Dark Matter Is Even Stranger Than We Thought | SciShow News

[@ChrisSmith-ec6qp]

2)There's something about dark matter that we don't yet understand. Sounds like a pretty solid option.

[@MinorZero]

The funny thing is that makes 1) something is wrong with our models on galactic scales Automatically true as well :)

[@Kiwi2703]

@@MinorZero Exactly what I was thinking lol

[@voidremoved]

Guys I am still trying to comprehend what matter is

[@voidremoved]

please think of me in your prayers

[@MinorZero]

@@voidremoved Does it matter?

[@RememberTheChase]

Seeker also did a video on this, it was not as good. This video was so mich clearer, you guys present your infromation so well.

[@augusto_tr]

Their quality dropped since they changed from Dnews to Seeker. SciShow on the other hand has only gotten better.

[@nerfherder33]

Agreed. Haven't watched seeker in a long time. Poor quality and terrible presentation

[@stephendatgmail]

Seeker:SciShow as National Enquirer:NPR

[@johndotcue]

Seeker is filled with clickbait and it's just not a good source of information. This is so much better. Plus the hosts in this channel know what they're dealing with, and aren't just doing it for money.

[@AimlessSavant]

Could you make your comment as "mich cleaner" as well?

[@romanmccoy5074]

Could dark matter be a whole class of different particles of differing masses in differing concentrations accounting for some of the inconsistencies?

[@AvantirMardrakYihn]

AFAIK, yes, but by Occam's Razor we're assuming it's not.

[@blacktimhoward4322]

Even if we have multiple particles, they shouldn't have different gravitational influences

[@jean-samuelleboeuf2868]

Yes, in this case, dark matter is part of a so called "dark sector" (also called a "hidden sector"). In fact, most theories that try to explain dark matter assume several distinct particles that interact, similarly to what happens in the "visible sector" we experience. However, it commonly accepted that almost all dark particles should decay into a unique "low energy" particle that makes up most of dark matter halos (e.g. the WIMP particles).

[@RagingShadowX36]

I think that the scientific consensus of this is that this scenario is incredibly unlikely. When you calculate the entropy for macro-systems like the amount of particles in a given cubic meter of area, the sheer number of interactions between the whole system tends towards a state of equilibrium. You can prove this using the intrinsic angular momentum of particles and conservation of momentum.

[@blacktimhoward4322]

@Planet Purgatory per particle, yes, but I don't see how that's relevant. We're measuring total gravitational influence

[@gene51231356]

"We don't understand dark matter as well as we think" Great, so, we used to know exactly zero things about dark matter, and now we know even less than that!

[@blacktimhoward4322]

Knowing its gravitational influence is a long way from 'nothing'

[@entyropy3262]

@@blacktimhoward4322 Ah, so you could prove this mysterious "matter" is matter ? Actually it might not even exist at all besides by obviously not being matter.

[@semaj_5022]

@@entyropy3262 I mean by the definition of matter, whatever it is kind of has to be matter. We can see its influence and the effects its gravity exerts on surrounding objects. So it's definitely there. And it's definitely a *type* of matter. We just don't know what. Hence "dark" matter.

[@entyropy3262]

@@semaj_5022 But where is the proof, that only matter can exert gravitational pull ? What if it is something else, since matter would interact with matter ? That is a property of all matter we know. That actually defines matter as such.

[@semaj_5022]

@@entyropy3262 that's kind of the point. We don't know what the fundamental properties of dark matter are, only that it would have to be matter. The only other option is energy. But if it was only energy, it would likely dissipate or have a much wider range of variation in its effects. But it is consistent enough that, even with new information of new interaction such as this, that it's nearly certain it is a single thing with physical properties. Just incredibly weakly interacting. Neutrinos barely interact with regular matter more than dark matter does, but no one has ever argued that they aren't matter.

[@SirNickyT]

Plot Twist: dark matter is ghosts. And they're everywhere. Lol

[@yahircampusano9767]

Hahaha some people claim they interacts with them taking pictures and recording it with some fancy mics, so i don´t think so

[@donnied6151]

The crack up is the joke about the Flying Spaghetti Monster, considering the filamentous nature of dark matter and its universe wide spread, well it looks like the flying spaghetti monster is quite real :) well done you satirical atheists.

[@donnied6151]

@Vinnie P welll i dk dark matter sure looks like a flying spaghetti monster

[@jorgepeterbarton]

They read too much His Dark Materials then, is the plot of books from over 20yrs ago. (Spoiler alert)

[@mickles1975]

Hank loves the venus.

[@joaonuno924]

I prefer uranus

[@LordBledisloe]

He can't get enough of the V.

[@1TakoyakiStore]

@@joaonuno924 Dammit. Beat me too it 😂

[@SirChocula]

@@LordBledisloe Can we blame him? The V's too good!

[@mardini]

The V love muscle hank even more than we thought we know.

[@Sagitarria]

“Dark matter doesn’t interact with itself” is the reason I always hear for the idea that dark matter is regular matter from parallel universes effecting each other gravitationally. I wonder if this opens that question back up.

[@Mattropolis97]

We’d have to get close enough to test it and see if it interacts with probes we send into it. If matter from other universes interacts with matter from ours then it seems like it’s even less likely that it’s from other universes imo. Keep in mind we only know it as “distorted light” so it could be something totally different like space time warping over long distances

[@davidannett3322]

honestly, I think it's far more likely that a silly statement that should have set alarms off already like "something doesn't even interact with itself" boils down to "you're nowhere near understanding it as you think you are" rather than that meaning that some mystical, even more improvable thing is happening. Don't take all those statements at face value (to be true), use them as indicators of what we don't yet know. Did you really believe that a thing is so magical it can't even interact with itself?

[@Mattropolis97]

David Annett Thank you. You worded it way better than I did but that is the overall idea I was trying to convey.

[@davidannett3322]

@@Mattropolis97 right on my friend!

[@rufusleers]

Well it's the same as how South poles of magnets don't cling together with the other south poles.

[@dynamicworlds1]

I just need to pause and point out that we're talking about an area big enough to encompass an entire galaxy as "small scale" 😳

[@thecaptain29]

"Dark matter is theorized to be even stranger than we previously theorized" Fixed it for you.

[@Narokkurai]

All knowledge is theoretical knowledge, so the inclusion of "theorized" is redundant.

[@thecaptain29]

@@Narokkurai 🙄🙄

[@Narokkurai]

@@thecaptain29 What? It's the truth. Everything we know is founded upon a theory of knowledge that can, at any moment, be overturned by sufficiently strong evidence to the contrary. Even your strongest and most closely held ideas rely on an assumption that you are not crazy, your senses do not deceive you, and you have interpreted all your data correctly. All knowledge is theoretical knowledge. That doesn't make it wrong or invalid, it just means it's vulnerable to being changed if the data no longer supports it.

[@thecaptain29]

@@Narokkurai there are objective truths, to deny that is lunacy.

[@Narokkurai]

@@thecaptain29 Only a handful, and they're very trivial, like "x = x". Everything else is theoretical.

[@ArdrichTKeybus]

If it can interact with other Dark Matter, would it then be possible to have a Dark Matter singularity, I wonder?

[@QuestionEverythingButWHY]

“Black holes ain’t as black as they are painted. They are not the eternal prisons they were once thought. Things can get out of a black hole both on the outside and possibly to another universe. So if you feel you are in a black hole, don’t give up-there’s a way out.” --Stephen Hawking

[@andulul]

Yes, it takes billions upon billions of years for information to leak out of a black whole through the hawking radiation, so how about you focus on making your black hole a livable space.

[@jessstuart7495]

Yeah, if you don't mind being spaghettified, and having all your information lost as your mass/energy is slowly returned as random thermal radiation, after the heat death of the universe has occurred. Sure, why not?

[@maranscandy9350]

Maybe that explains Fermi bubbles.

[@nuclearcatbaby1131]

He basically said that they are actually just gray holes

[@chuckschillingvideos]

You just need to find the beer store and a comfortable place to hang out.

[@gayatridevigovindarajula3312]

It's so great that SR Foxley is still supporting them through the years. Since the time I stumbled on this channel to today. I really think he is great. SR Foxley you are the real hero.

[@SrFoxley]

Aaw, thanks! Thanks also for watching this great content for so long, eh!

[@sheila3348]

The takeaway: Dark matter interacts with fluffy things

[@talltroll7092]

Mofu mofu

[@keithharper32]

interesting finding. We know it can't interact with electromagnetism, so it seems to me that leaves two possibilities for how dark matter can interact with itself: a)it is interacting somehow with one of the nuclear forces or b) there is a whole other force that interacts with dark matter but not regular matter. b sounds pretty exciting but not sure how plausible it is

[@caracaca3259]

It’s is called dark force lol or it could just work with gravity

[@kruler-westoz-nauman3638]

Or its just dust they cant see or bloody calculate yet which is kind of a more practical solution than pointing at the whole universe map and saying " Its all got super secret dragons there"

To be honest, I find this much more interesting than the Venus thing. I very much suspect that it's just some other undiscovered (not biological) process happening there.

[@SerenityGene]

Or Dark matter doesn't exist.

[@dean9472]

Why would we assume dark matter doesn't interact with itself, when we know it forms clusters of itself? Seems pretty clear to me it can attract itself???

[@cjg8763]

I wonder this too. And since it neither absorbs or reflects light, nor does it produce it's own light or interact with the electromagnetic field in ANY known way, and is therefore completely invisible to us, seems to me that dark matter would have to be the most transparent substance in the universe, aside perhaps from the vacuum of spacetime itself if not equal to that. Maybe dark matter is ghosts. Spirits. Souls. Haha.

[@vikraal6974]

If it interacted with itself it would be distributed unevenly among those galaxy clusters as a result we won't get nice 1/r law where galaxies at the edge move at the same speed as the ones at center. That hypothesis fits the data very well. But this new finding throws everything out of the window.

[@timbeaton5045]

@@vikraal6974 Presumably IF, and i emphasise the if, that would depend on the strength of the "self-interactions" if, for argument's sake, we decide that some sort of WIMP fitted the data, then it might be possible to work out what kind of interactions they would have apart from pure gravitational ones. Say, as I said above/below (!) there was some analogue of electrical charge, but weak enough to only slightly change the dynamics of DM particles, then that might be what is providing the differing predictions? Would this charge act like gravity? i.e always attractive? Or more like an analogue of electric charge, with opposite charges attracting, and like charges repelling? Dunno. This is just throwing a few ideas around!

[@TragoudistrosMPH]

@@timbeaton5045 noble gasses don't interact via bonding, so multiple types and categories of dark matter with different properties? I know nothing on the subject, so my ideas are random speculation... :)

[@timbeaton5045]

@@TragoudistrosMPH So are mine! But that's not strictly true, re noble gasses. Some can form chemical compounds, i.e. the larger atoms, where the electron shell shielding allows some basic compounds to be formed with Krypton, Xeon and Radon. But these are all manifestations of electromagnetic interactions. I guess it's not beyond the realms of possibility that DM, (assuming that it does exist, of course) may have some sort of "chemistry" of its own. So far all assumptions about DM seem to consist of assuming that it is some type of homogenous "material". It may not be. Sadly, i don't think i'll live long enough to find out. I suspect this is a topic that will take a long time to figure out.

[@rogersledz6793]

@SciShow Space Thank you for uploading this delightful video. YOU are providing an ESSENTIAL SERVICE for all socially responsible people who chose to minimize their non-essential direct personal contacts, even though it is no longer mandatory. These shows help KEEP US SANE. God bless, be strong and remain hopeful. Roger J. Sledz, Staten Island ( NYC ) 10/5/2020 👍☺️🇺🇸🗽

[@NewMessage]

Really thought this was gonna be about 'Strange Quark Matter'.

[@forixiom7410]

You know, It would make kinda sense that Dark Matter is actually made of Strange Quarks, but well, I'm not a scientist especialised in this.

[@nuclearcatbaby1131]

Strangelets are the prions of the universe. They cause mad star disease.

[@Avitymist]

Damn that's a fascinating discovery. Can't wait to hear more.

[@Xeno_Bardock]

Dark Matter is basically the ether and compression, rarefaction and vortexes in the dark matter/ether are gravitational effects.

[@steveletterman7121]

there was no evidence pointing towards the existence of the ethee, we basically assumed that light must need a medium to travel through hence the ether. However, things are quite different with dark matter. WE KNOW something's there, its gravity is too significant to be ignored. So it's either there's some type of 'matter' that we cannot observe OR our understanding of gravity is deeply flawed. Option 2 doesn't seem very likely when GR has proven itself time and time again. So there must be something exerting that massive gravitational pull.

[@RichardTruth123]

Im definitely not educated enough for my opinion to count but it really seems bonkers to me that the assumption was that dark matter couldn't interact. Its sounds like the sience equivalent of putting a sheet over your head and saying you cant see me so you cant get me.

[@mamaluigi56649]

Make "SciShow New" a recurring show.

[@TheZenytram]

Pls dont

[@daydodog]

What you say?

[@doubletapm4]

Im high so take this with a grain of salt lol!!!! But what if dark matter is some like type 3 civilization that cloaks itself but cant hide its gravitational effects....... hahaha sounded cooler in my head!

[@juanignaciocaso4651]

you mean like a civilization that made so many dyson spheres everywhere in the universe that the amount of light that we see doesn't fit with the gravitational effects we see?

[@Namkify]

"matter that interacts with something isn't as weird as matter that interacts with nothing" I feel offended.

[@timbeaton5045]

Sooo... a possibility is that Dark Matter (whatever that is!) may have some kind of charge associated with it. Some quantum property that acts a bit like charge, effectively. THis obviously would appear to be a 5th force, albeit a pretty weak one, i would assume. So something that acts like gravity, but a bit stronger, but nowhere near as strong as the other 3 forces. This is of course pure speculation, but it would be interesting to see how that hypothesis might fit in with one of the particle based hypotheses about WIMPS. or other competing ideas.

[@TheMongolianMage]

Dark matter doesn't interact with anything but gravity, even other dark matter? Why was that ever an assumption in the first place?

[@Unethical.Dodgson]

Because we've never observed dark matter clumping together to form stars or regularly give off signs that they're reacting to each other. Like when two particles of baryonic matter collide they produce light, heat, and kinetic energy. We just don't observe this behaviour with Dark Matter. We've never seen evidence of dark matter stars or areas of galaxies where the dark matter was divided in such a way as to throw off star orbits around their galactic core. The simplest answer was simply that dark matter particles simply never interacted.

[@TheMongolianMage]

@@Unethical.Dodgson I don't think it is/was the simplest answer. In fact it seems anti-intuitive & you should have a lot of evidence before assuming anything anti-intuitive. Like matter attracts/reacts & clumps, that's what makes it like & seems a good assumption to start from. & maybe we haven't observed stars being thrown off orbit within a galactic core, but we have observed huge voids between galaxies that could be explained by dark matter stars & 'black holes' - so-called geodes (idk why, it's an odd name). These geodes could only be proven to exist right now if two large ones collided & we picked it up on LIGO. Unfortunately their nature inhibits collisions (at least with regular matter) so there's no experiment to be had until some kind of future tech is developed. & what is this idea of a search for a single particle type? Having to make an assumption either way I think it's just as likely there's an entire periodic table of dark matter elements with corresponding dark energies. Our understanding of gravity is lacking (we still haven't proved the speed of gravity is equal to the speed of light with anywhere near a comfortable degree of accuracy or precision), but it's the only way we have to detect dark matter. LIGO isn't even 20 years old yet. So maybe when they build the next big new machine we'll get more answers

[@sqeakgeek]

I have a concept . So the model of time & the universe is a tubular bell shape as it expands what if we are in a SUPER GIANT black hole & the dark matter in & around us is relative which is why we are getting weird results when we test things ( like only being 13 billion old but seeing 200 billion back in time) there is so much space inside we see light inside but if we were out the bubble we could NOT!! but inside the event horizon we do see it plus everything that is in here with us!!! the Multiverse thing! being that it SO LARGE the pull is less then smaller black holes. also explains the expansion we on are way somewhere.

[@QuestionEverythingButWHY]

“Magic's just science that we don't understand yet.” ― Arthur C. Clarke

[@YCCCm7]

To paraphrase his 3rd law, yes.

[@pansepot1490]

I find that quote painfully outdated. Nowadays when people see things that they don’t understand (ie UFOs) the first thing that they think of is aliens, that is advanced technology. Same with rare diseases. When strange symptoms show up people go to the doctor, not to the exorcist. People confused unknown with magic when they had no concept of modern science.

[@YCCCm7]

@@pansepot1490 A lot of people these days go to their gurus and chakra crystals, so we're kinda slipping back. And how do we know aliens aren't magical? They're great about making anal probes disappear... (Into keisters...)

[@WormholeJim]

Exactly! Aliens are doing it, always has and always will be.

[@colto2312]

@Evi1M4chine we haven't done that in close to a hundred years

[@maxim1777]

Great video! Although I agree that we don't know nearly enough about dark matter yet, the first paper's conclusions don't seem very rigorous. First of all, they only consider one galaxy cluster and don't do the same check for many clusters while accounting for cluster orientation. Also, the simulations to which they compare their measurements actually inherently assume that there is 20% less matter in the Universe than we know from other very accurate measurements. This will of course make it look that the cluster has way more lenses than in the simulation. Lastly, they use a physical model to measure the size of the strong lenses/clusters through a combination of the observed velocity of these objects and the gravitational lensing. Their final measurements appear to mostly depend on the velocity which is not as good of a direct probe of how much dark matter there is as gravitational lensing is.

[@ViperFPV]

What if dark matter is what’s behind the event horizon?

[@chuckschillingvideos]

Considering that "dark matter" is an arbitrary, artificial construct invented because fundamental astrophysical theory inadequately describes the way nature works, when he says that it is "even stranger than we thought" what he is actually saying is that the current theory is even less representative of what is going on in nature.

[@Blabla130]

"It made their halos fluffier" is not a sentence I thought I would hear a scientist say

[@WoodysAR]

Start a show with *YELLING!* THANK YOU! Sincerly, -Headphone guy

[@Christosg8]

If dark matter didn't collide with itself and anything else, doesn't that mean that pulled by its own gravity it would eventually concentrate on a singularity? If this thing (particle?) has mass, but doesn't collide with any other mass, what is the thing that causes dark matter blobs, to stay blobs?

[@chaoticstorm8145]

Gravity. If dark matter doesn't interact with itself then blobs of dark matter would still form, but be spherically shaped instead of elliptically shaped like how regular matter galaxies form.

[@colto2312]

@@chaoticstorm8145 gravity doesn't have surface tension.

[@chaoticstorm8145]

@@colto2312 what does surface tension have to do with anything? Gravity will make things clump up so if you looked at a large clump of dark matter (if it didn't interact with itself) then it'd look like a blob instead of a disk.

[@colto2312]

@@chaoticstorm8145 What prevents two soap bubbles from becoming one? That is your argument on not coalescing.

[@beachday4439]

Has anyone thought that dark matter is caused by a alternate universe that is overlapping our own. So the gravity from the matter from this other universe is affecting our own and vice versa. This other universe has more matter than ours and that's why it shows more. And why our matter correlates with it. Because It's gravitationally attracted to it.

[@irvingchies1626]

I'll give everyone a hint: we are actually the dark matter, what we call dark matter is actually the baryonic matter having a surplus over us but because we can't see matter made of positrons we don't know it yet

[@user-ri2qn4qo4k]

This is a really fascinating theory, I'd actually like to hear more about it. 😀

[@octavianova1300]

What kind of self-interaction was used in the simulation? Or to put it differently, how was the field that was used to model the self-interactions of the dark matter particles mathematically formulated?

[@airlink2142]

So the moral of the story is.... "We have no clue....." , well back to the drawing board!

[@IceMetalPunk]

I think it was Neil Degrasse Tyson who once said that scientists are ALWAYS at the drawing board. If you're not at the drawing board, then you have nothing left to figure out and you're not doing science.

[@airlink2142]

@@IceMetalPunk Wise words from a very wise man.

[@NEELZE99]

@@airlink2142 what? NDT is a cocky arrogant fool

[@vrimb1]

We dont know anything we dont know about dark matter. this video also showed we are uncertian about what we do know. so basicly we big confusion

[@frighteningspoon]

I’m pretty sure we simply don’t understand GRAVITY as much as we thought.

[@sacredsteeler]

That's been my conclusion concerning dark matter for years. But then again, who am I.

[@valinorean4816]

That's a minority and implausible idea. Dark matter simply matches what dull maxi-transparent (to everything) gas would behave like very well! Why would you think something is wrong with gravity? What we believe about gravity has a pretty solid justification.

[@bobbobber4810]

@@valinorean4816 I agree wit you. Gravity is something we have access to everywhere all the time... We have experimented on it before we even know what gravity was. Dark Matter, even if there is a lot of it, is far and we can't really experiment on it... only observing it indirectly... So this is wait more logic to concluded that we just didn't know Dark Matter enough yet, and not because we don't know enough about gravity. This IS a possibility but this is a lot less probable.

[@jmackmcneill]

Yep, every time Dark Matter is in the news, it takes the form of some theory saving tweak because the model failed to predict the observations... It is true MOND isn't predictive either, but claiming Dark Matter "wins" because magic invisible gas is a slightly more simple explanation than our understanding of Gravity is less than 100% perfect? THAT is unscientific.

[@jmackmcneill]

@Bob Bobber "gravity is something we have access to everywhere" ...on Earth and at one point in earth orbit where we launched a specially designed sattelite to measure gravity as precisely as possible. Everywhere else we are confined to observations at a distance... which do not match up with theory without invoking a substance which, crucially, we have NOT been able to detect here on earth.

[@pho.phonic]

I love how we don’t know so much about the universe that we’ve written papers trying to prove that we don’t know as much as we think.

[@scienceontheright]

"There's something about dark matter that we don't yet understand." I'm sorry. What DO we understand about something that so far is STILL just an idea? In truth, we only have a smoking gun that it exists at all. There's just a bunch of things that we can't explain using our current understanding of baryonic matter and how gravity works (as we know it currently). We have no actual evidence that Dark Matter exists, or how it works, or even what it is. Sigh. Frustrating. Ideas. Speculation. That's where we're at right now :(

[@yocats9974]

Last time I was this early, Hank looked and sounded sleep deprived

[@daviddavis4885]

**SCI SHOW NEW** Also what’s happened to Venus?

[@SeppukuPlatinum]

phosphine gas found in venus' atmosphere. the reason why it's exciting is because it's a potential biomarker.

[@SeppukuPlatinum]

@꧁Dee Dee꧂ 'ever' is a really long timespan. I think the answer to that is easily yes we will. What's more important to us is whether it will be found during our lifetime s and that is much more difficult to answer. I am cautiously optimistic about that but it's pretty much complete guesswork and depends on a lot of things

[@05TE]

The very large telescope in Chile. You know the one. It's the one up on the tall mountain. It has a really nice view.

[@AverytheCubanAmerican]

We're no strangers to love

[@sheila3348]

You know the rules and so do I

[@loosetube5417]

A full commitment's what I'm thinking of

[@PTSD_Guts]

An idea I've had about it in the past, Since 'spin' of particles interacting with the HBF 'gives' them mass, Why wouldn't this work on larger scales? We can't see it because it isn't real, and could potentially be the result of spinning on the macro-scale?

[@Melomathics]

The idea of dark matter is a joke...

[@bobbobber4810]

What is is then? Tell us if you are so smart.

[@Melomathics]

@@bobbobber4810 I don't know. But what I won't do is go ahead and make up some fantasy idea of matter and call it "dark" (and pretend that this term actually means something scientific) instead of just saying I've no clue what it is. A much more accurate name of this phenomenon is simply "unknown gravity", because that's the only thing we know about. The rest is all made up BS just to make some biased physicists happy.

[@bobbobber4810]

@@Melomathics Gravity is cause by things with mass. If there is gravity, there is mass. If there is mass, there is matter.

[@Melomathics]

​@@bobbobber4810 This shows your ignorance of modern astrophysics, because every sentence in your comment is inaccurate...

[@bobbobber4810]

@@Melomathics You are probably right.

[@SovereignwindVODs]

Cool info. But am I the only one who is more surprised when the president of space ISNT srfoxly?

[@benjystrauss2524]

Did the researchers take into account dark matter alternatives (like mond/teves)?

[@saltamas]

How do the determine that the gravitational lensing is caused by dark matter and not by a dormant black hole?

[@alexakalennon]

Exactly what I was asking myself too.

[@BRUXXUS]

I'm guessing scale. A black hole should lens evenly around its perimeter. If these giant dark matter blobs aren't perfectly spherical, or single points, we can reconstruct the shape based on how the light is distorted when it gets to us. A black hole might look like seeing through a magnifying glass, while a dark matter blob would probably look more like seeing through a melted window.

[@victorunbea8451]

"There may be something we don't understand about dark matter" Naw, really?! I mean the name "Dark Matter" isn't there just because it doesn't emit or react to light, it's there because we don't know what it is or what it does other than have gravity...

[@tonik1222]

2:55 "Most likely means one of two things: 1) Something's wrong with our models on galactic scales OR 2) There's something about Dark Matter itself that we don't yet understand. " ... ... AND ... it most likely means both these things ;)

[@fep_ptcp883]

SR Foxley president again? Who are you, Putin?

[@tomgrimes8379]

Why are you editing each sentence? It looks like you're deliberately editing out a few fractional seconds between sentences to create what are known as "jump cuts." That, in turn, creates this jerky effect between sentences, which is distracting. My suggestion is to quit doing that. It serves no purpose and only makes trying to follow this guy ever so much more difficult. Is this some YouTude aesthetic? If so, it looks ridiculous.

[@markokkare]

Exactly!

[@sezzac155]

Dark matter interacting with itself is less strange than it not interacting with anything. Because it wouldn't be the only thing that interacts with itself. Stars collide with other stars, and black holes merge with other black holes. It's not that much of a leap in logic to me. But maybe i'm on a different wavelength of thought because I also find the concept of Darkfluid completely possible and Dark Matter and Dark Energy is the thing/s we are referring to when we say "the fabric of the universe".

[@Unethical.Dodgson]

Or this is a case of "You're so deep, bruh!"

[@kevinreyes7629]

What if dark matter is alien technology and they are watching?

[@RickySTT]

That’s our SciShow! Waiting until we get more information about Venus instead of reporting things we don’t know yet. (You’d never make it on CNN.)

[@bartmans7]

How would something with mass but that is unable to collide with anything including it self not just constantly form black holes of infinite density. If it can't collide it can gather in a single space for ever right ?

[@vikraal6974]

Yea and the only thing stopping it from converging to a single point is if it didn't interact with itself but now we know it does.

[@john2001plus]

I wonder if the extra gravity could be related to the Higgs field or some as of yet undiscovered field?

[@ZappaBlues]

Another example of Q screwing around with our heads for a chuckle. ;)

[@tobuslieven]

If dark matter interacts with itself in ways as complex as normal matter does, then there could be whole dark matter stars, planets, and life that we just haven't seen yet.

[@fvckyoutubescensorshipandt2718]

The way Hank was trying to contain his excitement at the beginning I was expecting him to announce the discovery of what dark matter actually was. Utterly disappointed.

[@engizmo]

Interesting. But I don't think dark matter can be "stolen". We should look at dark matter as being still. It's our universe that is being molded around it, not the other way around. In fact to say its matter I thinks its wrong. It just gravity thats all. Where is it coming from, I have some ideas on that but its not from matter in our universe.

[@Richie8198]

The problem of dark matter reminds me of that of elementary particles. We know they exist but cannot observe them because they are so small that they don’t interact with light at all. In fact, any attempts to view them changes the particles. Perhaps dark matter is something along these lines - so delicate and elusive that any attempts to unlock its secrets changes it altogether.

[@louisnapolitano]

This can't be played in the background ?

[@Nnamato]

What if dark matter is just more black holes 🤔

[@benollier]

I have a possibly a stupid question. Does dark matter have a gravitational effect on other dark matter? And if it does why doesn’t it coalesce into a dark matter singularity? And if it doesn’t why is it found in clusters?

[@pauljs75]

If you consider gravity as a function of the energy density of normal matter, if you have a region of high enough energy without normal matter - would it not produce the same gravitational effect? Perhaps the "dark matter" is arising from a situation of convergence of energy from multiple sources where no matter is needed? Maybe a bit out there, but considering that energy and matter conversion is a thing, it's not something to entirely rule out.

[@TonyTigerTonyTiger]

Light isn't bent by gravity. The spacetime that light travels through is bent by gravity, and light follows the straightest possible path through that bent spacetime.

[@blakhorizon915]

So I'm going out on a limb here, but if dark matter can interact with gravity, doesn't that mean the gravity of dark matter can affect other dark matter masses? The denser the dark matter, the more interactions, and with nothing else to react with, its effects would grow exponentially? I'm genuinely curious 😅

[@IceMetalPunk]

You could say the same thing about regular matter... which makes me wonder if there's dark matter "planets" and dark matter "stars"...

[@jmackmcneill]

That's not going out on a limb... that is exactly how dark matter works... it interacts gravitationally, making dark matter clumps. The only mistake you made was "exponentially"... gravity is a linear force, not an exponential one... the bigger something gets, the more gravity it has, the more stuff it can "eat" and so it gets bigger still. But the process does not accelerate out of control.

[@karlsiegemund1868]

As I understood Dark Matter so far, interacting with itself was not ruled out, just inelastic collision was because of the inability of Dark Matter to get rid of the energy by radiating it as heat.

[@hadzhere]

dark matter doesn't exist...it's a mirage.

[@eriko5647]

TLDR: We thought we knew a little about dark matter but we were absolutely wrong.

[@ultravidz]

DM is just tapioca starch 90° outta phase

[@QlueDuPlessis]

I'm glad you called that. I also think that dark matter interacting with itself seems less weird.

[@IndustrialBonecraft]

We think that the thing we're not sure about might be even more bizarre than we previously thought.

[@mejuliie]

Not that it matters, but I like this new theory so much more. Mostly, because for my pea brain, it never made sense that dark matter (or any matter) would not interact with itself. And now I get to enjoy the ego boost - that comes from (maybe) "being right" - for just a little while. I will allow myself to bathe in the warm glow of my superior intellect, because "Duh?! Of course, matter interacts with itself. Isn't that obvious? It is only logical, for it to do so.".

[@michaelkahn8744]

Alternative Explanation of Dark Matter and Dark Energy - 4-D Hypershere model of Universe can easily explain Dark Matter, Dark Energy, Void and even the reason why the measurement values of Expansion Rate are around 70 km/sec-Mpc Dark Matter, Dark Energy, Gravity, Void and Antigravity, ... all these are same phenomena. They just look different. The problem of modern physics is they're trying to explain everything with particle physics and the physics is being cornered more and more to the dead end. To escape the dead end, they invent or design another imaginary particle in vain instead of trying to revise their way to approach to the problem. I agree to that idea that the interaction between mass and space must be explained with quantum mechanics. But that doesn't mean gravity is the QM phenomena. That's because gravity is not a force. Dark Matter, Dark Energy, Gravity, Antigravity, Void... all these are just joint effects of the expansion of the Universe and the curvature of spacetime. Details are given below. Einstein’s theory of General Relativity states that spacetime is curved by the presence of mass. This curvature influences the motion other objects with mass and gives rise to gravitation. Thus, gravity is a result of geometric features in spacetime. However, we also observe gravitational effects - curvature of spacetime - in areas without any detectable mass. This has given rise to the concept of dark matter, which is matter that does not interact in any detectable way with normal matter, except through gravity. So, there is some large quantity of dark matter scattered throughout the universe, which curves spacetime and causes gravitational effects just like normal matter, but we cannot see or detect it with any known method. An alternative theory to the identity of dark matter is proposed - it is not matter at all, but rather an intrinsic curvature of spacetime. In other words, spacetime is not naturally flat. Even in the absence of matter, we observe some inherent curvature of spacetime. So, the question is now - why is spacetime naturally curved? Why is it not flat in the absence of mass? The universe is 4-dimensional, with 3 spatial dimensions and one dimension in time. Rather than consider time as a linear dimension, we can consider it as a radial one. Therefore, rather than describing the universe with a Cartesian coordinate system, we describe it with a 4-dimensional spherical coordinate system - 3 angular coordinates, φ1, φ2, φ3, and one radial coordinate in time, t. We live on the 3-dimensional surface of a 4-dimensional bubble which is expanding radially in time. Thus, the Big Bang represents t=0, the beginning of time. The crucial point is that the expansion of the universe is not homogeneous in all directions. The expansion rate at one point on the bubble’s surface may differ slightly from another point near it. The universe is only roughly spherical in 4 dimensions, the same way that the Earth is only roughly spherical in 3 dimensions. The same way we observe local mountains and valleys on the surface of Earth, we observe local “mountains” and “valleys” on the surface of the universe bubble. The inhomogeneity of the expansion of the universe has given rise to natural curvature of spacetime. This natural curvature causes the phenomenon of “dark matter”. “Valleys” in spacetime pull matter in, similarly to the warping of spacetime of massive objects. So “dark matter” is really “valleys” in spacetime that are expanding slower than the regions surrounding it. These valleys tend to pull matter in and create planets, stars, and galaxies - regions of space with higher-than-average densities of mass. Conversely, “mountains” in spacetime will repel matter away, an “anti-gravitational” effect, which gives rise to cosmic voids in space where we observe no matter. Each point on the surface of the universe bubble traces out a time arrow in 4-dimensional space, perpendicular to the surface. These time arrows are not parallel to each other since the universe is not flat. This causes points to have nonzero relative velocity away from each other. It is generally accepted that the universe is expanding faster than observable energy can explain, and this is expansion is believe to be still accelerating. The “missing” energy required to explain these observations has given rise to the theory of dark energy. The time dilation caused by non-parallel time arrows can be proposed as an explanation for dark energy. Alternatively, dark energy is real energy coming from potential energy gradients caused by non-parallel time arrows. As a sanity check, we can calculate the expansion rate of the universe based on the universe bubble model. Since the radius of the universe bubble is expanding at the speed of light in the time direction, it increases at 1 light second per second. Therefore, the “circumference” of the 3-dimensional surface increases by 2π light seconds per second, or about 1.88*10^6 km/s. This expansion is distributed equally across the 3-dimensional surface, so the actual observed expansion rate is proportional to the distance from the observer. At present, the age of the universe is estimated to be 13.8 billion years, so the radius of the universe bubble is 13.8 billion light years, or about 4233 megaparsecs (3.26 million light years to 1 Mpc). Thus, we can calculate the expansion rate of the universe, per megaparsec from the observer, as: Expansion rate = ((d(circumference))/dt)/radiusofuniverse=(1.88*〖10〗^6 km⁄s)/(2π*4233Mpc)=(1.88*〖10〗^6 km⁄s)/26598Mpc=70.82(km⁄s)/Mpc The popularly accepted empirical expansion rate is 73.5 +/- 2.5 km/s/Mpc, so our calculated value is close. There may be some additional source of expansion (or observed red shift) to make up for the discrepancy. For example, if two adjacent points have some gravitational gradient due to non-parallel time arrows, then light passing through these points will be red-shifted. - Cited from www.academia.edu/82481487/Title_Alternative_Explanation_of_Dark_Matter_and_Dark_Energy

[@kriddius]

I'm assuming this difficulty in understanding dark matter is due to our limitations trying to understand a 4th dimension substance with our 3rd dimension perspectives. I mean, it would be like a circle trying to fathom the shape of a sphere, right? Some things may never be completely understood. I don't know, I'm just an idiot who finds space fascinating.

[@nikonissinen6772]

holy crap I got almost anxiety for hank just starts talking without intro first

[@tsmspace]

i just ignore dark matter altogether. Its like when they used to say cells didnt live deeper than a few meters and trees were the deepest living things on earth. You're like,,,,,, well,,, that's stupid,,, I guess theres nothing to do but wait until the baloney is over. I wonder how it's going to impact politics.

[@tonik1222]

"We don't understand dark matter as well as we think ... it only interacts with things through its gravity ... it can't collide with other stuff including other dark matter" That's an interesting set of sentences ... First the only thing we know of dark matter is of its gravitational eff... oh wait we're not even sure of that - perhaps the weird gravitational anomalies we observe have been incorrectly described as matter because of our old-school bias, that things that exists ARE Matter (and if we can't see it it must be Dark ...) If you question that assumption, then the whole idea about existence of Dark Matter crumbles (we're still left with HUGE gravitational ANOMALY to explain!)! Now if we've managed to look outside the Dark-Matter-Box way of thinking, and note the novel idea that Gravity doesn't actually exist - but what we observe as Gravity is the inevitable movement of Stuff thru Time in curved Space-Time fabric. ( If you're not familiar with that idea /or if - like me - still struggling to grasp it fully/ see: Vsauce "Which Way Is Down?" kzbin.info/www/bejne/jpSXqYyXmLmoY6c or/and Science Asylum "The REAL source of Gravity might SURPRISE you..." kzbin.info/www/bejne/fGazl52phcl1sMk ) So if just look this way on things this sentence "it (Dark Matter) only interacts with things through its gravity" becomes completely void of meaning - The subject in question that we can ONLY describe by its Gravity (that might not even exist!) effect on other stuff. As I said there's still really HUGE *Gravity* (for the lack of better word at the moment) anomaly to explain, but now perhaps we can start with different assumption - not one of Matter-that-we-can't-see, but with apparent Space-Time curvature that can't be explained by observable baryonic matter. Then we can focus on describing characteristics of SpaceTime-Continuum better than when it was last discovered (over 100 years ago!) Just couple of wild thoughts: Perhaps SpaceTime fabric doesn't curve ONLY when there's matter in it? Considering the estimated for the apparent flatness (on large scale) of SpaceTime, assumed to be flattened by the Cosmic Inflation, perhaps it's possible to have local SpaceTime curves left from who-knows-what that are just not straightened yet (that's most likely not the case but you get the idea - have we made enough experiments with elasticity of SpaceTime fabric on small - ie local scale?)

[@Theraot]

The thing is, if Dark Matter interacts with itself. It does so by a force other than the ones we know. If there is an additional fundamental force, then there might exist something that can interact with both dark and not-so-dark matter via that additional fundamental force. And who knows if we might be able to some day exploit that additional fundamental force for our own benefit. For now, it throws a wrench in any and all current attempts at a theory of everything, because do not account for that additional fundamental force.

[@basildaoust2821]

You are extremely funny. "There's something about DARK MATTER ITSELF that we DON"T YET UNDERSTAND". From everything that I've heard we seem to have no clue what dark matter or dark energy is yet and everything seems to be a lot of guesses. And has things changed because I thought the visible matter was only 5% not like 15 or more that your graphic showed?

[@SciHeartJourney]

According to Einstein, matter bends space. This distortion in space influences moving objects towards the center of mass for the overall system. We're all racing at 1000 mph right now, following this path our mass wants to go. But the ground is IN OUR WAY, blocking us. We call this gravity. According to what little is known, Dark Matter does the same, it bends space. BUT it doesn't follow those distortions in space; supposedly it's NOT attracted by other dark matter, so it doesn't clump up like regular matter 🤔😳🤯. What? Based on this, it seems more likely that matter is just following dark matter around, or did I get this backwards? 🤔 If dark matter was following regular matter around, then it would just build up in the center of regular mass for large objects. I find that very difficult to believe.

[@gl1500ctv]

They found dark matter as a way to explain how galaxies spin without flying apart from the lack of visible material (by Vera Ruben.) So if a galaxy "steals" dark matter from another and that makes the donor galaxy "fluffier" can enough be lost that the donor galaxy "flies apart" from the spin?

[@oracleofdelphi4533]

So regarding your closing comment, if you found matter that interacts with nothing, how would you know you found it?

[@robertgamble7497]

Since you can only see the effects of dark matter, how do you know you are no seeing the sub harmonics of the main effect?

[@bongosock]

Whenever I've heard old ideas like 'aether' or 'phlogiston' discussed in a formal physics setting, it's with a kind of superior, knowing chuckle. But somehow, 'dark matter' is not. My theory predicts X, I observe Y; no problem just add dark matter/aether/phlogiston and it will all be okay. I love physics, and the scientific method, but the podium on which it's placed leaves me a little cold.

[@richarddeese1991]

Thanks. This is very interesting & exciting news! Now... @3:00 - I'm fairly certain that *_both_* 1 & 2 would have to be true; they very much go hand in hand. After all, if there's something you don't understand about the phenomenon, you can't get the model right. And if there's something you're consistently getting wrong about your model, then there's probably something you don't understand about the phenomenon in question. [But if you're consistently getting your model wrong - even though you understand the phenomenon pretty well - then that's just a big "DUH!"] Anyway, I'd love to know what scientists think about how dark matter interacted with - and affected - the very early universe (pertaining to the first stars, etc.). Thanks again. tavi.

[@john2001plus]

We don't even know if Dark Matter is matter. We just know that extra gravity exists that we can't explain. According to Einstein, gravity isn't so much of a force as it is a side effect of curved space-time. Even while we are still we are moving through space-time, and the curvature of space-time exerts a force on us. (Which to me sounds more like a cute mathematical model than reality.) I wonder if the extra gravity could be related to the Higgs field or some as of yet undiscovered field? Do Black Holes have Dark Matter in them? Do Neutron Stars have Dark Matter in them?

[@gijbuis]

Perhaps our lack of understanding of dark matter should be seen as a lack of understanding of gravity??? Newton's theory of gravity was amazingly accurate - it explained almost all the stuff we were experiencing. It became the bedrock of science. Then Einstein upset the apple cart by showing how gravity and acceleration were pretty much interchangeable. That was a whole new way of thinking about what gravity really is. But still we didn't have a 'theory of everything'. Classical mechanics explains a lot, general relativity explains a lot and quantum mechanics also explains a lot - but they are not comptabile... and anyway, as Feynmann remarked: nobody understands quantum mechanics.

[@NoggleBaum]

Y'all barking up the wrong tree, the dark matter ship has left the harbor, Elvis has left the building. Dark matter DOES NOT EXIST.

[@eldritchabomination0]

So....dark matter interacts with itself inside galaxy clusters (or a more condensed/'full' space) but doesn't with....the space outside galaxy clusters? Idk that's what I got from this lmao.

[@ristopoho824]

Ghosts Of Aliens!! I've been on internet too much for today already.. Having more ghosts in the central clusters would make sense, since intergalactic travel and thus, larger civilizations would be possible. There's just one problem. There's dark matter in our galaxy, and since i last checked, the only found civilization in here wasn't galaxy wide. And not old enough to produce enough ghosts to weight more than the galaxy itself othervice, specially since the weight of the soul study was kinda flawed and cherrypicked the results so badly it doesn't even give a direction. But yea. Alien ghosts please.

[@Websurfer1111]

I wonder if dark matter could be able to form "molecules" with it self, in the small scale cases, because molecules are heavier than their parts, because of the high binding energies stored.

[@infinateU]

Ah, the Legacy system. 😐. Before declaring complete ambivalence please explain why Gravity replaces Electro Magnetism.

[@rhyanmiller8298]

Gravity in mass quantities has mass? It’s like what sherlock holmes said. Something like, when you have eliminated the impossible, whatever remains, however improbable, sounds completely ridiculous.