The three most popular cosmologies: geocentric, heliocentric and egocentric.

@tpog1

2 жыл бұрын

Egocentrism is for beginners. You should try solipsism! Not only are you the center of the universe, you ARE the universe!

@Nomadmandude

2 жыл бұрын

@@tpog1 technically everyone truly is the center of their own universe.

@marquisdemoo1792

2 жыл бұрын

Thank you, the funniest comment of my day.

@stcredzero

2 жыл бұрын

It's surprising the % of time, that creationists turn out to actually be cryptic believers of egocentric cosmology.

@rubiks6

2 жыл бұрын

@@stcredzero - What's great is that, as a creationist, I understand that the Earth is the center of the universe and Dr. Don agrees with me. Seems like you're the one with the inflated ego.

"Everywhere Stretch" is probably the most apt way to explain the Big Bang.

@adventuresofanamateurastro804

2 жыл бұрын

Dose that mean we are stretching as well?

@timothy8426

2 жыл бұрын

The word tear comes to mind when you stretch?

@7heHorror

2 жыл бұрын

​@@adventuresofanamateurastro804 I think we're too deep in earth's gravity to be stretched by vacuum energy. But the current "Hubble expansion" is nothing compared to the theorized cosmic inflation of the big bang.

@istvansipos9940

2 жыл бұрын

"considering its significance, the Big Bang should have been called something much more interesting... The Incredibly Mega Epic Spacetime Ka-BOOM would have been way more fitting" - Calvin (not an exact quote)

Them: "So, where did the Big Bang happen?" Me: "YES."

Actually, the original axis for the center of the universe were centered on Don’s mustaches, but since he shaved, there are no more axis and therefore, no universe left to behold.

@carollafontaine7690

2 жыл бұрын

Yeah!!!

@METALSCAVENGER78

2 жыл бұрын

No, he didn't shave it, his mustache shrunk to a Planck volume.It lays dormant, until it decides to expand in an exponential fashion to googolplexianth light years in a matter of a Planck time, until it reaches Tethrathoth-turreted-pentacthulated-pentacthulhulhum light years before you say that number

@Harkhoost

2 жыл бұрын

Muuustaches ?. ;)

@Bildgesmythe

2 жыл бұрын

Hurts me more than the heat death of the universe!

@jeanyvesangers3885

2 жыл бұрын

Bonjour

This reminds me of the joke about the astrophysicist answering listeners call in questions on local radio station. Of course one of the questions was "Where is the center of the universe", and he calmly reaches for his phone and responds "Let me call my wife and ask her where she is".

@spock_elvis

2 жыл бұрын

Hahahahahahahahahahahahahahahahahahahahahahahahahahahahaha!

@bsadewitz

2 жыл бұрын

Ah, yes, the Woody Allen cosmological principle.

@gauravnegi4312

2 жыл бұрын

​@@spock_elvis lolololololollolololololollolololololollolololololollolololololol

@tedl7538

2 жыл бұрын

Hahahahaha......umm.....very misogynistic joke.

@zealandia5668

2 жыл бұрын

You are a good man.

We missed you! And you answered the one question I could never explain well to my friends. Tx!

We had really missed you Dr. Don!! Great video and welcome back!

This channel is my scientific refuge. I trust them to be honest, fair, and purely scientific. They don't abuse science for political or financial purposes.

@mysterymeat586

2 жыл бұрын

@Bhavesh sinha The same way as TV evangelists and politicians of course.

@jonb4020

2 жыл бұрын

In which case I'm sorry to say that you are extremely naive. They are as clueless as the rest of us about these big questions, and simply promote hypotheses as pseudo-science. They know very little.

@bsadewitz

2 жыл бұрын

@@jonb4020 They can rule out a slew of hypotheses which are inconsistent with the evidence. If it makes you feel better to say, in so many words, "see? No one knows any more than I do", have at it.

@jonb4020

2 жыл бұрын

@@bsadewitz Doesn't make me feel better, particularly. But I think it's always a good thing to call out fraud, or, more charitably, hubris or exaggeration, when one finds it.

@hanhai8515

2 жыл бұрын

this lab is literally sponsored by the us government lol

Dr Don, this was a fasciating video, like many others that you have done. You sure covered a lot of the universe in six and a half minutes! I hope you will be well and able to share your enthusiasum and knowlege for a long time.

This is my first comment and i would like to thank you Dr. Don for constantly blowing our minds:). Physics is my hoby and your vidoes help me get closer to understand what is the meaning of all this.

@DeconvertedMan

2 жыл бұрын

we do what we must, because we can.

@Shiva-ji6bh

2 жыл бұрын

By 5% we actually know about physics and the universe, you're really close to know nothing!!

@horizons2358

2 жыл бұрын

Why does there have to be a 'meaning' anyway ?

@Scratchfan321

2 жыл бұрын

@@DeconvertedMan for the good of all of us

@Shiva108

Жыл бұрын

The real "meaning" is to (choose to) be Happy, no matter what. Has nothing to do with physics. Those are just observations and concepts about reality that create the illusion of understanding.

I love this channel. I'm learning. Thank you so much Fermilab👍

You guys are one of the power cells that drive my study in my final semesters

The man is back

@mountfairweather

2 жыл бұрын

YOU'RE GODDAMN RIGHT!

@ivan-Croatian

2 жыл бұрын

FUKK YEAHH!!!!

@EvilCherry3

2 жыл бұрын

He's back but he's wrong. The expansion is accelerating. It means that some of the visible universe will become non-visible universe in a few billion years. It also means that very certainly all of the non-visible universe was as small as the visible universe at first, and not infinite. It is very dishonest to pretend that both universe sizes are proportional when all scientists tell us that the expansion is not happening at a constant speed.

@mountfairweather

2 жыл бұрын

@@EvilCherry3 can you make a video on the subject? 😊

@EvilCherry3

2 жыл бұрын

@@mountfairweather I can yes of course, but it won't be as good as the hundreds of professionnal videos on yt that explain this, so i won't.

A book I read probably 15 years ago that dealt with this subject was 'The View From The Center Of The Universe' by Joel Primack & Nancy Abrams. I recall that it was an enjoyable read with many unexpected insights. Maybe worth pulling out of my bookshelf.

@billtilghman2232

2 жыл бұрын

Perhaps a revised and expanded edition.

Glad to see you back Dr. Lincoln!!

"I'm gonna go get the papers, get the papers."

@fredtaylor9792

2 жыл бұрын

You're a funny guy!

What a fabulous teacher! My greatest thanks to all the educators out there - you're amazing!

1:41 the Earth is located at the Big Bang spot: Not true 5:26 any spot works Thanks for the explanation

Woohoo more Fermilab and more Doctor Don!

These videos are so explicative...in short we barely know a very tiny part of Universe and we are condemned to ignore all the other parts

WELCOME BACK, Dr. Don😀, missed your videos and your wit & quips. (ya know, if that guy Einstein had your sense of humor, he might have been taken more seriously. 😉) ps: Physics might be everything, but you make it fun😆.

@Bjowolf2

2 жыл бұрын

Einstein act. did have a great sense of humour 😉

Thanks always for another great episode. Where does time fit into this? I was given to understand that Space+Time was expanding. In your 2D representation, there was only space. Is there "negative time"?

@SubjectiveFunny

2 жыл бұрын

Time is just a measurement. It ticks by at intervals, which we decided are seconds, just like distance ticks by for everything in the universe compared to everything else, in centimeters for example. It's arbitrary information, and just like the centre of the universe discussed here, dependant on perspective.

@vigneshpreethamganji6956

2 жыл бұрын

Even I got to the same conclusion as if there was a 4th axis of time moving towards the negative direction. Maybe its just as the guy before me said, time should only be seen as a measurement and here negative doesn't mean going backwards in time similar to how negative distance doesn't mean no distance but rather another direction.

keep up the great work my Fermilab people!

Finally! I've been waiting for a video from you

I would realy like to see you more than once a month. Physics rules 😄

I prefer the balloon surface analogy -- it works for both expansion and "where" the big bang happened, and it's a practical thing that most people have some experience with. Imagine the entire universe is the surface of an expanding balloon. There is no "center" to the 2D topology of its surface -- though there is a center to the 3D topology that is defined/bound by the surface, it is "outside" of the universe itself. And, as the balloon expands, all points recede from each other at a speed proportional to distance. That's not to say that our universe is the 3D "surface" of a 4D "sphere" -- as with all analogies, it breaks down if you start focusing on the specific example instead of the general concept being demonstrated.

@ChrisStewart2

2 жыл бұрын

I would rather that analogy replaces by a good working model

@Ilirfier

2 жыл бұрын

I have a question since we know there is the 1D-2D-3D-4D has anybody seen it in 5-6-7-8D so we can say for sure that that explanation makes sense

@davidg5898

2 жыл бұрын

@@Ilirfier You only need one additional dimension to meet the requirement of having an expansion without an origin existing on the topology itself. Adding still higher dimensions doesn't change that. Contemplating higher dimensions only shifts the possibility of where in the hypervolume the origin might be, and even admits the possibility of multiple origins. The specifics of how many higher dimensions are necessary to explain our universe is a whole other kettle of fish. Some theories of physics go to 10, 11, or even 26 dimensions.

@heinpereboom5521

2 жыл бұрын

The same expansion rate is measured in all directions from the Earth's environment. The question is how accurate that is in the extremely small range of our instruments against the enormous dimensions of the universe.

Thank you for this video, Fermilab! It was everything to me.

Thank you Dr. Lincoln for saying 'backward' without using the letter 's' at the end. Obviously you are an educated man. 👍

Wonderful explanation, I actually understand almost all of it. Thank You!

As if the world wasn't already full of people who thought they are the center of the universe already.

My mom was really excited to hear this news. Thanks!

Surprising to me that wasn't hard to guess. Thanks for all the videos.

When you say you're the origin, don't forget that your neighbor is also an origin. An equation that represents the entire system, not just the observable, must have an origin of everywhere to represent an *infinite* system.

@Bjowolf2

2 жыл бұрын

No, he is an origin called Al - hence he is the original 😂

@deburkins

2 жыл бұрын

Just remember when saying that your neighbor is/was the center, that you and your neighbor are/were very, very, very close! 😄

So,... the earth *is* the center of the universe.

@v3le

2 жыл бұрын

except that there are infinitely many earth-like planets

Good to see you again, Dr Lincoln. 👍

always got this question on my mind, thx for answering :)

The biocentric big bag theory, I love it.💯% thank you for your perspective.

I enjoy your thought provoking videos. How can we see the CMB if the visible universe is so much smaller than the entire universe? Would the CMB then not be found outside of the visible limit and therefore invisible to our detectors?

@semloh1960

2 жыл бұрын

The CMB is light that has been traveling for 14.5 billion years. The Universe was not very big back then.

@mhonella

2 жыл бұрын

@@semloh1960 Thanks. That makes sense.

Great video Dr. Lincoln.

You look much more relaxed on camera now than in your earlier videos.

3:27 "Properly dealing with large, finite sizes just complicates the explanation, so infinite it is." Sounds like a cop-out to me. The universe is not infinite just because we can't be bothered to show our work. There's no shame in saying we don't know how big the universe really is. It may BE infinite after all, but we can't PROVE that yet. But if the very metric tensor that defines the size and geography of spacetime itself changes in scale - and has done so at speeds faster than the velocity of light during the inflationary epoch - then yes, ascertaining a "true" center of the universe would be a most difficult task indeed.

@drsatan7554

2 жыл бұрын

It is finite now but it's only getting bigger at a faster rate with no evidence to suggest it will ever slow down

@shayneoneill1506

2 жыл бұрын

Physics as practiced by physicists doesn't make that assumption. This is a video for non physicists, and he's trying to avoid getting bogged down in the math or it'd be a four year long tertiary course, not a 10 minute youtube video. Yes, the "real" explanation is expansion of the universe is the metric tensor in the manifold is getting larger, and things are thus flying apart. But try explaining that in a way that doesn't leave people even more confused when they started. "Well technically whats actually happening is things are getting further apart" is a statement that needs a *lot* of definitional work if people are going to understand your not talking in tautologies.

@tonywells6990

2 жыл бұрын

If we assume it is finite then that introduces more headaches. Where is the edge? Is there an edge? What topology (shape) does the universe have? Does it eventually curve back on itself in a donut shape? More complicated explanations do exist but nobody knows if any of them are correct.

@joebloggs396

2 жыл бұрын

@@tonywells6990 I don't see how there could be an edge for us. Everything exists only within space. The idea of a curved universe like a doughnut was suggested in a paper but isn't proven yet.

@tonywells6990

2 жыл бұрын

@@joebloggs396 Yes it is quite a conceptual problem.

I’m going to have a bowl of ice cream to celebrate my new found wisdom that I am the center of the universe. Thanks Don!

Another great mind expander. Thanks Dr Don.👍❤️👏😄

Dr. Don should have his own exclusive science channel

In short. Let's assume the universe is infinite, even though we know it isn't. Now we conclude there is no center of the universe because geometry doesn't work with infinite areas.

@Sopel997

2 жыл бұрын

yea... the whole conclusion follows from an assumption, making it useless. I'm sorry but this video is useless.

@xsimbyx

2 жыл бұрын

Who told you we know it isn't? We literally DON'T know whether it is or isn't.

@ax3king_

2 жыл бұрын

The alternative is the reason we can't detect bias in the rate of acceleration in different segments of the known universe is if we are in the center. What are the odds of that? How can we be the center of the universe? Why would we be in the center..... *prostrates to God*

@Ronaaronhunt

2 жыл бұрын

@@xsimbyx The universe has positive curvature, that means it isn't infinite. If it were infinite it would have zero curvature.

@Ilirfier

2 жыл бұрын

Ron Hunt you don’t know how dark energy and and other forces works assuming that something makes sense to you doesn’t mean it’s true and doesn’t mean that we have to except that as the only answer

My brain always hurts after one of these videos And that is as it should be

@pastblaster3285

2 жыл бұрын

You're expanding your knowledge ...... It's called " The Big Brain Bang " ..... It's going to hurt .......

@MisterSixty

2 жыл бұрын

Amen to THAT!

Great humoristic approach doctor!

Short, sweet, clear. Perfect.

Saying every spot in the Universe can be considered center of the Universe feels about as correct as saying every spot on Earth surface can be considered center of the Earth surface. It's kind of right but it's not really right.

@karla7765

2 жыл бұрын

Its meaningingless to consider a point on the surface of sphere to be center of sumthing...coz its a sphere... Ultimately center of sphere will be the ultimate center

“When I think back….” - Anyone else thinking the Professor was gonna bust out a Paul Simon tune? 🤣

@Alasdair-Morrison

2 жыл бұрын

Wonder if he wears diamonds on the soles of his shoes :)

"When I think back..." is a great way to start a video with this title.

If you drop a couple of dimensions, it's like a circle. Each point around the circle is the center and it can be infinitessimally small, and still you can travel for infinity around the circumference of the disc is describes.

What a great explainer, particularly the animations. This makes things very, very clear. Thank you!

Question for Dr Don: could expansion of the visible universe be explained by some sort of gravity effect from the non observable universe ? Rather than dark energy ? I.e space time isn’t expanding due to dark energy but all the observable matter is being pulled by gravitational forces which we can’t see ?

@LordMarcus

2 жыл бұрын

The problem with that idea is that even gravity must obey the universal speed limit. Those portions of the universe we can surmise exist but which were ejected so distant by inflation as to have never been visible under any circumstances means their gravitational influence on us is nil. Not only that, but if I'm recalling correctly, the cosmic horizon is shrinking because of continued inflation (dark energy), so that the faintest and most distant objects we see right now are no longer within our future light cone; they will continue to redshift into nothingness such that nothing that happens there "now" (such as a photon leaving a star and flying in our direction, or a graviton from a galaxy pulling us closer together) will ever arrive to influence our corner of the universe.

@brocksamson3282

2 жыл бұрын

another problem is things would accelerate outwards, the closer they got to the gravitation source. this wouldn't match what is observed. also, if the universe is infinite, there is no "outside".

@manuelt3856

2 жыл бұрын

@@brocksamson3282 bro, go watch the kardashians of something

I was looking for this from long time...

thanks for the great videos - I don't fully understand them all the way but I do find them very interesting and informative. I know a little about the concept of space time, not much but enough to wonder does the universe expand in space-time, not just space; 4 dimensions, not just 3? thanks again for the videos!

@narfwhals7843

2 жыл бұрын

The expansion we observe is only in space.

“Somewhere in me is a curiosity sensor. I want to know what's over the next hill. You know, people can live longer without food than without information. Without information, you'd go crazy.” i love this channel

The more I watch these types of videos, the more I don't believe in infinity.

Love it! You guys are a little bit more than smart!

I always knew I was the center of everything and everything evolves around me LOL. Thank you for sharing!!!

I thought the Big Bang happened between Adam and Eve

I always thought my mom was trying to build up my confidence, but it turns out she was spot on. I am the center of the universe.

I can’t wrap my mind around how everywhere can be the center of the universe.

Physics Hypeman. Thanks! Feeling better already.

pleaaaase keep making more videos!

I'm still trying to wrapy head around this. I have a question in addition to the info you provided. Would gravity influence the observation of age and distance in different "centers" of the universe. And would gravity influence the rate of expansion that we are currently observing?

Always a pleasure Doctor.

The intro is so dope

So...where in the freak did it happen? I feel lost in space

@Spugler2

Жыл бұрын

The big bang happened everywhere.

I always knew it but now explained by a physicist "I'm the centre of the universe" Thank you for this point of validation. 😅

Thanks for letting me know where I stand doctor Lincoln.

Something unrelated, but... your voice sounds amazing haha

Dr. Don! good to see you again!

I read a definition of the word "virtual" as "for all practical purposes" making our universe virtually infinite.

@brocksamson3282

2 жыл бұрын

yes

I wasn't able to make the last Fermillab onsite tour/presentation you held pre-covid as my flight got cancelled the night before the event date. Will you be holding any virtual events as I would love to see a live presentation even if it virtual still?

Epic opening and closing cards. Still... So why not consider extending them!

Love these videos

Finally back to the normal video format

Don’t matter how many ppl you invite only a small percentage of ppl can comprehend this stuff

THANK YOU PROFESSOR LINCOLN...!!!

love these videos 🙏

1. what was the initial entropy of the big bang? 2. if higher temperature means higher entropy and if entropy increases in time but the universe cools and was hotter in past then how come?

Fermilab. Has half a billion as a yearly budget. Still can't afford to give this man a good mic.

I have been wondering that too

Thank you for your knowledge it's wonderful.

Dr. Lincoln is back

And never ever say you didn't hear it here first....

Excellent explanation! Since I learnt how objects appear red shifted from earth I could never understand, if you looked at another part of the sky, why galaxy’s some weren’t blue shifted...this explains it 😀Thank you!

@heinpereboom5521

2 жыл бұрын

The accuracy of measuring speeds is more inaccurate if you can measure it in a very small part of an explosion. The universe is unimaginably large. You can then measure the same in all directions because this group of galaxies as a whole moves in a certain direction, but the difference in velocities from the explosion point between the galaxies closest to the explosion point and farthest from it cannot be measured. You could then measure the same expansion rate in all directions. There are also galaxies that move towards Earth despite the expansion, because the speed towards Earth is greater, simply because they are closer to Earth.

Thanks very much sir

My guess before watching the video is the answer would be "everywhere" since the universe is the expanding thing that we are talking about - I think.

@DeconvertedMan

2 жыл бұрын

after video, looks like I was right - "everywhere" is where the universe's expansion happened.

So, as I believed. No center. Everywhere is center. No bang. Just perspective. Neat

Very Comprehendible

Miss subatomic stories so much :(

He's back baby let's goooo

Well, I’m glad we cleared that up.

Thanks Don!

Appeal it intuition was correct again if the universe is packing into a small point and the the univsevers is expanding equally at all point the center is everywhere. The cool math question for me is if we could graph the universe into a circle knowing it’s diameter where is the center from that gauge. With no reference to the Big Bang.

Hi Don, if gravitational waves only distort spacetime by the width of a proton here on earth, how much was this distortion then at its epicenter like the collision of 2 black holes?

@solapowsj25

2 жыл бұрын

The gravitational wave (graviton perhaps) distorted atoms by a thousandths the width of a proton, so much greater energy in unit time, equivalent to maybe a few solar masses. Must have pulled the solar system closer to the center of the universe by a very small but significant distance.

@dannyb2816

2 жыл бұрын

@@solapowsj25 hi thanks what I meant was if you would be at the epicenter of the collision, would you then also see such a small shift of a fraction of the width of a proton?

I love the new intro

New student: It’s a very large number, so I’m just going to say it’s infinite. Any teacher in the world: No.