My bank uses the same theory, but vice versa. When the money leaves my debit card, it goes really fast. When something is to be repaid, it takes much longer.

@MARCO-rq2ph

2 жыл бұрын

XD

@fancygamer5896

2 жыл бұрын

Underrated comment lol

@rosauradiaz9842

2 жыл бұрын

Oh, same here

@novusmundi9131

2 жыл бұрын

It is, for bank, a convenient model to embrace. You'd be a banker, you'd do the same ! Now , of course, you don't believe Einstein really had any clue what was the speed of light. The number just fell into his hat. Actually Morley and Michaelson were trying in 1887 to measure the speed of light. But the 'ether" screwed up everything. Einstein just took M&M experiment result and declared that "ether" does not exist, and that froze everything in place including the speed of light.

@jedpeltier3320

2 жыл бұрын

LOL my bank is involved in this inverse of equities and is complicit as far as I'm concerned....I speak into existence and impose the maximum penalty for their impetulance with the application of the converse of consequence to the algorithms restricting my transactions and unleash the acholaids of irreverence to expand and proliferate the funds available to be unlimited everyday and to exponentially grow... please and thank you :)

Light: "My speed is immeasurable, and my time is ruined"

@brankelly1921

2 жыл бұрын

That's..... actually quite brilliant 😐

@sinpi314

2 жыл бұрын

Underrated comment!

@realo3503

2 жыл бұрын

@@sinpi314 yes it is

@pardeepgarg2640

2 жыл бұрын

Lmao 🤣😂🤣 You made me laugh so much 😂😂😂

@justharshad2044

2 жыл бұрын

WOW

On another note, I enjoy your videos immensely! You explain things in a way that I can understand and I find myself spending more time watching your content. Your videos satisfy that itch to learn.

@melonneleh

Ай бұрын

me too

@TheTrueSlowCuber

Ай бұрын

Learning is fun as long as it's not forced...

@hawavideouploader

25 күн бұрын

He did PhD in physics on how to make physics more approachable to general public using media. So, he knows thing or two about presenting in a way that everyone can get along.

@couththememer

6 күн бұрын

@@hawavideouploader That's so sick

I really never looked at that this way and you're right its facinating. Keep creating videos like this

This was a very fun present to unwrap. When you called me and told me to turn the camera on I knew something weird was going to happen and you certainly delivered. As long as I’ve known you Derek you’ve been destroying assumptions. Thank you for this friendship. It’s certainly enjoyable from my perspective.

@daenite2480

3 жыл бұрын

Aaand subscribed

@dylancorkindale

3 жыл бұрын

First

@cjyt4115

3 жыл бұрын

13 seconds ago

@homunculus3646

3 жыл бұрын

hey Dustin!

@VellianoRosso

3 жыл бұрын

Use quantum entanglement

"so someone has measured the speed of light... or have they?" Hey, Vsauce... Michael here

@arjunsubrahmanian7535

2 жыл бұрын

Hahaha exactly!

@hiftylonghead892

2 жыл бұрын

You look like vsauce but mexican

@Jacobcr93

2 жыл бұрын

Lol

@illusions66

2 жыл бұрын

xD

@mangckyatmamon

2 жыл бұрын

VSalsa

Destin’s idea with the super long fiber spool could work. Run the experiment in several orientations and look for discrepancies. Rotate the spool 90 degrees, capsize it, etc.

I have been a long time subscriber of yours but now when life is making sense to me i landed upon your videos and god i have been binge watching your videos ....every topic you choose is so interesting and really strings my chord.......🎉 Thank you

"So someone has measured the speed of light...or have they?" Huge Vsauce moment right there

@VivekYadav-ds8oz

3 жыл бұрын

They both never really were the same after the "Is anything Random?" collab.

@controlequebrado4455

3 жыл бұрын

Or were they?

@MikeTaffet

3 жыл бұрын

*vibrophone intensifies*

@joesimamura223

3 жыл бұрын

what about quantum entangle ment to start the two clocks on both sides

@ViratKohli-jj3wj

3 жыл бұрын

@Windigo Jones that is why you watch flat earth videos lol

Should have wrote this in my physics exams, "It is neither a supposition, nor a hypothesis, but a stipulation that I can make of my own free will"

@gasun1274

2 жыл бұрын

i still believe that 1 is prime

@ghostoftheuchiha526

2 жыл бұрын

@@gasun1274 0 is odd

@lesserevil8136

2 жыл бұрын

Definitely would have gotten your word count up

@finmat95

2 жыл бұрын

0 is positive

@ShopperPlug

2 жыл бұрын

Lets be honest or make a bet... when the time comes, it will be proven that the speed of light is same for both directions, its pretty obvious. Right now "Veritasium" got the free hall pass for making wild assumptions since speed of light can't be measured with synced clocks.

feel like since light seems pretty consistent you could use light to trigger a clock to get rid of the latency. Certain audio cables have essentially an unused control line that detects interference and compares it to the signal with the desired "noise" and deletes anything they have in common. Which makes for a pretty clean signal

What about using quantum entanglement to measure the speed of light? Fire the light, it sets off the entangled particle, and when the light reaches the end, the entangled particle there would immediately send the info back to the first one.

@MagruderSpoots

9 сағат бұрын

No information is exchanged when entangled photons decohere.

Great video. Despite getting a physics degree and teaching physics for years, I never came across this or thought about it. I was treating the video mostly as a 'fun to think about' sort of video, but your point at the end is really intriguing.

@josephburchanowski4636

3 жыл бұрын

Even after watching the video, I have a few questions. What terrifies me the most about the questions, isn't that I think that they'll find a way to solve the one way speed of light; but the fact that if I am thinking about these questions, someone else likely has already, and there is a reason these questions don't answer it, and when I try thinking of the reasons, it makes the whole concept seem even more bizarre than it already is. For instance, we are trying to measure the speed of light in a vacuum. But we could also measure the speed of light in a medium; intuitively there should be a relation between them. But the intuition must be wrong right? Or at least unverifiable. Which means even with an instantaneous vacuum speed of light one way, and a 0.5c vacuum speed of light the other way, there is some very strong asymmetrical physics going on when light goes through a medium. Even if I have a medium that slows light down to a crawl, there has to be a reason it doesn't show the asymmetricity in the speed of light. There also has to be a problem with colliding objects at relativistic speeds, due to the vastly changed special relativity formula. Two objects with the same insane kinetic energy relative to their stationary mass, can be travelling at two vastly different speeds depending on which direction they are traveling. One could be moving near instantaneously, while the other can be moving just below half c. Intuitively there must be some way you could use this information to solve the problem; but the intuition must be wrong, otherwise it wouldn't be an open ended problem. Probably the reason things act so asymmetrically weird if the speed of light in a vacuum is asymmetric, is because that isn't "just the speed of light", it is the speed of causality. It means cause and effect acts different speeds in different directions; and there is no experiment you can do that can get past the limitations of cause and effect. All physics basically goes bonkers such that the asymmetrical speeds will always work out. ---------------------------------------------- Anyways, other than my mind breaking, I do agree that the end of the video is very intriguing. A solution to figuring out if the speed of causality is asymmetrical or not, could exist in a unifying theory. So the mind breaking isn't all for not. Or perhaps the concept turns out to be pointless. As what does it mean if the speed of causality is different in two different directions? What is differences in time and space even mean if causality is different in two directions, aren't time and space dependent on causality. Perhaps the entire paradox of asymmetric speed of light is dependent on our own ignorantly rigid view of space and time? And thus unifying theory will have nothing to do with answering our fallacy of a question? Ugh, my head. Anyways, I can always find solace in that Hexagons are the bestagons.

@amon7816

3 жыл бұрын

Hexagon = Bestagon

@andu2oo6

3 жыл бұрын

I made a separate comment, but no one replied so ...here it goes: "I honestly have no idea what I am talking about, but ... can you use quantum entanglement to measure the speed of light somehow? The entangled particles are "already synced", so "hit" the one "far away" with "something" that changes it's state and observe it/measure the time on the one "near" you... and do the same speed of light test from/in all "directions", then just compare the times to see if it's the same. Only objection I could find to this not working is that I have no idea what breaks entanglement, so stuff like lasers, photons, whatever ... might not break it. In rest, it seems like a good idea. Obviously I am wrong, or else it would of been tried by now, but I would really like an answer for this, if someone could educate me. Like I said I have no idea what I am talking about, so don't jump me. :)"

@thijsmas1359

3 жыл бұрын

Okay, I have a question is the solution of 10:00 in multiple ways correct to verify de one-way speed of light okay hear me out. 1. If you do this and film both the clocks you can see which one turned on the fastest. Or which one is further. Once again you need to time it perfectly by turning on the cameras at the same time. But this one could be possible 2. If you move the middle clock to the left or the right you would get another result out of it if the speed of the light is different if not you have done it. To this correct you nee to set the clock on both sides at 300 meters away from the middle I hope my English wasn’t that bad and that you understood my brain thoughts

@drozdovkonstantin

3 жыл бұрын

Think one more time: "are distances AB and BA the same or they are measured in terms of light traveling time?" and you will get your sanity back. You can easily simulate the entire special relativity universe defining your (name A) causal boundary as now. It looks like "c0 towards you is \inf", and "c1 away from you is c/2" and for every BA synchronization event all time travel distances pointing to you are just zero, and still (c0 dt0)^2 = dr^2 = (c1 dt1)^2 the metric invariant your coordinates must obey. This kind of "absolute" distance independent from your speed of light choice came from you actually postulated the object B being at the same location for AB and BA synchronization events but how can you define "the same point" within the experiment? Observer from Pluto will surely note your signals were sent and received at different points of space. And here comes the answer: how can you measure any kind of "directional" speed of light if you can not provide the same distances in different directions?

"We've invented an FTL drive but you can only turn left."

@ConceptHut

3 жыл бұрын

Lol

@ConceptHut

3 жыл бұрын

If you turn right you go backwards.

@WilliamAndrea

3 жыл бұрын

It's not an ambi-turner!

@showcase-me

3 жыл бұрын

Douglas Adams Likes this comment!!!

@corwinchristensen260

3 жыл бұрын

NASCAR is going to have to build bigger tracks...

Your videos are amazing, I don´t speak english but I'm learning as fast as I can cuz I don´t want to miss your videos in both english or spanish. Thanks Derek.

In cmb,we see almost same picture in all directions that mean the light speed is same in all directions. (If that is not true,we will see different picture in all directions because the time of different direction's photos will be different that means,we see stars in one direction and cmb in another direction)

@piotr.ziolo.

25 күн бұрын

That was my thought too. Weird that Veritasium did not address that.

When a physicist comes to an engineer with a question: "OH you're gonna do something weird arent ya?"

@creatorboii3012

3 жыл бұрын

+Science Revolution I see but the whole religion thing is better than science is defunct

@Heero5308

3 жыл бұрын

Thing this deep makes me question the existence of this very video. Really.

@BruceNitroxpro

3 жыл бұрын

@Science Revolution , You list SO many things which are not true here that I won't bother to point them out. You might as well be traveling instantaneously.

@joselucas9398

3 жыл бұрын

@Science Revolution If you write an article and prove that mathematically, you could actually become a reputed scientist. Go ahead and do that. That's the beauty of science, all scientist have that in their minds, a sentence that says: "we could be wrong, and we probably are". We have like 3 centuries of science and look around you, look what they've already done! 300 hundred years is nothing compared to the time that our species is in the planet and absolutely nothing compared to the age of Earth itself. Stop comparing Science to Religions, they have nothing to do with each other.

@sashishekhar8266

3 жыл бұрын

Guys don't reply to that revolution guy,he/she literally mass spams this exact paragraph on all science related channel nowadays along with bunch of his flat earther friends, Well he's/she's literally questioning the very science which is allowing him/her to watch this video on his/her device, it's like if Elon Musk's son starts saying neuralink is fake. I was watching a video where a psychiatrist explains why these kinda people exists who claim the earth that it's flat or all the theories are bs , it's like they want to feel special as if they possess a knowledge which is hidden from the general public,it's like the film 2012 where only few people knew about what will happen actually in the start ,these want to get a feeling like that forgetting the difference between real life and Christopher Nolan's fiction scriptures , however this is also a state of mental illness which must be treated and not like back in 1700s when if someone started seeing ghosts , people started excorism or drowned him/her in the water lol

Destin was probably having a perfectly fine, normal day and then the phone rings. Now he has a broken brain.

@jontisaurusrex9851

3 жыл бұрын

Have a rocket exactly half way between earth and Mars. The ship will send one message to earth and the other the Mars and then instantly back to earth. You would expect that the message that was sent to Mars first would take exactly three times as long to reach earth as the one sent straight there. If this does happen then the speed of light is the same in both directions.#big🧠

@Anton-cv2ti

3 жыл бұрын

@@jontisaurusrex9851 In order to measure that, the clocks on the ship and on earth would have to be perfectly synchronized. How are you going to do that?

@vigilantcosmicpenguin8721

3 жыл бұрын

And that makes it an even better day.

@crisbercutov7405

3 жыл бұрын

@@Anton-cv2ti Maybe one way would be to accurately calculate at what time exactly the ship would be in a specific place between mars and earth and when the ship knows it's in the correct spot, just set the time to the predetermined on earth time, then proceed with the experiment suggested above.

@ericherrmann8012

3 жыл бұрын

Rotate a tube or a some type of gear with slits on opposite sides and have a detector to see if light made it through. At a certain velocity of rotation light won't be able to traverse it. That speed and however large the slit is (the distance it would need to rotate to stop the light from making it through) gives you the time. Use that time and distance between the slits to get the speed of light

Love the video and the way you explain things making it easy to understand. Alright here is my idea, assuming our nomber for c is correct then given a long enough test area we could set up a test with a gate programed to close on a percice delay to be some distanc light travles over that delay. Could we then wait back at the start for the reflection and adjust the timed gate untill we know exactly what timing it takes for the light to be blocked? In my mind you could do this in any direction and since you are blocking it before it hits the mirror then your getting the one way messurment

@szychaqable

25 күн бұрын

For me it seems you replaced second clock with gate, but the problem with synchronizing them still occurs

My kids and I love your channel and I love the conversations induced afterwards. This video covers a topic that I’ve wondered about for quite some time. How can an object like the andromeda galaxy that is 200,000 light years across “appear” as a single object instead of a smear? Especially since it is also moving through space? These are the things my sons and I ponder. Thanks again for the great content!

My real takeaway is that two clocks, regardless of precision, will never be truly synchronized. This explains why I am frequently late.

@markm8188

3 жыл бұрын

@Steven Moore Since I am the moving observer, it's my timepiece that runs slower. Only when traffic is unusually light can these relativistic effects be mitigated. It's just physics.

@seanzhang3873

3 жыл бұрын

That’s what I told my boss for getting late at work, and I got fired...

@zxuiji

3 жыл бұрын

Would like but your count fits into 8 bits exactly, don't wanna be the one to change that :) *Edit* Damn someone changed it, oh well, added the like now it no longer fits into a perfect 0xFF

@icedefundthepol8770

3 жыл бұрын

@@markm8188 ...but are you...or are you the observed standing still...

@yeetmeat_

3 жыл бұрын

I think about that all the time, how two things can’t be happening at the same time, EXCEPT for two things touching each other.

4:06 - "Or have they?" I feel like this was a missed chance to put the vsauce theme on

@kagebushinmailru

3 жыл бұрын

Also noticed VSause referenceh

@physicsrox184

3 жыл бұрын

Here kzread.info/dash/bejne/loWrltlyh8q-k7Q.html

@JanSeewald

3 жыл бұрын

this is depressing here the right url kzread.info/dash/bejne/qql3sZlmdK-pkaQ.html

@DumKump

3 жыл бұрын

Moon Men by Jake Chudnow (Vsauce theme) - kzread.info/dash/bejne/hoJml8mhm8nNgaQ.html

@Necrodzentelmenel1

3 жыл бұрын

kzread.info/dash/bejne/i5ud27mAqa3JecY.html

@veritasium I love your videos! I have a comment on this one in particular. If the speed of light returning to us was immediate, we couldn't then explain the cosmic microwave background or the red/blue shifting from stars right? As you explained, we cannot measure the speed of light directly, but evidence shows that it may be the same in both directions. What do you think? Thank you again for your wonderful videos!

@neil6477

19 күн бұрын

He did really address this issue, albeit in an offhand way. He simply said, paraphrasing, 'Of course we can always apply Occam's razor' - which is what we do in so much of science. There is no 'evidence' as such. Our models have been created based on the convention that light moves at the same speed regardless of direction. If this convention is wrong, then our models will almost certainly be wrong, and, at the very least, how we view the Universe, its structure and evolution will need a major rethink. It isn't that our models support the convention, it is that the convention creates the models.

Check a paper published by Andrzej Dragan and Artur Ekert "Quantum principle of relativity". Reading it you can see that if you would have a observer who travels faster than light (in your case this would be the information carrier about the time on Mars if you consider return speed as nearly infinite) from his perspective reality would be much different than for observes that are traveling with the speed

I love how he called it right off the bat, “oh you’re talking relativity, you’re gonna something weird aren’t you?”

@RileyBanksWho

3 жыл бұрын

"You're gonna something weird" This sentence makes me confused and or scared.

@Chadwicktrumpet

3 жыл бұрын

So is the speed of shadow the same as the speed of light?

@bradbarker8527

3 жыл бұрын

Quay

@Kristian-ql8zw

3 жыл бұрын

@@Chadwicktrumpet No

@TheMelbournelad

3 жыл бұрын

@@Kristian-ql8zw but why is it not that speed. That is the question

“We don’t you reply quicker?” “Sorry babe I’m at Mars rn”

@majidaskari8306

3 жыл бұрын

That's the way to measure the one-way speed of light. Send babe to Mars.

@energyzap9484

3 жыл бұрын

@@majidaskari8306 it doesn't matter; no matter if light is same or different in all directions, it will take 20 mins.

Great video, really got me thinking

Can we use some ohter signal than light to reset the 2. clock? Use sound signal to clear the clocks and then send the laser light after a predefined timedelay eg. 1s, then measure the time it took light to travel between the clocks. We know the speed af sound, we know the delay, isn't the rest a simpel calculation.?

@utkarshthakare8488

Ай бұрын

We are trying to measure speed of light in vacuum. Sound doesn’t travel in vacuum.

@danbroe5966

Ай бұрын

Yes, but it is a vacuum inside a cylinder, and sound do travel in the material the cylinder is made of.

@LightningJackFlash

Ай бұрын

​@@danbroe5966 Even if so, the speed of light is actually the speed of information. The speed of sound is determined by the speed of light anyway. It doesn't matter what "other speed" you wish to use to synchronize clocks, because the speed of every wave is based and limited by the speed of light anyway.

"Stars look exactly as they are right this instant." Gave goosebumps.

@user-hc9qv9yb9m

3 жыл бұрын

kzread.info/dash/bejne/oIZ7pbyhZaSehJc.html

@ABHEEeeee

3 жыл бұрын

We saw past of star coz it take millions of year to reach star's light to earth

@calebmcnevin

3 жыл бұрын

@@ABHEEeeee Watch the video

@xx_1dreamstanlegend_xx422

3 жыл бұрын

@@ABHEEeeee how do you know? Are you saying you can prove the return trip isn't instantaneous?

@jontisaurusrex9851

3 жыл бұрын

Have a rocket exactly half way between earth and Mars. The ship will send one message to earth and the other the Mars and then instantly back to earth. You would expect that the message that was sent to Mars first would take exactly three times as long to reach earth as the one sent straight there. If this does happen then the speed of light is the same in both directions.#big🧠

I know for a fact that the speed of light depends on direction, because sometimes when I sit at a traffic light I can see the BMW driver behind me flashing before I see the light turning green.

@yogi30303

3 жыл бұрын

I don't think the difference can be felt/measured through humanly senses. That bmw guy is flashing before it turns green.

@glinchdk

3 жыл бұрын

@@yogi30303 that is the joke.

@yogi30303

3 жыл бұрын

@@glinchdk yeah I guess among all the serious comments I took this seriously too.

@Majesticbro

3 жыл бұрын

@@yogi30303 r/swooosh

@AcidArmy_

3 жыл бұрын

@@Majesticbro r/slamdunk

So in basic school we've learned, that light "moves" like waves, but reatcs like photons, as in atoms. Why don't we send a laser beam through a wheel which has many flaps and it spins fast like Fizeau's, but the light would be blocked when the top flap is on top dead center, and it would let light through while the next flap is coming up to top dead center (when the flaps are making a V shape instead of a horizontal line). Then, you put a phometer on the other side, and u check all 6 directions, and compare them. If the light doesn't go with the same speed in all directions, then when it's going "against" the flow, the photometer would measure less light.

@jordanraiber2102

26 күн бұрын

if the light is traveling slower then so is the time so the rate of the spin of the photometer would still line up to give the same amount of light through in all directions. Unfortunately the speed of light affects the speed of time so no setup like this could possibly solve the problem

That’s why going to work feels like a drag and coming home feels quick.

@tarunyelakanti4710

3 жыл бұрын

Lol

@hoangphatnguyen3271

3 жыл бұрын

Hahaha

@ShadoryKaine

3 жыл бұрын

I know this is a witty joke but there's a video about this kinda time where u feel vs time that is real in vsauce

@babylebron6119

3 жыл бұрын

The answer is easy, if u wanna measure the time delay in one direction, u send an impulse between this two clock's in each of this two directions and u will see if one starts later .... Quick maths

@averagejoe9040

3 жыл бұрын

@@babylebron6119 I'll take it you didnt watch the whole video when you wrote this. He explains that the problem is that it remains unknown if light travels the same speed in all directions.

This is the best explanation of "WHEN WILL THEN BE NOW?" I've ever seen.

@kimberlystratton7585

3 жыл бұрын

Isnt it the best 'lack of explanation' of 'WHEN WILL THEN BE NOW'? **i really like your point

@gavros9636

3 жыл бұрын

Soon.

@jordanammons4851

3 жыл бұрын

Get two clocks that are 100 meters away from each other. Start them at the same time. Shoot a light across from one clock to the other. When the light reaches the first clock it will stop. When the light reaches the second clock it will stop. You have 2 times and you subtract them to find one. And convert to the larger scale

@gavros9636

3 жыл бұрын

@@jordanammons4851 How do you start them at the same time?

@Yrvo12345

3 жыл бұрын

@@jordanammons4851 2:07

I just have one solution to this(a thought): c = displacement / time. You said we can not synchronize the time for far distant location(which you think distance is constant) referring wrt measuring speed of light. Now at that light speed what if i say we can never measure distance precisely at different time instants ( mind it we are working at light speed ). Time dilation says space ( length) changes time which is significant at light speed, so at that speed how we define distance is important. Similarly if time changes ( which is very fast at c) length should also change significantly, if time dilation follows reciprocity. So what if c=kd/kt=d/t,where k is just constant which just shows if time reduces, length reduces or vice versa. So at the end c remains fixed. Basically if direction changes your speed, so should the distance!!! Now the only question is how correct is c value, well know that depends on how correctly we have captured the time to distance proportional constant. So how correctly we have captured c will tell how correct we are at calculations which involves "c". Either if it's incorrect only the definition changes not the meaning. It's just like saying instead of 1-meter now my new reference is 0.80-meter. I might have 20% error in value but it's just my new reference now. As long as my all observations / calculations are at far lower values wrt to my new reference the delta error i generate is very small in new observation. The same is the case with c, more close my observation reach to c, more error i would encounter. New thought: in your earth/mars spatial diagram you said c= infinity = distance/Zero ( as per your case), it also hold true for my explanation above which says c=0/0, distance is zero here which still makes c infinite!!!

we can use two clock but their distance from each other will be only 1 meter, put both clock in running position at 0.5m and then gradually move towards opposite ends this way both clocks will remain perfectly synchronized and also they will reach at our desird points. after that, we can through the beam of light from 1 end where 1 clock is present, and running to the other where 2nd clock is perfectly synchronised. this way we can calculate speed of light.

I swear this channel is a gold mine for educational and entertaining content

@AquarialTV

3 жыл бұрын

Indeed

@Frilabird

3 жыл бұрын

True

@justsomeguywithoutamustach8695

3 жыл бұрын

Very much so

@autoclockk

3 жыл бұрын

Why are you watching this on the same day I am

@AquarialTV

3 жыл бұрын

@@autoclockk the comment man works in mysterious ways

thanks for giving me another thought I can't talk to most people about cause they'll just say I'm crazy.

@kilmersklassiskakanal

2 жыл бұрын

yeah xD also with the gravity video

@r3kpwner303

2 жыл бұрын

They probably don't even have the intelligence to understand what you are telling them so it's easier for their little brains to consider you crazy than to accept that they are stupid.

@logangentry2365

2 жыл бұрын

Toooo true

@firstnamelastname8790

2 жыл бұрын

This is just him wanting to think is so smart conjecturing that c is different one way than the other

@moochoopr9551

2 жыл бұрын

@@r3kpwner303 Not true. People have different things to focus. No one has the capability to be smart in every thing. Debunk this: There is no way to measure a people's intelligence.

What about a laser a mirror and a receptor the mirror reflects and as soon as it reflects its caught by the receptor? But also how would you activate both the timer and the receptor at the same time? Via the phone as soon as a noise is made person 1 or p1 will wait 1 second then will turn on the timer and p2 will also turn on the receptor so it wil befome vise versa

2 synchronized clocks starting at the same point. Move 1 of them in a direction towards the sun for 1km (or something with a more stable position in the space like a far galaxy/star). Wait ~12 hrs so earth rotates. (something close to 12hrs, calculating all the planetary rotations, just be sure now the same direction is inverted relative to the space, this is the hardest part since you may need to wait a lot to be sure its the same direction again when moving back) Then move it back to the initial position. (now it actually moves on the same direction that it moved at the first trip) Once they are together again check the difference between clocks. Divide it by 2 and now you know that direction's time dilation for 1km. Next time synchronize the clocks again and do all again but with a completely different target, so completely different direction. (another far star, preferably in the opposite direction) Measure the second difference of the clocks once they are back together. If they don't have the same difference with the first test, you proved that the direction matters. If not you are close to prove that direction doesn't matter. Just do it again with different directions to be sure. Good luck

I like the extra effort you put into the short acting parts to visualize the concepts.

@Raythe

3 жыл бұрын

Have a big clock display of a super accurate clock suspended on a roof or tower. Aim two cameras at this display. Let the clock run, its start time doesn.t matter. Have the first camera triggered instantly, the second camera triggered by a beam of light activated the same time as the first camera. Compare the photos to see yhe time difference. Depending on how powerful the camera, depends on how far away you could feasibly place the static clock and second camera

@higorss

3 жыл бұрын

@@Raythe But how both cameras will activate in the same time?

@ProblemFactory

3 жыл бұрын

@@Raythe but because the speed of light is different for different directions, two cameras will see differently delayed images so that the time difference you see in the images will be c.

4:07 *Vsauce music starts* and im anticipating a round head will pop from the bottom of the screen.

@TheProGam3rHD

3 жыл бұрын

Hey, just to let you know someone else in this comment section named Nihab Khan copied your exact comment word for word soon after you posted. Control + F to find the bastard. Go give him hell lmao.

@ethangutierrez359

3 жыл бұрын

I’m glad someone else thought this😂

@-MVP-

3 жыл бұрын

IKR

@princetyagii

3 жыл бұрын

Or is it,,😂😂

@ImNotSusOk

3 жыл бұрын

yeah my brain stopped working. I long for the days of before I saw this video

Puts an interesting spin on astronomy where we deem distances relate to time, as in the “early universe” due to time it would take light to travel.

Two entangled particles originating from a single source are sent to two different points. Then, the particle at the first reference point is observed, and the measurement information about this particle will affect the other particle, regardless of the speed of light. Thus, the change in the second particle triggers the clock in the second reference. Thus, two separate synchronous clocks are obtained and the one-way speed of light can be measured.

"So some one has measured speed of light" "Or have they??" *Vsause theme plays*

@alijayameilio

3 жыл бұрын

I kinda expect there's a theme song... But left disappointed

@MikeTaffet

3 жыл бұрын

*vibrophone intensifies*

@sharofs.6576

3 жыл бұрын

Is he even alive

@sharofs.6576

3 жыл бұрын

Vsauce must have run out of topics. Loved his channel.

@bestonyoutube

3 жыл бұрын

yes what a garbage clickbait channel this has become....

Us to aliens: "We measure a meter as the distance a light takes to travel in 1/299 792 458 seconds" Aliens: "Which way monkeys?"

@shivannapv4262

3 жыл бұрын

Lol

@shivannapv4262

3 жыл бұрын

But the aliens can't know what a monkey is and they probably won't be able to speak English (I know it is just a joke)

@omniyambot9876

3 жыл бұрын

@@shivannapv4262 nasa would like to hire you

@shivannapv4262

3 жыл бұрын

@@omniyambot9876 why (I still know its a joke)

@liansangkima1

3 жыл бұрын

@@shivannapv4262 because biden is gonna be the new president😄😄😄😄

I think we should take a straight (line) path and take 3 equidistant points A,B&C on the path and synchronize both the clocks at point B and then move both of the clocks to each's opposite directions at same relatively speed at points A & C

@hydrogencyanide4999

14 күн бұрын

He explains why that won't work at 10:45

@gauravzambare212

13 күн бұрын

@@hydrogencyanide4999 At that time I had only watched the first quarter of the video

As a lay person (i.e., as a retired guy fascinated by science in general and Veritasium in particular but with no formal education in physics), can we bring entanglement into this discussion? Can we imagine, in some future time, a scientific instrument based on entanglement that we could use in order to synchronize two clocks at two different locations, or that we could use to undertake some of the other experiments you described for learning more about the true nature of c? As I understand entanglement, it is instantaneous, i.e. faster than light. Perhaps my limited understanding of "spooky action at a distance" may be revealing a woeful lack of knowledge about entanglement and about physics in general, etc. On the other hand, perhaps my comment here will inspire some undergrad physics student who follows Veritasium to pursue the line of inquiry I've described above and end up becoming the Nobel laureate in Physics in, oh, let's say 2030. Remember folks: You heard it here first!

I love when Destin is presented with something he genuinely didn't know/understand before. His face lights up with extreme excitement and intrigue.

@boycy69

3 жыл бұрын

That moment led me to evaluate my whole existence on whether I could share something interesting enough to impress Destin that much.

"Speed of light is the universe's refresh rate." -Stephan Wolfram

@minerscale

3 жыл бұрын

Has that got to do with his physics project?

@a.yashwanth

3 жыл бұрын

speed = distance/time refresh rate = 1/time

@AP05_

3 жыл бұрын

YES LOL

@Jahooliix

3 жыл бұрын

I haven’t got to the end yet but can you use some kind of quantum entanglement trigger in the future.

@samusam5853

3 жыл бұрын

Are we living in a simulator?😢

in one of your examples light can travel at c/2 from Earth to Mars and infinite from M to E...if this were the case, shouldnt the reverse speed also be applicable from M to E and vice versa? Love this channel and your work...also huge fan of @smartereverday

Here's an idea how to measure the one way speed of light: Put a photosensitive material at the other end of the light's path. When the light touches the material, it will start a reaction (similar to developing a photo). That's one way. Now, I know that in order for us to notice that reaction we either need to observe it (which means light would have to bounce back for us to see it, which creates a return travel for light) or measure the time in which the photo reaction occurred (but here we arrive at the two clocks problem). BUT! What if we create a sort of a tube made of entirely photo sensitive material, that would be constantly monitored by ultra high speed cameras and we measure the "speed" of photo reaction progressing towards the end of the tube? I have a feeling that what I just described is based on a cartoon logic, but... I don't know. Maybe it will inspire someone :D

“No Officer. I was not speeding. You see, the speed of light different depending on the direction.” Officer: “lol. Here’s your ticket.”

@epicvillain8308

2 жыл бұрын

Actually this argument has held up in court. Google it, it’s pretty awesome.

@puskywastaken

2 жыл бұрын

@@epicvillain8308 I tried to but couldn't find it. Mind sharing?

@lilsabin

2 жыл бұрын

@@epicvillain8308 you are lying

@orlanino

2 жыл бұрын

@@lilsabin 🤣

@aaronh8943

2 жыл бұрын

@@epicvillain8308 No but the dopler effect has, even though it works in the driver's favor. Far as I know this argument does not work anymore because of that factor (I just drive a truck though 😅).

Lol when Destin realizes Derek is about to drag him into relativity

@kevinrasmussen1748

3 жыл бұрын

yeah, that was hilarious.

@WyattCayer

3 жыл бұрын

That got me good when he realized what was about to come up XD

For the clock being desynchronized by general relativity I think there could be a solution. What if you put the button that trigger the clock at equidistance between both clock? Like the chema below: | clock 1/laser| __________(button)__________ | clock 2 | Then they would be synced because not moved and there is no need for the imprecision of a mirror. If it hasn't been done before I assume there must be something wrong with my experiment but I just want to know if someone as an explanation to it.

How about we consider 3 objects placed at equal distance from each other like at vertices of equilateral triangle. Lets name the objects O1,O2 and O3 and assume the light's roundtrip time is 20 mins between any of the vertices. Scenario one, light speed is same in all direction. 00:00 - O1 sends message M1 recording time 00:00 to O2 00:10 - O2 receives the message(M1) and sends response(R1) to O1 recording time as 00:10 and also sends message(M2) to O3 simultaneously. 00:20 - O1 receives the Response(R1) and O3 receives message(M2). O3 sends response(R2) to O2 recording time 00:20 and sends message(M3) to O1 simultaneously. 00:30 - O1 receives message(M3) with timestamp of 00:20 Scenario two, light speed is different across oneway and another. (Lets consider C/2 oneway and instantaneous other way around) 00:00 - O1 sends message M1 recording time 00:00 to O2 00:20 - O2 receives the message(M1) with timestamp 00:00 and sends response(R1) to O1 recording time as 00:10 and also sends message(M2) to O3 simultaneously. O1 receives the Response(R1) with timestamp as 00:10 instantaneously. 00:40 - O3 receives message(M2) with timestamp as 00:10. O3 sends response(R2) to O2 recording time 00:20 and sends message(M3) to O1 simultaneously. 01:00 - O1 receives message(M3) with timestamp of 00:20 If we receive message from M3 within 1.5 times the rountrip time, the light travels with same speed in all directions and thus oneway speed would be C. If not, than it will prove other way around i.e light speed varies in different directions. Does this make sense?

He said "or have they?" I was kinda sad no vsauce music played

@donottrustanyonelol

3 жыл бұрын

yea

@mahirshyam4127

3 жыл бұрын

If the pulse to start the second clock us traveling at the speed of light(2:27), then why can't you just subtract the number of seconds the second clock has been running for from the first? I feel like this is a stupid question and I'm missing something...

@BillAnt

3 жыл бұрын

I know, right?! At 4:05 I thought I was watching a Vsauce video. lol

@HaydenTheEeeeeeeeevilEukaryote

3 жыл бұрын

@@mahirshyam4127 because if the speed of light is potentially different in both directions, then how could they know how much to subtract it by? The experiment would be trying to measure the speed of light, but you’d need to know the speed of light in order to know how much to subtract the second clock by. For example, imagine trying to solve for the length of the hypotenuse of a right triangle, but the only information you’re given is the length of the bottom leg. Asking why you can’t just subtract the speed of light from the clocks to get the answer would be kind of like saying “why not use the length of the bottom leg and *the length of the hypotenuse* to find the other leg? Then from there, just use this other leg to find *the length of the hypotenuse.”* Hopefully this example makes sense, I’m not the best at explaining things.

@kartikchaturvedi7146

3 жыл бұрын

yeahhhh

"Ok, let's synchronize our watches!" - 2070 Nobel Prize winner

@controlequebrado4455

3 жыл бұрын

SEND THE REINFORCEMENTS THIS GUY IS LOW ON LIKES

@controlequebrado4455

3 жыл бұрын

Also there were two nobel prizes awarded for breaking the assumption scientists had about the charge parity and time simmetries so this wouldn't be a first but would probably be one of the best

@tonylastname4752

3 жыл бұрын

You could just move both clocks at the same speed for half a mile then measure the exact time the light was turned on, and then the exact time it reached the destination and do the math

@tonylastname4752

3 жыл бұрын

i meant move them In opposite directions

@mollykins8h

3 жыл бұрын

I thought this said witches... Happy Halloween!

Wouldn't redshift and blueshift disprove the c/2 and ∞. I mean sure we can't know if it's the same in both directions but I guess we can know that it cannot be instantaneous. Or if it doesn't work this way please explain why.

I thought he was going to say, it comes back slower, and then he said returns instantaneous. Very thought provoking

Thank you for putting a camera on Destin when you had this conversation with him. I wanted to see his pondering/puzzled face so much! 😁😁😁

@justamanofculture12

3 жыл бұрын

We* wanted

17:01 "And we'll wonder, why we didn't c it before?" Amazing!

@chriskennedy2846

3 жыл бұрын

g, I'm not sure...

This reminds me of the Jason Lisle articles on AiG trying to rationalize the creation story. Big difference in Lisle's view from the one way is presuming a self-centric zero-tick perspective on the directionality of light.

Einstein's assertion in his paper does not suggest that the speed of light from A to B would differ from B to A; instead, it highlights that the way measurements are taken (and how simultaneity is considered) can affect perceived measurements in different frames. This nuanced understanding is crucial in applications of special relativity and in interpreting experimental results regarding the speed of light. The core principle remains that the speed of light in a vacuum is a universal constant (c) in any inertial frame, as consistently demonstrated by experimental physics.

Setup the mirror method for a round trip. Place a second clock at the mirror. Walk back and forth counting the seconds to confirm they're aligned. Why not use mechanical clocks to sync up digital clocks?

"Or have they?" **strong flashback of Vsauce*

@KingR787

3 жыл бұрын

Why didn't he queue the song?! haha

@WickedMuis

3 жыл бұрын

@@KingR787 He'd need a colab and permission to use the song =)

@Retotion

3 жыл бұрын

It's a shame Vsauce doesn't really do these types of videos anymore

@dianereid587

3 жыл бұрын

Us to aliens: "We measure a meter as the distance a light takes to travel in 1/299 792 458 seconds" Aliens: "Which way monkeys?"

@ishworshrestha3559

3 жыл бұрын

Ok

“So someone has measured the speed of light......or HAVE they?” *Vsauce intro starts

@phlosen7854

3 жыл бұрын

I heard that music start...

@foxtrotfelix9086

3 жыл бұрын

Im your 69th like

@Pacwerdna

3 жыл бұрын

Agreed - thought this felt like a Vsauce video the whole time.

@elig1976

3 жыл бұрын

It is easy - set 2 sensors that send pulse when light passes thru them to perpendicular single clock, so there is no need for synchronization. Path from each sensor to clock and path direction should be same, so delay betwedn pulses will express exzctly time that took light to travel from first sensor to second - that's it, you will measure one direction light speed. Can make a such measurment in several dirdctions just to verify that result is same

@elig1976

3 жыл бұрын

you don't need to know when exactly they send it - you just need to measure delay between 2 pulses. Since each sensor sends its pulse in same direction for same distance , so time of travel of each pulse to clock will be same and delay measured by clock will express exactly time that took light to travel from sensor to sensor

Ooo,ooo! Idea! Start with two clocks that are synchronized. Move them apart REALLY FAST so the timeline dilation is visible. Then move back together REALLY SLOWLY so time dilation is (almost) negligible if the speed of light is different in different directions the clocks won't be synchronized anymore no matter what time they show. If the clocks show the same time then reset them and measure the speed of light with almost any of the ideas in this video.

God I love your channel so much. Thank you for all the effort you make at putting them out, I've spent countless hours enjoying your content and the quality of it, you really seem to enjoy what you're doing and it feels so nice to watch topics I'm interested in presented by someone who really seems to share that interest. I really appreciate you.

"so someone has measured the speed of light? or have they " sounds like vsauce

@joseville

3 жыл бұрын

Veritasium, Derek here...

@Hermann493

3 жыл бұрын

*Vsauce music starts playing..*

@ricobrawlstars4880

3 жыл бұрын

**Camera zooms to michael**

@debo325

3 жыл бұрын

Rip vsauce

@mcknorth

3 жыл бұрын

@@debo325 is michael dead????

This video really changed the way I look at “simultaneously”

@vast5853

3 жыл бұрын

haven’t seen the video yet, but based off psychedelic experience i know exactly what you mean

@Cameron-nf3nq

3 жыл бұрын

@@vast5853 could you explain ?

@Psionyc

3 жыл бұрын

Simultaneity*

@faizfrez2729

3 жыл бұрын

Now when i do simultaneous equations, i do the calculation for one, and i instantly get the other one.

@chriskennedy2846

3 жыл бұрын

This is an awesome, very thought inducing video. A follow up video on what could be causing this potential asymmetry would be fascinating as well. However the centered clock synchronizer at 9:50 doesn't exactly equate to the GPS example he introduces next because in the first example, the A/B clocks agree (correctly) that they are stationary relative to the other. In GPS, the clocks are in relative motion. This creates a larger problem when trying to keep the satellite clocks running at the same "rate" as the ground clocks. They in fact have to run at the same ongoing rate for the system to function accurately but this (like it or not) is in contradiction with special relativity. I cover this in my twin paradox video.

Great video as always! I had one question which I could not wrap my mind around. What if we put two light sources inside an object pointing at each other and mark where both sources point at. Then we accelerate the object and measure the distance of deviation from the original point they were pointing at. Couldn’t we see if the deviation is different between the two oppositely directed light sources, and by extent measure the speed of light using the deviation? Thank you in advance to anyone who sees this and answers!

@Blimbus-Blombo

17 күн бұрын

As far as I can tell this should work.

@matthewe3813

Сағат бұрын

The problem then would be that you would have to fire both the sources at the same time, which would not be possible due to having 2 clocks be synchronized and separated as he stated in the video

Consider a long length of evacuated glass tubing. At one end is a light source. At the other a mirror. Along the length of the tube are light detectors capable of detecting the intensity of the beam as it travels down the tube. Light pulse 1 is sent with the expectation that it will return back at the source in time T. If a second pulse is fired with a delay of T/4, if the speed of the first pulse is precisely the same in both directions, the expectation would be that they would cross paths 1/2 way down the length of the tube. The event being picked up by the light detectors; registering a sudden peaking of the intensity at that position. If there were any asymmetry in the speed of the light in pulse 1, the detectors should register a shifted cross over point ?

A micro millisecond: The time between when you shut, and lock your car door, and realize you left your keys inside.

@davidpowers746

2 жыл бұрын

What if the realization happens before the door shuts, but too late to stop it?

@treeguyable

2 жыл бұрын

@@davidpowers746 We are talking reverse space time continuum. Way past my realm of comprehension.

@davidpowers746

2 жыл бұрын

@@treeguyable The physics isn't ripe yet.

@rapidrabbit7175

2 жыл бұрын

Or perhaps 15 years because she told you she was 18.

@WilliamSmithIV

2 жыл бұрын

The onosecond

The worst part about me watching this video, is that I understand everything he says, but at the same time, I understand nothing.

@abrahamsanchez7455

2 жыл бұрын

Dude is too smart

@wShadow1

2 жыл бұрын

@@abrahamsanchez7455 indeed

@nemeryel6482

2 жыл бұрын

Understand the words, but not the meaning, it's what happens

@seanpeters7284

2 жыл бұрын

He does speak English pretty well

@dharmeshvala9886

2 жыл бұрын

Same here...

I think the problem with measuring the 1 way speed of light is the fact that we are thinking about time and space being mutually exclusive when in fact they are the same exact thing

What about starting with two syncronized clocks next to each other, then move them a set distance away from eachother, moving them precisely at the same speed. Then, have a light sensor precisely in the middle of the two clocks. Each clock fires a laser at a set time. If the clocks remained in sync whilst being moved, both lasers would hit the light sensor at precisely the same time. Add additional light sensors in between the clocks and the central light sensor to ensure that these also detected the light at the same time as one another to ensure the "instaneous" movement of light in one direction did not occur.

The moment when Destin realized "Oh snap, Derek is going relativity• is Golden!

@R0TEK

3 жыл бұрын

Where does the quotation end?

@bullpuppy7455

3 жыл бұрын

I am experiencing 299,792,458 meters of life every second, and no one else gets to experience it from my perspective. I dunno about you, but I'd call that relatively beautiful:)

Mark the Astronaut sends a message. Me, on mission control: "Oh hi, Mark..."

@4.0.4

3 жыл бұрын

You're tearing me apart, expansion of the universe!

@thePronto

3 жыл бұрын

"Oh, hi Mark. What did you have for dinner last night? Potatoes!"

@canaldoxerxes

3 жыл бұрын

"So, how's your research life?"

@darioinfini

3 жыл бұрын

ha ha ha what a story Mark.

Would be curious if you could theoretically measure the speed of light using 3 things, since we know photons are the basis of light, the directional speed of the photon, the frequency of the photons energy and the effects of gravitational interactions showing light moves at different speeds based on how gravity warps not only matter but energy if we consider gravity has correlation to the magnetic fields of different objects, and if we consider gravity can warp time and space then we should assume that light is not constant it should be correlated to the specific circumstance in which that single beam of light is traveling

Hello, This is an interesting thought that i can't stop thinking about.. Lets imagine spacetime is moving faster in one direction like you suggested.. couldn't we test the speed in different directions.. would we be able to detect curvature of the light? I imagine it would corve more in one direction if spacetime was moving as in your example? And i then determine if we could detect the curvature it would then prove if spacetime is moving faster in any given direction?? Great video

4:04 "So someone have measured time... or have they?" You're making me feel like you're actually Vsauce's cousin

@37rainman

3 жыл бұрын

Anything to churn out another vid, my friend, just anything......

@michaelhoste_

3 жыл бұрын

..or is he?

@zerokmatrix

3 жыл бұрын

Hey Veritasium, Derek here

@michaelhoste_

3 жыл бұрын

@Alexis Degryse If the light from the nuke has reached us then it already happened an hour ago. (Not sure what you mean by an ‘hour behind’)

"why did you fail the test today?" "The earth is in the slower Lightspeed direction"

@_edmund

3 жыл бұрын

yup

@Specialeffecks

3 жыл бұрын

"From" the earth or "To" the earth - which is the slower lightspeed direction?

place the middle switch in the part of a right triangle, that is where the side fo the triangle, and the base of it meet. Then remove the hypotenuse, and send a signal out from the middle switch/clock. The signal should then be immediately sent back when a device at the end of the wire detects it. When the signal leaves the middle clock, it should start a timer. And when a signal is detected by the clock, it should switch off the timer. So if in one direction c is slower than the other, the clock should stop, and then start again a short amount of time after. The difference cannot be nulified, because the signals do not travel in opposite directions. It would be almost impossible to get two pieces of wire that are the excact same length, but in theory it would work. BTW, this will not tell us what the speed of light is. It will only verify/refute the theory that c is different in different directions. If it is different (meaning the clock both stops and starts), then we can't measure it yet. If it isn't, then we have the speed of light already. Just measure the two way speed of light the way you did with the mirror, and divide it by two.

It's easy to measure if light speed is different along different directions: just point your laser beam and mirror in different directions to see if the speed that you measure changes. This has been done my Michelson and Morley to disprove the idea that there is an "ether" that moves, through which light travels.

4:07 "or have they?" *Vsauce music intensifies*

@themostwanted774

3 жыл бұрын

Lmao

@NarutoShippuuden921

3 жыл бұрын

@@themostwanted774 was looking for this kind of comment, ty

I love that all these guys are friends and all they care about is figuring stuff out, learning and showing us.

@MarchelloMastrayani

2 жыл бұрын

They couldn’t care less about figuring stuff out. All of these stupid ideas are absolutely incorrect, and have been put to grave with actual experiments over 100 years ago All they care about is showing their sponsors how many people watch their anti scientific horseshit Go buy some kiwico and support the huckster

@MarchelloMastrayani

2 жыл бұрын

@Zach Comstock me and 11K other people who actually studied Physics The rest of you should go buy kiwico

@MusicNewb

2 жыл бұрын

@@MarchelloMastrayani I'm actually interested in reading the experiment. Do you have any reference to papers that I could follow through?

@MarchelloMastrayani

2 жыл бұрын

@@MusicNewb absolutely, there were two brilliant scientists who set out to measure the difference of the speed of light in different directions over 100 years ago. Their names were Michelson and Morley and if you search “Michelson-Morley experiment” you will find many articles because what they have measured was an important stepping stone in the history of Physics

@sonjaschellevis188

2 жыл бұрын

@@ENikolaev huh

Just a thought experiment but what if you had 2 pairs of entangled electrons pair a and pair b, and your emitter and detector somehow held 1 of each pair. 5 seconds before the emitter sends out the light it measures the electrons spin for pair a,l and starts a stopwatch and the decetor detects that the wave function of the electron it has has collapsed starts it's stopwatch then when the detector detects the light for the emitter it waits 5 seconds then measures the spin for its electron of pair b. The emitter then detects the breakdown of the wave function for pair b and stops it's stopwatch then you minus 10 seconds (the buffer time) and record the number

01:47 In line with the example alternatives provided in this video... What if you start with two detectors in the middle with synchronized atomic clocks (or whatever most accurate clock to-date), then separate them by moving one to the left 1/4 km and the other to the right 1/4 km (or any distance but must be the same for both), at the same time and speed, then compare the detectors timestamps? I feel like that was left out on purpose cause you guys are smart and that should've been one of the options IMHO... Wouldn't that result in a reliable timestamp on both sides since both detectors wouldv'e been moved equally and therefore any time dilation would be equal? I would even add a light source on both sides that trigger at the same time according to the clocks and end with two results that should be identical? Lastly, to validate, I would repeat the test many times, then bring both detectors back to the center, again moving them at the same speed to confirm they are still synchronized. Any flaw with my logic here? Also, keep in mind that the two-way mirror experiment uses LIGHT REFLECTION, NOT SIGNAL TRANSMISSION... The light doesn't disappear and reappear, it reflects off the mirror and actually travels back, you can easily test this by using a flashlight and a mirror with smoke in between so its easier to observe like car headlights through fog.

Old Derek: makes people on the street feel stupid Present Derek: make rocket scientists feel stupid

@thenawabkhanaal9263

3 жыл бұрын

True

@terryfuldsgaming7995

3 жыл бұрын

only by asking a dumb philosophical question that reality refutes on every level... This is why philosophy is garbage. Possabilities dont matter, reasonable probabilities do.

@mikemclaughlin1268

3 жыл бұрын

@@terryfuldsgaming7995 bro my mans said Einstein himself did the two way measurements and he has many points in this video based on relativity not philosophy

@davyboyo

3 жыл бұрын

Past derek and present derek is meaningless according to this video

@onemadscientist7305

3 жыл бұрын

@@terryfuldsgaming7995 Reasonable? Take a good, hard look at our current understanding of physics and come back when you're ready to call it reasonable. The very reason philosophy _is_ interesting is precisely because there are possibilities about reality that sound completely bonkers to us, and yet there's strictly nothing explicitely fordidding those possibilities... so what rational reason could you possibly have to dismiss them entirely? Symmetry? That sounds like a good argument, but there are plenty of situations in the real world where symmetries are broken. You could say that, on a purely a priori basis, more symmetrical options are more likely, but because it's a continuum between being completely symmetrical and being completely asymmetrical, without changing anything about causality, physics or your everyday experience (since if there was a difference you could measure it), the probability that the situation is _perfectly_ symmetrical would be zero. Even as a thought experiment, this entire thing is fascinating because it completely breaks our intuitions.

Found this on ​ @Brian Koberlein's blog: "Then in 2010 Jason Lisle revived the idea of anisotropic light. If light moving toward us travelled at infinite speed, and away from us at half the traditional speed of light, then it would allow the most distant light in the young universe to reach us while still agreeing with relativity. As crazy as that might sound, Lisle is right in claiming that such an effect would be indistinguishable from relativity, and this has made the work popular with young Earth supporters. However agreement with relativity isn’t enough. If light did actually reach us from distant galaxies instantly, we would expect galaxies at all distances (or more formally redshifts) to all look the same age. In fact, what we see is that more distant galaxies are younger than closer ones. If Lisle’s idea was correct, we wouldn’t see the magnification of distant galaxies due to cosmic expansion, nor fluctuations in a cosmic background, nor galaxy clustering in agreement with dark energy, nor a host of other observational results."

@joshandromidas

3 жыл бұрын

This is exactly what I was thinking. I'm curious if Derek has an explanation as to why we still observe distant galaxies the same way in every direction if lightspeed would vary based on direction?

@anywallsocket

3 жыл бұрын

The notion of instantaneous light speed breaks all of physics, unlike as is reported in this video. SR and maybe even GR would remain the same, but QM would explode instantaneously. You have to realize c is better understood as the rate of causality, not just the upper limit for relative object motion, let alone the ‘speed of light’. Much more likely then, if an asymmetry exists, it is a very subtle one, otherwise you’d run into CPT violations, and also have to extinguish the conservation of linear momentum - which itself predicates all other conservations.

@walkerroberts97

3 жыл бұрын

It's travelling one way to us though isn't it?

@ineonfox4787

3 жыл бұрын

@@joshandromidas The thing is, that if lightspeed fluctuates depending on which direction it travels, we'll still see different age of galaxies, because of the difference in speed, so it'll look the same as if lightspeed is constant.

@joeytje50

3 жыл бұрын

So wouldn't your comment then prove that there is no direction in which light moves instantaneously? Also, considering the uniformity of the cosmic microwave background, wouldn't that show that the speed of light is indeed isotropic? Any directionality of the speed of light would then show in the CMB, right?

This is similar to the problem I have regarding the speed of gravity effect: if gravity acts instantaneously there’s no issue but if it acts at c - or any speed - the effect on an orbit of another body surely must be at some angle other than the instantaneous direction between the bodies? Anyway, another thought provoking video from V - well done!

@chandans6707

3 күн бұрын

No gravity is constant in every where

To determine if time goes just as fast in all directions: you take two photon sources in space. You arrange some mirrors in such a way that every photon describes a triangle (immagine two halves of an equilateral triangle). The two triangles are mirroring each other; photon 1 describes the triangle to the left (the left half of the equilateral triangle) and photon 2, the triangle to the right (the right half of the equilateral triangle). Photon 1 travels a longer distance to the left than to the right and photon 2 travels a longer distance to the right than to the left. You shoot the lasers simultaneously and observe when they return. If they arrive at the same time, speed is the same left and right. If one is slower, the sense of the longer direction is slower. You can repeat the experiment in all directions if you want.

This was the most elaborate, philosophical, mind-boggling, brain bending, insightful, confusing way of saying: We Can’t.

Everyone gangsta until someone calculated the speed of shadow

@lozoft9

3 жыл бұрын

Heyyyy vSauce, Michael here

@giacomogroppi5768

3 жыл бұрын

Its istantaneous because it doesnt carry information (so it could go above c)

@ePuffer6

3 жыл бұрын

Hey Michael, vsauce here

@ozciva

3 жыл бұрын

@@giacomogroppi5768 No, the shadow is not instantaneous. The light that passed the object before the rest is blocked will still be visible until the last unblocked light reaches the surface of the observation.

@mitchellcarroll3831

3 жыл бұрын

@@ozciva but it’s still the same thing... how do you measure the speed of the shadow accurately?

The two clock have a timer set to start after any time you set and when the clocks start you send the light signal and when the light reaches the other clock the clock stops.

Use a clock and the same setup, but with another clock at the end point that syncs with a pulse from the first clock. Put the clock at the point of origin and send the signal and light to the end point and they will get there at the same time. Then move the clock some ways between them. Again run the experiment using a third clock, one at each end and one at some point in the middle and if there is a difference in the speed of light in one direction versus another the delay should at this point become noticable. By moving the one clock up and down the experimental line and syncing it to the other clock via light pulse the difference should become measurable.

"Oh you're going relativity aren't you, you're gonna do something weird" Physicists: "He knows"

@korneelverbeke9746

3 жыл бұрын

I think i cracked the code: A lazers shoots a beam of light in 2 opposit dirrections, on each side you have a thing that starts moving towards the lazer at a set speed for example(100m/h). if the speed of light is different in both dirrections 1 of the 2 things will reccieve the light earlier wich makes it start earlier wich result in one of the 2 things ariving faster than the other. It could be that im wrong if thats the case please tell me what i did wrong.

@Hahalol663

3 жыл бұрын

@@korneelverbeke9746 You would probably run into the same issue of different amounts of time dilation in each direction as he mentioned in the video, causing the two clocks to become desynchronized.

@AmanVats

3 жыл бұрын

@@Hahalol663 I think @Korneel is right because he is shooting two "beams". Time dilation can not affect light itself. Light does not have mass.

So someone has measured the speed of light. Or have they? **Vsauce Music intensifies*

@MatthewHughes811

3 жыл бұрын

What is light? This feather is light. Feathers are used by birds to fly. *Flips you the bird* But what about this bird? Why is this called "the bird"?

@themafsguy999

3 жыл бұрын

@@MatthewHughes811 accurate

@donaldalm2293

3 жыл бұрын

Hey guys Micheal here

@divyakant3534

3 жыл бұрын

Thief

@AzaliahE

3 жыл бұрын

@@MatthewHughes811 lol this is gold hahaha

Haven't finished the video yet, but could you set up the same mirror set up, but also set up a reciever at the mirror so you can compare the time it was recieved at the mirror and the time the reflection was recieved at the source? Edit: I now realize the two clocks wouldn't be synchronized and we're back where we stared. If the speed of electrons through wire is a constant then we could use a single computer between both end points that was responsible for both timers but I don't think that electricty moves at a constant speed.

Correct me if I'm wrong but if somehow we place 2 clocks a km apart from each other in a stopped condition (0 time reading) and then if we take two lasers exactly in the middle of the 1km, one facing the right side clock and the other towards the left and are able to fire both of them at an instant, after which if we check the readings of both the clocks we might be able to debunk or even prove that light travels faster in one side by looking at the difference of the time measured !!!