nobody cares

@@lemau8458 why are you like this

Y E P cos he’s lonely and has to resort to toxicity to gain attention since he can’t get it naturally

@@TheDrumstickEmpire true

I expanded too I had to take some acid though

man i wonder how something like this would feel...

@@GRAITOM it’s called death.

Same

After corona times, it will be miller time. Followed by Coors time.

@@GRAITOM Well, . . . if you concentrate, intently and without choice of self, upon being able to travel within your physical existence at the subatomic level, then maybe you just might be able to 'feel' an emotion. But, . . . you'd have to be able to concentrate first.

Thx

NO . Incorrect. Unlike Light which is itself a thing that's why passes through empty space as a particle it can where as sound is just a disturbance in a medium like air in siren case for ambulance. Example: it's the difference like between the impact/effect/force office standing man pushing something to that of him hitting it with speed. Sound is (mechanical) produced by physical forces in air to be simple but not light it is it's on particle with fixed speed.

@@jairussiriyalaofficial8922👍

If this was true then your practically saying the expansion of the universe started from some point and has and end point meaning the start point of the siren when you first hear it and the end as the ambulance gets further away the sound ends and can no longer hear it.....Scientifically they haven't yet proven when/where a start of something like the universe but only know it has to existed or we wouldn't be here...what's actually astounding me in saying that is there maybe be a end to our expanding universe for example a balloon when you blow it up it expands until eventually it pops not saying the universe is round just saying that's how expansion actually physically works .

@@jairussiriyalaofficial8922 I concur

That's what Thanos must have done to murder people. Disabling the electromagnetic force in certain places (intelligent creature's bodies) while simultaneously accelerating the expansion of space in those places.

My exact thoughts!!!!!

@@zyansheep Yeah, duh.

@@zyansheep space didn't expand there

Damn, I wanted to make the same joke, lol.

mind tho, these videos need hours or research, hours of editing, hours of planning, a lot of hours really. It’s impressive that he’s posting like every week

Its almost like a miracle

Im not less quality ... Quality over QUANTITY

Mee to

@Abhishek Thorat His name is Derek? Damn. Always thought his name was Veritasium.

U

Exactly👍👍

How far can a photon be stretched by space?

They are all spinning in their graves cause they were duped by a fallacious Myth. Had Saint Einstein known that objects accelerating in a common vector, the starts of their accelerations staggered by DELAY, exhibit observations of RED SHIFT made by observers amid the objects also accelerating at the same rate in the same common vector.... he would never have endorsed single-point expansion HALF theory ... Had Saint Einstein known this, he would not have made the erroneous ASSUMPTION that red shift observations on galaxies implies expansion of space. Sir Hubble REFUSED to endorse LeMaitre and Einstein's fallacy ... he KNEW their ASSUMPTION was flawed, Space can not be bent stretched warped or folded because everywhere you'd like to bend stretch warp or fold it to, there space already exists, and the bending stretching warping or folding would result in space ^2 where space from one locale is imagined to meet space from another ... and THAT is total INSANITY. your appreciation for the elaboration of falsehood is misplaced.

Don't worry guys, I love you guys too. I'm just not retarded... but believe whatever the hell you wanna believe in. This is kinda fun though not gonna lie. But I'd rather not just pretend my whole life to keep everyone else happy... I'm sure we're all mad at God but come on. It's not his fault if no one listens to him... Just live honestly and don't pretend like you're anything else. I've got geniune anxiety about people watching me overtime. It's weird and now that paranoia might be a reality... just please keep pretending like I'm not as embarrassing as everyone else... God dammit.

because salesforce!

what if the universe (being infinite in size) is not expanding and actually everything in it is shrinking, would we be able to tell the difference?

@@usuario2967 uhhh yeah i guess cause then the light from sun would take longer time to reach us and the time would continue to expand

Red was not the imposter

Blue sus, bcs i saw red kill... The expanding photon from my phonescreen explain how blue is suspicious

Hahaha

I don't get it

@@MarioAP At 11:21, you hear a little girl ask "why's it red?" when he turns the camera on.

Because blood rushed to it.

You may not be expanding, but your mind is

And the comment of the year goes to

10/10

best top comment i have ever seen lol

I'm sorry I don't speak red shifted.

Shock I identify as skinny, I’m trans-slender.

If you don’t have electromagnetic forces applying to you while you’re on earth you’re screwed too

😁😁😁

I would love to see a video on how it feels to go out that way

@@VvDiverDownvV Being de-moleculed? It would probably hurt after some point, depending on the rate of decay.

@@LambGoatSoup Well see I feel like everything at the same time would just float away sooo you wouldn't feel anything maybe? You'd just go instantly?

Go for it 👍🤟

Man, I feel the same way but the diffrence is my age is on the younger side. I wish I could learn this for the rest of my life!

@@justanerdguy3054 Then go study Physics!!

@@beetlesstrengthandpower1890He said "wish", not "going to", because that means working on it, rather than just passively consuming media and forgetting about it the next day.

that never happened...

@@EXTENDEDWARRANT your sarcasm is bad

@@EXTENDEDWARRANT IT LITERALLY SAYS "Joke time"

@@thefountainpendesk I know I’m just joshin

no one asked but... assuming green λ = 540 and red λ 700... v/c = Δλ / λ = 540 - 700 / 700 = -0.2286... v = -0.2286... x c = -68523990.4 m/s or 246686365.44 kph That's 22.9% the speed of light... and he could travel around the equator in just over 2 seconds

Mind me asking your future plans after the M.Sc.??

Same here. I have a master's in physics as well and have thought many times that Derek would have been great at physics. He asks good questions and has the patience and ability to think through them logically.

@@mrbonzzai Well, he has a PhD in physics education research

@Science Revolution no the stars we see (with our naked eyes) are within the Milky Way galaxy and thus at most 100 k L.Y. away. The rest of your incomprehensive rambling I let somebody else to comment.

@Science Revolution shut up you're a tree

BAHAHAHAHAHA HZBXBAHHSJEIRNTNJFIHTBTBEKFNBFBDJDHTBG I DONT KNOW WHY I FOUND THIS SO FUNNY

Woohoo I was hundredth like

Funny

Most people of my family lost weight this 7 months

What to say when someone tells you you're fat: No, I'm expanding with the Universe... lol

Upvote number 111. This comment is underrated.

The irony is appreciated.

First time?

@@blank2588 朋友是一个坚韧不拔的纪录片， 在香港这座城市的设置。 主演：钱德勒 索罗斯 傅博斯1 瑞秋 莫妮卡 和一些其他他妈的演员。

Me: Especially with this incredibly overused format.

_Relatable_

@@noidea9952 Highly

Lmao same

hahaaa

Me: Let's spend 4 hour preparing for something that obviously won't happen cause it "might" happen

That's how it is sometimes. I'll be sound asleep by the time this video ends. Then I'll watch it when I wake up lul.

Haha that's good

Relatable haha also wanted to sleep but watched this vid instead x3

You need sleep too. (A friendly reminder to go to sleep if you haven't yet)

How far can a photon be stretched by space?

@@reasonerenlightened2456 maybe microwave as we receive the electromagnetic radiation from CMB

​@@reasonerenlightened2456There is no limit. Maybe energy reaches 0

There is this Vsause video that shows what will happen when you move at light speed so that's like 1 out of 4

Then how can you have a valid opinion?

@@Sonex1542 when did i said he is right I said it's sound good to me not by theory Big difference bro

sometimes understanding... is about letting go and letting the force guide you 💁‍♀️

Don't worry, you are not alone

Don't try to understand it, feel it

Well, kinda like when you jump, you're not being pulled back down by the earth directly, per se, your mass is just interacting with the earth's mass and you're sliding down the curved spacetime back to rest xD the earth is just much more massive so you think you're being pulled back down, but really, both masses are pulling on each other! Just the earth has a lot more mass to pull with xD

@@FractalNinja Yeah I get it conceptually, but intuitively "You are always currently accelerating up" seems like it cannot be true. It's one of those weird facts that is just a mind bender. I love it!

GDI Bass I'm not sure how "up" could be the correct term considering there is no "direction" in space. The earth isn't pushing you "up", you are just along for the ride essentially.

Up is a relative term, so the absolute definition of it (especially when talking about an intuitive interpretation of a concept) isn't particularly relevant.

@@FractalNinja I think you should watch veritasium's video on gravity! He explains how gravity isn't actually a force there and when you're free-falling, the earth is basically crashing into you. Just like in this video, the free-falling oberserver was the same as the astronauts stationary in the universe looking at the rocket-ship - because they are essentially the same

A good team behind him

And prerecorded probably, definitely not complaining though :)

Scientists keep thinking and there are still things to discover

@@ajtan06 prerecorded?😂 To what? Xd

Sweet, sweet sponsorship income = more financial resources = more better content.

Lol true😂

@@adeshpoz1167 it's all cool. His production team does a good job.

@@GregoryTorchia Derek must have also purchased that tower at Harvard, along with some distant galaxies.

SpaceX: Our 50th reflight of a booster! Veritasium: Shows his rocket in many more videos

you are blind to TIME. some good questions; how long is it now or how long is it now? Is time continuous? What is the shortest time that can be measured? To help with the answers consider the Planck constant

UNTIL SCIENTIST DEFINE QUANTUM GRAVITY THE WILL CREATE DARK WHATEVER? GRAVITY IS THE PROBLEM THEY CAN'T SOLVE.

Really, my friend. I have been thinking about that same question for a while now.

What is happening is more space is being created. Now could this new space creation get to a point where it could eventually overcome all the forces holding things together? Maybe. The Big Rip theory suggests that the expansion could continue that far. But its too soon to say if that will happen. Dark energy grows over time? I think so but is it infinite or finite? If finite will the acceleration lessen and stop? Before the universe smears out into homegeniaty? I doubt I'll be around that long to find out. 😎😆

I did too and then I thought I found the answer in a Philip K. Dick story where a man time travels (sort of) and the people from like15,000 years ago are tiny since he would be more expanded. They think he is god and it turns out he gives them the 10 commandment or something. But now I'm mad because I told other people we expand since I thought it was true because of that story I feel so lied to or something

There's nothing expanding besides the "metric".

Surely the laws of nature must apply to everything. That must mean that we are proof of the truth. Yes, aliens do exist and no, the universe is not expanding.

:,D

Gud one

Underrated

Thats exactly what i thought!!! :D

so thats what thanos did

He's really done a good job of making sure he doesn't get pigeonholed into a specific type of video.

😂😂😂😂😂😂 i can relate to you

🤣 same here

i gave like for 1%

Well if that 27% is the Doppler effect then you understand 100% of the video

ew

bri'ish "person" detected

@@devans.5324 "person" lmao

Alert, the Queen is on the loose

its been six months you need to keep up and have more crisps

The Earth's gravitational field is negligible to the red-shifting. It is red, because the source moves away from the observer, and as a result of the Doppler effect, it decreases in frequency.

​@@carultch I also watched the video. I was inferring that she hadn't, and she wanted the answer to cosmological redshift (-There I clarified the comment). Please understand that this is a joke.

@Science Revolution This is a joke, is it not?

@Science Revolution I really, really hope this comment is satire

preachhh

@Science Revolution You know, there are answers to all those questions. But because you started your comment demeaning and insulting all other people and scientists, it tells me you are not really even interested about the answers and you are not willing to learn from them. Therefore I can't bother to explain those things to you. For everyone's sake, just leave the internet for a moment and read a book, or something.

@Science Revolution if u had asked the doubts without insulting the scientists then I would have happily cleared them

Lol

Or his life flashing before his eyes.

Einstein cheering

@@dakinnie We tend to view the past with rose colored glasses, this is known as temporal red-shift.

He'd be known as Lil splat

NetDoppler

Actually I also only knew that it was doppler everywhere.... Then at the beginning I'm like is the knowledge i process wrong? Then later I'm like no i was not 😂

*BANG!!!*

It all depends if you view life through a redshift or blueshift lens!

Same

maybe

Papa flammy

Fancy seein' you here oh great and wise giga brain MENSA member!

Papa flammy!!!

I have a question: Why would light wavelengths look redder (lower frequency) if time slows down the faster you go? In the rocket thought experiment, those in the rocket with their time slowed down, should perceive the light as a shorter wavelength.

Your first mistake is asking questions. Your second mistake is expecting a reply. There are millions of holes in the current cosmological dogma, and everytime a new hole is found, they plug in some mysterious new entity to plug the gap, and keep the funding coming.

It’s all b.s.

@OP I'm a complete noob and I'm gonna be very handwave-y for much of this but I'll try to give my understanding of things. Also note that this is all scientific theory - the thing that makes the scientists believe they are "true" is that they describe, explain, and predict reality as witnessed by us. As seen many times in the past, as soon as there is something we can't explain with our model, we look for a better one - none of this is known "for certain" (whatever that would mean). (1) Space would've been expanding faster than the speed of light only for pairs of points that are sufficiently distant from one another. The Earth and the Sun, for example, are also objects in the expanding space, but they aren't moving away from each other faster than the speed of light (clearly, we can see the light from the Sun). As for "going back in time", we can see a distant object that - some time after the Big Bang - would've been moving away from us quickly, but not at the speed of light, that's why the light still reached us. (2) The theoretical origin of the universe, or the "Big Bang" - just says that the space is, and has been, expanding. The natural extension of that when you go backwards in time is that it started from a single point (or "singularity"). And, essentially, the entire Universe was then contained in that point - it was just "smaller" relative to the speed of light. That's why it's said that it was both "all of space" and "a single point". And, in particular, we can see evidence that "a lot time ago" the universe was very hot and very dense. (3) There are two possible radius you can draw from yourself towards the "edge of space". One edge contains the furthest (and the oldest) stuff that we can see right now (Visible Universe). The other one, outer to the first one, contains the furthest and the oldest) stuff that we will EVER be able to see (Observable Universe, ). We will still be able to see it (maybe in a few billion years) because the light from it has been travelling towards us since the Big Bang, and it's been moving towards us faster than the Universe is expanding. Once these two "edges of space" meet (again, in a few billion years), we will be able to see that "stuff" as it was at the time of the Big Bang. And after that, assuming the Universe keeps expanding, it will disappear (behind the edge of the Visible Universe), and we won't be able to ever see it again. As to answer your actual question - the way we calculated "when" the Big Bang happened, as far as I'm aware, is observe/assume some pattern in how the Universe has been expanding, and calculate how long it would've taken some distant objects to "expand away" from the point where we currently are. (4) Yeah, this is correct, some points are moving away from each other above the speed of light due to the Universe expanding. But they weren't always. At the very beginning (for some time after the Big Bang), the entire Universe would've been observable. (5) The reason why we model the Observable Universe as "expanding outward" is because some of the stuff we can see is moving away from each other (again, as measured by the speed of light, which is fixed to be constant). So, at least "for the time being" it looks like stuff is moving away from each other. But it's entirely possible that this changes, or isn't the whole picture. And the different examples that you mentioned are I believe examples of "possible models of the expanding universe" which theorize that e.g. the Universe starts contracting at some point, eventually going back to a single point again (Big Crunch). This would also, as far as I understand, make the entire Universe (eventually) Observable. The reason why these theories are mostly discarded nowadays is that we can't see anything that we think would reverse the current (visible) expansion of the Universe. PS: I really liked Veritasium's recent video on "Einstein's Math" and the theory that our Universe is a White Hole (the "Big Bang" being the singularity).

The girl named universe: *reports bruh moment*

“Help! I need an adult”

@@cyto3338 never speak again

Why don't you take a seat right over here...

Excuse me! I don't get this Can anyone xplain?

He is one of the GOATS if not the GOAT. However, there is one more equation which describes as much of the universe, if not more and that is Schrodinger's equation.

Funny you say this in this video, cause Einstein was really against the idea of the unverse expanding for a long time before he was proven wrong.

zu wild

Runner-up. Newton is the true GOAT.

it wasn't just einstein, many scientists contributed and even corrected einstein

This is an excellent question. We often say there is no preferred reference frame of the universe, even though the CMB seems to provide an excellent counter-point to that. The CMB is the furthest "object" that we can see back in time, and we can measure its Doppler shift via a special relativistic effect called beaming. Since we are moving at 600 km/s through space relative to the CMB, we see portion moving towards us as being blueshifted and beamed to a higher brightness, while the portion moving away from us is redshifted and similarly is dimmer. Based on the amount of beaming we see, we are able to determine our relative motion (to within some uncertainty of a few 10s of km/s). Because of this, it is somewhat fair to say that the observable universe does have a preferred reference frame in terms of velocity, however the universe itself still does not, as we still cannot define the CMB's relative motion to objects outside of the observable universe. Additionally, this preferred reference frame would be different depending on where in the universe you are, as our preferred reference frame (the observed CMB) would be much different than what someone at the other end of the universe 15 Gpc away would see as their microwave background radiation. The initial state of the universe did not have a special frame where the net momentum was zero. The universe was expanding back then just as it is now (even more so during the period of inflation), and as a result no such reference frame could exist as far as I know.

Good point.

Well of course, it's not the fall that hurts you -- it's that sudden stop at the end!

you british , bro ?

@@Milesco Nerf gravity.

@@Milesco ehh doesn't that mean that you'll get hurt by stuff like bungee jumping lol

@@psc698 : No, it means you *_won't_* get hurt by bungee jumping! (Unless the cord breaks! 😁)

Also they got time for multiple thumbnails...

I believe in the big crunch theory of death of the universe :)

I suppose if the universe is actually set against a 4D surface and had some sort of weight pushing on it, i.e. it was sandwiched between two hyperplanes, that could cause it to expand. Seems farfetched tho

@@KrishnamKumawat its the most comforting even if its likely untrue.

The universe is expanding due to its observers because , the universe didnt create the observers, in fact observers created the universe a, the universe can only exist when thers something observing it so this proves all the scientifiq theories wrong like universe expansion , big bang and dark energy its about time u ppl realize how stoopid u've been or show me how the universe created the observers bet u cant explain me that 😂

@@HumulatorHow is being crushed between 4D planes comforting? Actually curious.

Lol

This comment is underrated

But the fall doesn't hurt just the landing.

Welcome to theoretical physics

😂

Humm nice Question. I don't would like to know too.

They got this angle by analysis of the observations of the moon-sun cycles.

Thanks. Great example, don’t know why I didn’t think of it like that. Really helps me imagine what’s happening. Omg.... just realised this also helps me understand spacetime better as well! & how different observers can experience time differently. Many thanks! 🤯

And if the car is all red, it's driving away real fast

@@alex0589 And if it's blue, it's coming to you

@Science Revolution 1. Yes it's a star we can see. No, it doesn't have strong enough gravity; it's not dense enough yet. 2. Scientists don't, duh. The most recent picture of a black hole has a massive black spot in the middle. There's a reason for that. The light that we see is from the accretion disk, where space is moving with the black hole and objects are crashing into each other. Some light escapes from there. Also, the mechanism is explained with general relativity. Evidently you don't know what a black hole is. Gravity doesn't "decelerate the light speed;" it curves spacetime. _Time_ is included. The event horizon actually makes it so the light's possible futures all end up within the black hole. We don't know exactly what happens after that, though. 3. The curvature of spacetime is brought about by a big enough mass. We talk about "gravity," but we actually mean curved spacetime. In some models of physics, such as Newtonian mechanics, gravity is a force pushing things down, and that works as a good enough approximation for most uses. If you really want to complain about science, complain about string theory or something.

@@alex0589 Now imagine you're in the car. No traffic light would show red to you from a certain speed.

I end up watching them multiple times to try to understand it 😂

It's all shadeballs? Always has been

El stupido

i love it, that was my favorite part of the video!

got me smiling

Tbh I wonder if he managed to do it in the first shot

I'm sure he is a great father. Would like him to be my older brother

It's a consequence of your expansion being coupled to the earth, and the Earth therefore being the mechanism of expansion. Expansion radially from the centre is ruled linearly by 'r', but expansion perpendicular to that is ruled by the surface area of the Earth, which is in a square relationship to 'r'. Hence we expand proportionately quicker in the pseduo-plane parallel to the surface of the Earth. (Disclaimer: this is a joke. Feel free to pretend to take it seriously and continue the joke, but the logic is deliberately utterly wrong.)

Spongebob giving Patrick heasld, wtf XD

@@nialltracey2599 Wow I've never thought of it like that 🧐🧐

I was looking for this comment

Kings Disease album of the year btw

Same ish, just explained very well with animations. Good stuff

I hope you're not cynical. This is completely new to me and not explained in any other video I've seen (please share video here if i'm wrong. Anyway, this is explained heme amazingly and anything I can from a physics video. Very professional stuff Derek!

Wym the video was well made and this my first time seeing red shift explained like this. Don’t be thinking you are the only subscriber this guy makes vids for. 🤣

I'm sure he made it just for you.

well , according to what I've read or heard, 1. gravity is not a "force" exactly, (Veritasium has a video on gravity you should check it out) 2. the word "gravity" usually ONLY refers to the gravitational field of the Earth 3. There's nowhere in the universe dark energy isn't dominant

but I agree with the last line u said, spacetime isn't expanding, universe might be.

Actually that's what I thought first, that the stars and galaxies were just moving away from each other. But then, a question arises: Moving into what? The reality is that space itself is expanding and by doing so places things farther and farther apart from each other. And not only that, because it is expanding everywhere it accelerates things in opposite directions. Veritasium explanation is that while this happens things themselves don't expand, they are just placed farther and farther apart from each other. If everything expanded we wouldn't notice any change, would we?

@@ricardojsgw My understanding was that they are moving into the newly created space that is formed every instant uniformly in all directions, for some unknown reasons

@@architanaik1420 In response to your comment: 1) You're correct. It's a "virtual" force of sorts 2) Yeah, you're correct about that too (I should've said "gravitational attraction") 3) If that were true, "small"-scale systems like our own solar neighborhood wouldn't exist right? The whole point is that dark energy is dominant at scales where gravitational attraction (caused by the curvature of space-time) is not (for example, it seems to be holding galaxies together). I'd love to stand corrected though

If something went around earth incredibly fast it would be flung out of orbit

Also what is your profile pic

@@enderman5423 Yeah, I guess that's true. Maybe something like a long orbiting structure with passenger on one end and a counterweight at the other, putting the rotation pivot at the centre. Then just spin that really fast. My pic is a wooden owl statue.

@@z3dar According to Einstein, there’s no such thing as static. Everything is moving relative to something else

Beware. Easy answers to hard questions are almost invariably wrong. There is misinformation in this video, and others of his. But most of the viewers can't tell the difference, they seem to uncritically assume that he's correct.

You shouldn't have turned off electromagnetic forces

Soooo thanos basically used the stones to turn of people’s EM forces and then sped them up so that they could dissolve in thin air?👀

Yes I found the comment.

They should appear to move more quickly, I don't think this violates relativity. I think this is the same as when you hypothetically orbit around the Earth at ludicrous speeds and come back a year later -- only to find that the year on Earth is far far in the future while you have aged only one year

Great now I have another huge question to think about for years!! Haha really though, cool thought!!

What do you mean by saying that it will break relativity ? The light would still move at the same speed, its just that you would be moving into it, which means that your eyes will receive more of it.

I wouldn’t say it violates relativity. The light coming towards you doesn’t move any faster, but you see more of it. They’d appear brighter and faster.

This is like the opposite of that Einstein thought experiment where if you were to move away from a clock at an ever increasing speed, as you approached the speed of light the clock would appear to slow down and at the speed of light it would appear stop moving. www.emc2-explained.info/The-Light-Clock/

A few months ago James web space telescope just made a discovery that space is actually not expanding. Pretty crazy huh

@@shanecombs1993 NOT expanding?! Please give me more details...

@@r.i.p.volodya just search about it it’s a recent discovery there’s many videos on KZfaq

​​​@@r.i.p.volodyau do know that space is not a thing,space is nothing literally is nothing , saying that space is expanding like an object is one of the most retarded things u could say but this is coming from the same retarded ppl that believe in space expansion and big bang so i shouldnt be surprised😂

I feel like he's actually a Physics teacher that likes his job. :D

It's because he spells Derek with an "erek". They are the best types of Derek.

Tere se pucha kisi ne भो sadi के जो gyan चोद raha hain yahan

@@yoyomodiji Sorry, Google can't translate you. Maybe someone else can understand.

I just hope he doesn't burn himself out.

I read his comment that he has a team, cmiiw

That sponsor money getting put to use

This is the phrase I heard today

He made a community post where he said he has a team now.