All the evidence we have for dark matter | A century's worth of science history
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- Опубликовано: 26 авг 2024
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Since 1884, the results have been piling up in favour of the existence of dark matter. In this video, I go through some of the most notable of those results and cover the history behind this great mystery of physics.
Here are the links to the scientific papers mentioned:
Kelvin (1884) - books.google.c...
Poincaré (1906) - articles.adsabs...
Lundmark (1930) - articles.adsabs...
Zqicky (1933) -articles.adsabs...
Babcock - 1939 - articles.adsabs...
Van de Hulst, Raimond & van Woerden - 1957 - articles.adsabs...
Ambartsumian (1958; conference presentation) - ui.adsabs.harv...
Burbidge & Burbidge (1959) - articles.adsabs...
Penzias (1961) - articles.adsabs...
Schmidt (1963) - www.nature.com...
Penzias & Wilson (1964) - articles.adsabs...
Rood (1965) - ui.adsabs.harv...
Meekins (1971) - www.nature.com...
Rubin & Ford (1970) - articles.adsabs...
Freeman (1970) - articles.adsabs...
Ostriker, Peebles, Yahil (1974) - articles.adsabs...
Einasto, Saar, Kaasik, Chernin (1974) - www.nature.com...
Walsh, Carswell, Weymann (1979) - www.nature.com...
Faber & Gallagher (1979) - articles.adsabs...
Milgrom (1983) - articles.adsabs...
Huchra et al. (1985) - articles.adsabs...
Soucail, Mellier, Fort & Picat (1987) - articles.adsabs...
Kovner (1987) - www.nature.com...
COBE team (1992) - articles.adsabs...
MACHO collaboration (1993) - arxiv.org/pdf/...
EROS collaboration (1993) - www.nature.com...
Super-Kamiokande (1998) - arxiv.org/pdf/...
MACHO collaboration (2000) - arxiv.org/pdf/...
EROS collaboration (2000) - arxiv.org/pdf/...
Clowe, Gonzalez, Markevitch (2004) - arxiv.org/pdf/...
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👩🏽💻 Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
drbecky.uk.com
rebeccasmethur...
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Me and my wife have a Joint bank account.. There is always less money than I expect in there. My wife calls it 'Dark spending' and says that it can not be investigated by normal accounting procedures.
Lmao
Hahahahaa 🤪😋🤘👍
That seems to violate the First Law of Financial Dynamics.
@@UltimateBargains That's because it's the first law of Marital Dynamics :-)
I think I know what you mean. Thankfully, I have no wife; Once I was proposed one, but it turned out the proposition entailed the spending of money in exchange for promises of great prosperity and prestigious achievement pitched with reassuring, plausibly sounding modeling which is never actually born out in reality. On a totally unrelated note, modern astrophysics is great, isn't it?
The history of modern astronomy is captivating. You've done a hell of a good job getting all of that together. Thanks Dr. Becky!
Dr Becky looks, and sounds like, a sex therapist.
@@boudicawasnotreallyallthat1020 The channel you want is "sexplanations," with Dr. Doe, not Dr. Becky's channel.
We do serious astrophysics here. Not to knock Lindsey Doe - she's good, too, at what she does. Just very different.
Fred
History of astrophysics is a bad joke
Well, don't thank Becky too soon :-). Dark matter is a misnomer. Scientists should have called it 'Dark Gravity' in stead since that's what it is: an not understood gravitational phenomenon. By calling it dark 'matter' it implies scientists would already know what it is: some form of missing matter. Unfortunately it is not. There is nothing mysterious about the extra gravitational component of mass, we just did not understand what gravity is until recent. A recent study was very clear; Gravity is the emergent longitudinal spacetime contraction effect caused by MOVEMENT of mass, both within restmass itself (subatomic particles spiraling around core of atoms) as of the macro object itself moving in spacetime. This longitudinal spacetime contraction is in effect what Einstein (Lorentz) already described as 'length contraction in special relativity'. Also the gravity produced by each atom is longitudinal in nature, yet due to the many unaligned atoms and 'electron' planes, it only appears radial to us. Einstein's GR thus is only the mathematical approximation of this collective radial ST contraction appearance. So the fast moving stars at the outer end or our galaxies have this extra orthogonal ST contraction (gravity) effect, holding on to each other effectively. This is the explanation. There is no dark matter, we just did not get what gravity was....problem solved....anything else Mrs Becky?
Would you say the same thing if the videos were made by some intelligent but ugly dude? 😄
This lady has an extraordinary gift of clarity. I have about 10 astronomy books and she blew them away with a 30 minute You Tube video!
On reading your comment my first thought was that wasn't anything like thirty minutes. And yet it was only a few seconds short, 30 mins flew by.
The PhD is why
Im super big on history, so seeing something like the histories of these discoveries organised into such a comprehensive video is so satisfying! Most people only hit the high notes when describing the history of discoveries. Thank you so much Dr.Becky!💜
You might enjoy The Discoverers by Boorstin.
I thought that whole Dark Matter issue had already been resolved by Douglas Adams who stated in one of the last HHG volumes that dark matter is merely the left over packaging material from when the universe got installed.
According to my personal experience, the observed ratio would be about correct.
Wouldn't that depend on how thorough Magrathea was about their packaging of new bespoke planets?
@@John.0z Yeah, but DNA never revealed that ratio.
10 times more package than product it must be delivered by amazon
Check for dark peanuts.
"...designed by Henry Ford...!" You can have a hole in any colour, so long as it's black!
lol!
TBF, Tim, she never said "Henry..." (14:22) But otherwise your comment fits quite nicely. :)
LE: oops, never mind... i hadn't gotten to 28:55 yet. :">
So much work went into this video it's actually insane. This is worth so much, and available for free, thanks a lot Dr. Becky! (I know I'm three years late on this, but there's no better time to learn than the present)
Beautifully clear, succinct and relatable history and narrative! Thank you for an amazing job and for sharing!!
Thanks Lloyd 🤗
Anyone that has done presentation, especially some kind of public presentation, will be in total awe of your approach and clarity. I agree fully with Lloyd.
This channel is growing by your passion. You had multiple appearances on TV and now even some awards.
Glad you keep the Science up.
I just love that a scientist straight up quotes a movie about christmas
Scientists don't pop into the world fully-formed. In their larval state, they begin as simple nerds.
@@rylian21 Or "not so simple" nerds.
I think I was deemed a "simple" nerd when I emerged from my larval state, but I am NOTHING like the good Doctor! So my nerdishness was, perhaps, just simplistic?
I don't believe in Santa ,so where do all the gifts come from
@@liammcguinness5465 china
It's all good. Inspiration can come from all sources, both real and fantastical.
I love these "How do we know..." videos that give us an historical overview of a specific question in physics. Thanks for making them.
Couldn’t agree more. Some things I just took as fact without giving due appreciation to the efforts of so many to get to what we know today.
Woah! You explain this very complex topic so well! I have a few assignment questions on dark matter and this not only helped me answer them but it helped grow my interest in dark matter.
"Do you mind? I am trying to prove Dark Matter."
Thank you
@@RampagingCoder watch david lapoint the primer field series ruclips.net/video/theV5b6R-Ng/видео.html
he is at odds with some of EU theory, but still compelling stuff , showing dark matter isnt needed for explaining galactic formation
A dna photo shows entanglement, it shows we might not need it.
Love your vids and this is by far the best.
Please do more like this, with the historical trail (and blind alleys) that leads to the point where we are today. It really helps to understand why the currently held best theories are what they are. It also gives a good feel for how likely it is that the theory is in deed correct, great for people (like me) with minimal specialist knowledge.
The problem is, there is no theory on dark matter. Somehow Becky forgot to mention that we do NOT know and all we have are mere hypotheses. We know that there is more gravity than we can account for. By itself, this means absolutely nothing. Either there is some form of spooky invisible matter that somehow manages to be only "out there" which is a bit weird or it´s only our understanding that is flawed, which would be way less weird.
Let´s just remember Ptolemy who had a perfect working model of the solar system with earth at its center, with formulae and everything you need to be called a theory. His model was the accepted truth for over a millennium and it was completely wrong. Given that fact and the fact that all we "know" about the universe are at best good guesses, it´s more than just a little bit arrogant to claim that an observation "has to be" something special just by ruling out some other explanations as if we had the full understanding about everything in the universe.
Amazingly well narrated, Dr. Smethurst! You make this piece of scientific history sound like a good crime story, and your enthusiasm is contagious.
I appreciate a lot that people like you with a profound understanding of the topic, take the time to share reliable information on science :)
Wow, I can't tell you how happy I am that I found your channel a few weeks ago.. Yours has been my absolute favorite channel to listen to while working and driving.. I love your enthusiasm and clear love for the subject matter and the ever present references to modern culture like Game of Thrones. I will absolutely be picking up your book. Dr. Becky, you complete me. :)
Dark matter is like raccoons. I don’t see them but I do see the overturned trash cans and garbage all over my yard every morning.
damn fine analogy
Maybe you’re a sleep walker
Giant, mutant *_SPACE RACCOONS!_* Oh Nooooo!! When does the B Ark come?
Excellent analogy. Better than the current one I use to explain it which involves trying to determine the source of a really smelly fart that nobody will admit to. :)
Yeah but how do you know that the trash cans don't just act differently at the distance from your house to the curb? (Modified Newtonian Trashcan Dynamics)
Dr.Becky You rock! I am so excited for your research, and appreciate your videos so much, I am so glad there is a resource that breaks this down in a manner I can really wrap my head around, thank you
Best take on Dark Matter I've ever seen or heard. Thank you for all the background, and your enthusiasm is contagious, thank you Dr Becky!
I love audio books. I will definitely be getting yours Dr Becky.
very good summary. I was not aware up to now, that Dark Matter had been in discussion or in assumption to exist that long.
What a nice surprise to mention Einasto and his group. We here are very proud of his accomplishments and he has made astronomy, astrophysics, cosmology a very popular subject in a whole society and has inspired a lot of people to choose this as their main subject. Thank you for a fair overview!
Thank you for this thorough walkthrough. You are truly one of the most astonishing accumulations of baryonic matter I have ever seen.
allready bought. you narated it? double the joy . i listen to your videos to get myself to sleep. ( insomnia is shitty) your voice is so calm. but positively energetic.
I use Matt Odowd from space time to put my 7 year old to sleep (bonus points if he retains anything).
I use ASMR to get to sleep. Perhaps one day I'll do an astrophysics ASMR 😂
@@DrBecky wow. thanks for replying. if the time comes , i will be there to get/buy it
Can't wait to listen to the book. It's great that you narrated it yourself!
I am super glad that I came across your channel. it's overwhelming to see the types of content that you make. Thanks a lot for all that time you spare to educate us with your knowledge and experience. Thanks for this channel once again.
so glad i decided to watch some of your older videos! I snort laughed when you said "It's AMAZING!"
Have you ever thought about doing a podcast?
I think setting up a patreon were supporters could ask silly questions (like a budget Brady) could be really fascinating.
Thankyou from New Zealand:)
Not a bad idea for a 50k sub special 😁
Keep your potty thoughts to yourself stupid.
@@johntaylor1102 what?
@@fuckyshityfuckshit You must be about 10 years old I would guess, does your mother and father know that you have such a low vocabulary?
@@johntaylor1102 No. They died in my early twenties. And I learnt my profanity riddled ways from the old testament.
Great video Dr Becky!
Now, a little bit aside of the science and the Universe, I would like to say, that I really like "the music" and "the flow" of your language, it sounds and feels really nice for my non native ear :D
Have a nice evening... ;)
You have explained the timeline quite clearly in a easy to understand manner.. Thank you!
I’m very impressed with your knowledge
Can’t wait til your book arrives
Have you attached a blooper section to your audiobook? ;P
Well that would be a USP, right there.
Condor Boss Next week’s video is essentially just that
Bloopers are like dark matter they are there but edited out.
@@DrBecky The error is in the formula used to calculate galactic mass. Galaxies are bound by a gravity matrix of exponentially variable density, meaning that every single particle in the galaxy is bound by the entirety of the rest of the galaxy. The gravitational density (therefore concentration of mass) increases exponentially nearer the centre. Density of galactic matter at its maximum at the core of collapsed atomic particles in what science calls a black hole (that much at least I'm sure you already know).
As an aside, what modern science doesn't account for in black holes is that the collapsed atomic material will only compress so far before it will compress no further - in effect sub atomic particles are non-compressible. Much of Hawking's work is based on erroneous assumptions as is that of most of the quantum physics crowd - phenomenal accumulative error! Dark Matter doesn't exist.
@@biomechanique6874 show me your peer reviewed proofs.
Personally, I think that DM exists, if I was going to say it wasn't I'd prefer (as the universe cares about what I prefer) that it's proof of a simulation. The coders that made the universe didn't put enough detail in the universe to make the math right.
"Say Jim, you know that galaxies make no sense, right""
"Sure thing Sal, but they look cool, right?"
"Yeah, they do actually, especially that cool lensing thing you have going."
"The rubes'll never figure it out."
The other reason we need Matter Obscure, is we need some kind of exotic matter to power our FTL drives!
Despite your efforts I bet there will be people in comments doing the "scientists just totally made up dark matter because they don't understand anything" routine, closely followed by the "despite having no background in any related subject and having made no real effort to understand the material particularly when there's any maths involved, I've decided I know better" shtick.
Math is a superset of reality, be careful, you can be brain washed by mathematicians.
@@davidschmale3359 What a great turn of phrase. Just to fulfil @yeme's prophecy... Personally I think given that GR breaks down at singularities, and the known universe is riddled with singularities, it is far more likely that the "next Einstein" will come along and do to GR what GR did to Newton, long before anyone ever detects a WIMP.
I just hope you are satisfied with what _you_ started.
Some of the most innovations come from people 'outside the bubble' of conventional wisdom.
I will never understand how anyone can take this much information and organize it in a way that it makes sense to anyone.
This is a great video, you are a great teacher, and I appreciate your efforts.
Oh, and I will be buying your book.
Can u make a 2-3 minute video of this while explanation ! I mean as a general viewer i would love to see someone explain everything in simple and shortest possible way , otherwise it’s so long and hard to focus and ünderstand
Love the pic of Dr Becky pre-kindergarden
Clearly she was full of enthusiasm about the universe even then.
French being my first language, I can say that "matière obscure" can be translated directly as "dark matter"
Really?? Sounds like it would translate to obscure/d matter
Everyone serious about the history of photography probably knows that obscura is Latin for dark.
_Introduction to the Camera Obscura - National Science and Media Museum blog_
blog.scienceandmediamuseum.org.uk/introduction-camera-obscura/
But her pronunciation isn't quite right, right?
As a French, she sounded more like trying to speak italian or latin then french.
But don't worry, Dr Becky, we forgive you. :D
I found her pronunciation of Jansky in another video quite funny too.
But that is kind of expected from a native English speaker, so it's OK ;-)
Congratulations on the audio book!! Awesome news! Love the channel 💛
Love your audiobooks and also the humour injected in. Praying you find your solar system gift of a primordial black hole soon! 👍
Would love to hear some bloopers of your recording your book ;)
Welllll then you’ll be very happy next week
@@DrBecky
I'm always happy when you release a video.
This one was great by the way, very comprehensive history of dark matter. One cannot avoid being in awe by the amount of thought and work put into these discoveries.
How do we know that we got the mass of the visible stars correct?
By far, one of the best video on dark matter, how it was discovered, lots of references, very detailed. Thanks a lot ! Congrats !
You are so interesting to listen, I am a fervent disciple of your knowledge and teaching ability.
"Brief" introduction to chapter four?!?! Damn Becks, don't give the whole book away! 🤩
There’s a lot more in the book - it takes a more meandering route 😂
Are we just going to ignore the name "Lord Kelvin" @2:29
I mean .. what a bloody cool name yeah?
*title
Just bought your book on Audible. Love your content.
You are truly the best. Carl Sagan and Michio Kaku, I have followed for years. You are now in the conversation. I love your book Space and the Speed of Light. LLAP 🖖
Doesn’t dark matter presuppose that we know exactly what gravity is, exactly how it works, and have an accurate model for its behavior. Since we don’t, isn’t the more reasonable (Occam’s razor) answer that we don’t have a theory of gravity that explains what we see? Or have we given up trying to understand gravity because it's too hard?
This was on astronomer Jan Teuber's office door at the Brorfelde Observatory:
Twinkle twinkle quasi-star
Greatest puzzle from afar
How unlike the other ones
Brighter than a billion suns
Twinkle twinkle quasi-star
How I wonder what you are
this is underrated
This is a fascinating video! Learning about the path scientists took to believing there is such a thing as dark matter is a great way of persuading doubting lay people of the likelihood there is such a thing.
Great video.. Again!
Also, I love the little Dr.Becky.. Soo adorable!
It should be called Ghost Matter - I vote we start calling it Ghost matter after(or on) October 31st
There are so many things in astronomy and well science in general that could have way better names. Ghost Matter would be far better but alas....
Constructed Identity - Good idea, for if there is, that is what it is. Lol
@@jmerlo4119 That assumes we can ever conclusively determine what it is. Unfortunately there is a real possibility that potential dark matter particles don't have any reaction with the weak or strong forces(which is what dark matter detection projects rely on the hope of) in that case gravity would be the only way to detect them assuming it is a particle. The particle model is currently the simplest possibility as it requires the least assumptions but yeah we may never know unless nature decides to throw us a bone so to speak. Whatever it is there does seem to be some indirect evidence from the Early universe that it both exists and can exchange heat through some means which if true maybe it isn't a hopeless endeavor after all but as always I'm skeptical.
You mentioned the "Red Rising Saga" by Pierce Brown at the beginning of this video. Are you familiar with "The Expanse" book series by James S.A. Corey (the pen name of co-authors Ty Frank and Daniel Abraham)? It's a series of nine novels (8 have already been released), and is a TV series now on Amazon Prime Video, It has been described as Game of Thrones meets Battlestar Galactica, though personally I think it's better than either of them. It is know for getting the science right - mostly. They do take a few (very few) liberties for dramatic effect (e.g., sound in space), but no warp droves, shields, artificial gravity, etc., and is set a couple of hundred years in the future when humans have colonized the solar system. The first three seasons are now available for streaming; season 4 comes out Dec. 13. Some folks feels it starts "slow" and takes 4 - 6 episodes to get "hooked." You night find it interesting, and each episodes is on about 45 minutes, since they were originally made for the SyFy channel.
So a thinking self replicating molecule that constructs warp gates isn't taking liberties?
Poppy Puppy nope, neither is "the slow zone" with changes to the laws of physics locally. It's still an awesome books series though 😊
@@poppypuppy5372 I did say they take a few.
One of your very best Becky. Well done!
you are so good. great way of explaining and keepin it so interesting.
and all that nerd that i still cant relevate with but so like. rock on
What about the huge amount of molecular hydrogen which was found in NGC 891? (Valentijn, 1999]
That was mine. Sorry. I'll clean it up
What about it?
22:38 Listener momentarily forgot about dark matter, became enthralled with suddenly new hairstyle and pink nail polish. Listener's mind wanders to his beautiful scientist wife who is, like Presenter, fond of nail polish. Listener decides that life is good and lady scientists are the best thing ever. Listener remembers dark matter and has to rewind video by 30 seconds.
RUclips video title never... "Dark Matter Found!!!"
I'm patiently waiting for the day!
@@DrBecky might not come.
@@DrBecky is not understanding english.
This is such a great show! So fascinating.
As Mr. Spock might have said upon watching this, "Fascinating." :-)
like then watch
As soon as Linux is supported by any major audiobook platform I will listen to your audiobook! Cheers!
This is such a fascinating video!
Very nice! Thoughts on DM being gravity leaked from multiverse?
Grats on book and look forward to much more
There is no multiverse. There is only the Universe. There would have to be nothingness between multiverses which is impossible, so any space between would be the universe that binds the multverse, and therefore would be a universe
Thanks Doc Keep encouraging people to question.
To paraphrase Mick Dundee: That's not questioning. ruclips.net/video/MvNCWMD6so4/видео.html - _That's_ questioning.
@@ole555 excellent link!
Thanks for the effort you put in to make Astronomy fascinating. Nuff respect. One Love!
Excellent piece. I appreciate the lucid explanation of what dark matter isn't. Thank you!
NOTIFICATION SQUAD ASSEMBLE!
What if dark matter is actually souls? I'm just kidding. These videos always have this comment.
@Just Looking lol. It was 1000% a joke because there are always idiots that say that in dark matter and dark energy video comments.
@Just Looking If something is in watts its per second as second is unit of time in SI system. A light bulb that has 100 watts power rating is using 100 watts per second. U re maybe thinking about price of electricity that is often shown as price per kwh (kilowatt hour) lets say 15 cents for kwh so u think it should be in hours but its in seconds.
Just because you haven't seen it doesn't mean it's just one thing and not a combination of things. Much like a constant in an equation, it is what makes the formula work thus it has to be correct even if it isn't. I love your channel. You are a wonderful enthusiastic presenter and my favorite Dr. of Physics by far.
Dr Becky you explain things in a way that makes it exciting to learn more about how the universe works....THANK YOU
We don't know Dark Matter exists! We do know there are gravity wells, or something that acts like gravity, that we cannot account for from what we otherwise see. Something is keeping galaxies from collapsing and produces gravitational lenses. The only thing we know that does that is sufficiently dense matter. That however does not really add up to "Dark Matter".....yet.
They cheat the Definition of Dark Matter includes any answer that does not have matter in it. Same with Dark Energy any answer even those without energy are still Dark Energy.
@@RedRocket4000 The definition of dark matter is matter that we cannot see or is dark. This includes all of the known standard model of particle physics as well as more exotic entities not known to exist but hypothesized such as micro black holes, weakly interacting particles, and matter that doesn't react with electromagnetic fields.
maybe it's a stable form of compressed/condensed space, or its from a remnant from a Universe before ours...
That's my theory too. The way I envision it is if you think of space time as a 2D fabric, but the fabric is not Isotropic, IE some parts of the universe have been "worn out" or "wrinkled up" and when this happens seemingly empty space can have gravity, or anti gravity, properties. Basically gravity is not the sole domain of Matter and Energy, but empty space can itself have inherent gravity.
@@freeman2399 Kinda the same as I envisioned it. And my other imagination based theory was with the example of when you make cake and you have leftover eggshells, the cake is done.. But the eggshells remain yet their are not needed anymore for the cake to continue existing, they were needed in the initial creation process.
May be lol. It's gravity effects from another anti universe. Like in the 'brane' theory, all the gravity/matter in our universe affects the universe on the other side of this brane. And vice versa. Like one universe 'pushing' into another. Just gravity with no matter.
I wondered If no new energy can be created where does all the new extra space is coming? If space is expanding then does one see it as ballooning or continuing to silently invisibly big banging here and there. Space is weird, so are my neighbours.
A very well explained video. Nice work. I'll keep my eyes open (ears open?) for your audiobook as the US release. As we learn more about the possibilities of interactions with other dimensions (through theories on virtual particles, etc), dark matter could be beyond the 3rd dimension, and thus, really tough to see? 🙈
I love that an audio book is actually read by the author. Finally everything is pronounced properly!
dark matter is the astronomy equivalent of cats, its pushing everything away!!
That's dark energy, dark matter attracts stuff gravitationally
There are cats in space?
Are you sure you're not thinking of "Dark Energy"?
sounds like my ex lol
Oh--dear--what can the matter be? Try plasma.
The known 5% of the universe is 99.9% plasma. We know it is not plasma.
@@ExistenceUniversity I suppose that you KNOW that dark matter exists as well?
@@kathyfausett9301 In the sense that I know I can measure the mass of a galaxy and discober that the plamsa and baryonic matter doesn't account for the whole mass that some "dark" weighted object (i.e., mass i.e., matter) must exist, regardless of in which measure it exists.
@@ExistenceUniversity Is that a YES or a NO?
@@kathyfausett9301 Dark matter doesn't emit light of any frequency, it doesn't absorb light of any frequency, the only evidence we have that it is even there is gravitational interactions. It can't be plasma, or any other type of baryonic matter. It is something else.
re: "Dark Matter" - Suppose inertia is relative.
F = m a = G M m / R^2 ==> a = F / m = G M / R^2
- Suppose it is not M that is relative to R but m (inertia).
The Dark Matter conjecture proposes that the anomalous (lack) of centripetal acceleration is due to M being bigger than expected. But it could also be that small-m (the object's relative inertia) is smaller than expected. So instead of modifying Newton's law, perhaps we should be modifying Mach's. This idea could also explain the effect we call "Dark Energy".
Hey, love the channel! Your accent is driving me mad, are you from Horwich? I grew up in Hoddlesden and it makes me smile to hear a familiar voice, every time. I just bought your audiobook, ty for reading it yourself!
Haha almost! I’m from Adlington!
Could just be haphazard coding of the simulation
Ah yes, cause we all know how wonky those silly little simulations were back in the 1880s...
@@arpeggioblue ruclips.net/video/tlTKTTt47WE/видео.html
Hibiscus oh, that simulation
Start off by finding it first. No matter how good your mathematical recipe, if the cake doesn't rise, it's wrong.
Of course, you can say the same thing about MOND variants.
IamGrimalkin well... All laws are man made, and after 300 years perhaps it's time to re-evaluate things that are taken for granted; seeing as physics is at a crisis.
@@Problembeing Yeah, of course.
All I'm saying is, MOND has had similar problems to evidence not turning up as the WIMP solution does.
One that seemed particularly prominent to me is that almost all relativistic versions of MOND predicted that gravitational waves would not be affected by Sharpio delay coming out of galaxies (unlike em radiation), but the LIGO results have shown that the light signal and GW signal come at the same time, so they most both have undergone Sharpio delay.
What would be helpful for more people to take MOND more seriously would be for MOND models to predict something that gets confirmed, rather than predicting something that gets found to be untrue.
Also, in general, MOND models now consistent with the evidence from e.g. the bullet cluster mentioned here still require some dark matter to work, just less of it (but the idea is, it lowers the amount of dark matter needed enough that it could be baryonic matter rather than something more exotic).
So the baryonic dark matter needed for the theory to work would still need finding, in the same way conventional dark matter theories need to find WIMP dark matter or whatever.
IamGrimalkin thank you for your reply.
I'm sorry - I just do not accept this ad hockey of adding whatever amounts of 'dark matter' required to make a model work. It's gone from 98% to 95% to 68% currently. All of these problems ensued when Einstein cut-off aether at the neck. It's been anathema ever since and I think we've been paying the price for it. The irony of creating this exotic matter is that it is acting precisely as a surrogate for aether in the first place and I predict one day it will be anathema as today's current mob treat aether. I do not see how one is considered so utterly incredulous whilst the other (seemingly far more ludicrous) is almost accepted as a given without absolutely ANY physical evidence. It's all pervasive to work but gradually less pervasive than we need it to be... Do you see how unconvincing that sounds?
Before going ad hoc looking for new particles; new physics; black this; dark that, surely - it is in our best interests to take another look at Einstein's peers that he and his acolytes dismissed into obscurity. The idea we may have 'missed something' before 'thought experiments' and mathemagics were interpolated over actual physics seems to be of the highest pertinence today than ever.
Physics is stagnant.
There are no new advancements and everything is at least a 100 years old without 'allowed' revision and the peer system is corrupt and outdated. Like any institution that goes unchallenged for too long, it becomes fat, lazy, arrogant and useless, and I think WIMP is about as desirable as it gets and that's depressing.
IamGrimalkin sorry for ranting.
Dr Becky this is a really excellent summary, thank you so much.
Your channel is always great but this is one of your best yet.
I study dark matter and this was the best comprehensive video I have seen. Great job.
Any updates ?
you are amazingly smart, funny, and gorgeous.
You have done it again Dr. Becky. I am a 13 year-old amateur astronomer from Rwanda, an African country. You are an inspiration.
Thanks for watching - so glad to hear you enjoy my videos 🤗👍
I love Dr Becky's enthusiasm
Thanks Malik 🤗
Small point but I think dark matter is a fairly good translation of matière obscure. Obscure does have the meaning you mention in the video but it also means "something that emits few light" or dark.
This video really underplayed the importance of Vera Rubin, who did the most accurate surveys of galaxy star rotation speed vs the expected speeds for a large number of galaxies and observed what is said to be the first direct evidence of dark matter. I've seen several dark matter documentaries over the past 20 years that clearly point to her as the main person. Could her role have been overplayed by such documentaries? She must have done something to get an observatory named in her honor that has a 28ft diameter monolithic primary mirror and a 4 gigapixel camera!
your pronunciation of "matière obscure" is so cute i can't handle it :p
Me, reading the thumbnail: "How dark do we matter know exists?"
Joking aside, love your videos, Dr!
ROFL, Love the channel, but really love the outtakes at the end. Great information and passion, with a dash of comedy.
Your presentation of the historical chronological timeline of the discoveries that led to our current level of knowledge of the universe was eye opening and understandable for a non science person. Please add a link to your new audible book. Very well done!
It's really cool that you narrated you own book. More authors should do that.
William Pullman does an amazingly good job reading His Dark Materials, along with outstanding character actors.
Best summary out there of all the research on Dark matter !
You do such a good job at explaining
This was less of a video,
And more of a Course.
(Well Done.)
I don't know if you've made it already, but it'd be good to see a video about all the problems with dark matter, from how all experiments to detect it have consistently failed to the various observations that cannot be explained by it.
Thank you, you and Neil Tyson are my favourite people to listen too, both so excited about their work
Amazing video thank you for making- I’ll get your audible book right away!