as Humans only notice its finite.
I just asked you a question on twitter! ^_^
And reminded me on RUclips? :-)
@@frasercain Of course! I don't delete these XD
I know that we now have evidence for relative time in the form of GPS and the decay rate of muons moving at high speed and probably other things that I'm not familiar with. What I want to know is how Einstein came up with such a hypothesis? Was there previous evidence before he published special relativity or was it a wacky idea that was only confirmed later?
Oh cool. Cheers :D
It's howdy doody time!
I have asked this question about time to myself for so long. TIME IS JUST CONFUSING WHEN IT COMES TO RELATIVITY STUF ARGHHHHHHHHH
What time it is? Adventure time!
i thought this video would contextualise what it means to talk about the age of universe when time is relative. cause idk. maybe its super simple but i still dont know. im disappointed
What time is it?......SPACE...TIME......Einstein said they are the same...
Sorry I'm 30,000 years late, boss. I've been lagging.
Blame time dilation... again.
Well I think that Time it's self does not exist. It is only a theory and a thing we use. That being said, I belive that the world controls it's self and time travel does not exist. No matter how much electrical power you release or how much gravity, light, size speed or whatever, time travle will always be impossible. Even if time does exist, nothing would be able to create a rip in time where paradoxes can be created. If time travle existed, it would have created paradoxes for all of eternity.
Really nicely done--thank you. I like how you clearly illustrate the strange way how very same light ('that light beam coming out of your car's headlights') is the same speed for things moving at different speeds (e.g., my car, the other person in their car)..I like the ease with which you also connect this to time dilation and spatial contraction.
I usually illustrate this with cars as well (and trains), But what I also like to do is make clear this doesn't happen with other moving things. I like to give a contrasting example involving things which are not light:
E.g., imagine a child sitting in the back seat of a car while tossing a ball in the air. For them, the ball will simply move up and down, and seem not move forward or back (or not significantly anyhow), But to someone standing on the street, the ball will seem to have moved forward.
Say the child starts tossing the ball into the air in front of them as their car passes a road-sign. By the time the ball lands back in their hand, the ball will have moved along the road beyond the sign (by being carried along by the car). This means that how far the ball moves (over the same time) varies depending on who we pick to judge it from (the car, the road). As such, the ball can moving in a direction for one person (someone on the road) and not moving that direction for someone else (the child in the car).
With light, this doesn't happen. There is no difference in how far light travels in the same time depending on which one we pick. If light moves according to someone on the road, it moves at exactly the same speed according to someone in the car. This is one counter-intuitive consequence of relativity. That time and space alter as a result is another counter-intuitive consequences.
However, one thing I notice you don't address, and perhaps it is too hard to do in such a segment, is a further counter-intuitive consequence: the resulting time dilation (slowing) and length contraction of relativity is reciprocal: For me in my car, your time is slowed. But also, for you, my time is slowed. (I take it this also leads to the twin paradox, although the mathematics that describe it also solve that paradox).
Sean Power I've seen your 'ball in a moving car' type scenario used before, usually with light bouncing between mirrors on a train and the difference between an observer on the train and one stationary on the train platform. The nice thing about that is that you can use that scenario and the pythagorean theorem to simply derive the Lorentzean transformation that are central to the mathematics of relativity.
The twins paradox is as you describe it, that intuitively both twins see the other one ageing more slowly. The resolution comes from the fact that one of them needs to accelerate and 'decelerate' a couple of times to travel away from and back to their twin, while the other one stays in an inertial rest frame. It is the acceleration that provides the resolution to the paradox.
Can a shadow move faster than the speed of light?
Sure, but the information about the shadow can't move faster than the speed of light.
all particles are virtual
So if we make space longer and time slower... light will go faster?
Thank God I choose to study Biology not Physics... I'm to stupid for this.
No, light always goes exactly the same speed. Length and time need to change to compensate.
So why do scientists say the universe since big bang is almost 13.8 billion years. Isnt that an absolute?
It's roughly 13.8 billion years depending on how much time dilation you've experienced.
I know what time it is.
18:09
I didn't know you would respond. HERE I COME!
You and Michael Jackson, NOW IT'S 21:00 BRUH!
i think the universe is nothing so it has no time, although the big bang has it own time.
tony weads
The time is only relative to the light, in other words to the light from the stars that the planet(s) orbit around :)
I didn't understand ANYTHING
i can't like this video, there is no like button
It's... adventure time?
Or, perhaps, It’s Hammer Time…
excellent videos, nicely made and very very detailed, tyvm:D and you look like hank from breaking bad :P
I think we can't know what time it is until we know what reality is, it could be that time itself doesn't exist but is a product of us jumping from one moment to the next, or from one reality to the next, each moment itself takes no time. Or it could be that c is infinite and we're moving 300,000 kph slower than infinite which makes it seem as if time is passing, time stops at c which is why an object can be here, there and everywhere and in between at the same time.... Philosophy, reality, where is the line between the two? Was there ever a line to begin with? I understand why it takes a certain amount of insanity to be a physicist.... Thanks Fraser, you broke my brain again.....
Buuut is the speed of light always the same? I mean it should be different depending on the medium it's traveling through, air, water of vacuum. Right?
Yes, light's speed is different depending on the material it's traveling through. Light travels only about 40% of its normal speed when traveling through a diamond for example.
Ka-o-nabo P I do not think the light (photons) are going slower, but the fact that the photons traveling through different mediums get absorbed, emitted, reabsorbed, re-emitted, and so on by the atoms within a medium. Those absorptions/emmisions introduce delays while the photons (when it is travelling between atoms) are still going the speed of light.
Voidsworn good clarification
Ka-o-nabo P Sure :) I am not so sure this applies to photons travelling through mediums consisting of exotic matter states, such as Bose-Einstein condensates or fermionic condensates.
Misconception. Light is measured to be slower through another medium, for example through water. But only because it actually has to travel further; its absolute speed is always the speed of light as measured in a vacuum... or as close to a vacuum as is possible.
Due to entanglement information on a quantum level travels much faster than time. A particles state on the other side of the universe can instantly affect a particle billions of light years in distance apart. Relative relationships are all over the universe or shall we now say multiverse. For example no matter where you are relative to the universe you are the center of it.
So..When light travels with no time, it reaches an atom nearest to it in the same time it reaches the furthest atom in the universe. which means for a photon, there is no distance across the universe?
This would assume something could be distorted by light here and there at the same time?
no one ask me to explain relativity, people I know probably think I do not understand and they are right, this I do not understand
If Einstein was the first person to describe relativity how is it we can trace our ancestry? They are all relatives too.
Time is your own personal journey through space relative to everything else in the universe.
Can gravity travel faster than light? Seeing as light cant escape a black hole
wow you just blew my mind.
I like that idea that time itself can by off by up to 30,000 years depending on time dilation.
Well.... maybe he will, in time.
Well that was slightly mind bending. Loved it.
Great, I'm always happy to bend minds.
it's adventure time!!!
So, if I traveled faster than the speed of light could I look back over my shoulder and see myself? :-)
Great video,
If only you could. There is something similar, though. Although it would kill you, perhaps you could see the back of your head if your eyes were at the level of the photon sphere of a black hole.
How about a video on how to precisely measure light's speed in a vacuum?
I would like to see the experiments performed on RUclips that were performed when the speed of light was first measured accurately. That would be interesting.
Nothing is faster than a speed of light? What about the summer?
Time moves faster when you're having fun. Does that mean that gravity is greater when you're having fun as well?
So when we build our space empire how will we have a universal date and time standard?
Maybe this is why Aliens are having such a hard time reaching us, they cannot agree on a single time standard and always fail to meet for diplomatic meetings and end up in internal warfare.
SnowToad
Will probably just be like world clocks here on Earth: 'Hong Kong', 'New York' and 'Paris'. Instead being: '.... (fill in planet name) @ ....(fill in star system) :)