Anyone who has dropped a guitar pick knows about searching forever to find something you know is there.

Teacher: "Why is your score so low?" Me: "You only seeing 5%."

I love stuff like this. I wasn't the only kid in the 60's to ask the geography teacher why the continents looked like a jigsaw puzzle. I wasn't the only student in physics to ask how come there are spiral galaxies when the solar system is not spiral at all. Even in my degree, they insisted that proteins denatured at high temps when you can clearly see the green slime in Iceland and Yellow Stone. Love listening to these young minds, this lady and Diane, their eyes are wide open to anything.

That was a solid video!. I'm familiar with the content, but still found your descriptions and information to be a big value added!

I like that she used Siri to confirm her answer, not to give her the answer.

“we have narrowed down the mass to 90 orders of magnitude. It’s between a neutrino and the mass of the observable universe” So you’ve basically nailed it

Great video, Dianna presented in a way that we can follow and understand the subject.

I first learned about this when I was 14, and I was excited that something hadn't been discovered yet and I would get to eventually learn what it was. I'm 41 now, and still waiting.

My last job interview I was asked, "What's your education background. I said "I was working toward my PhD in physics but I didn't quite complete it". Interviewer said, "Nice, how far did you get?" Me: "About the 10th grade."

They only ask "what is dark matter", they never ask "how is dark matter' :(

In the mythos of the original Star Wars continuity, there is a bubble that surrounds the Star Wars galaxy, this bubble is known as the circumferential hyperspace barrier and prevents travel outside of the galactic boundary.

amazing it's like finding "the edge of true love feeling we experience" (a flash back of my study in astronomy 1979-1981 in Bosscha Observatory)

So you're saying we're completely in the Dark, literally and figuratively.

At age 32, bog down by the responsibility and demands of society I kinda forgotten how it felt to be amazed by science. i remember as a kid how science was a lens to look at the beauty of the world. And that feeling is amazing. Science doesn't care about my emotions but I like to be sentimental and be inspired about it. Without the child like wonder of "Eureka" where is the motivation to go search for more knowledge? So thank you for doing this.

I finally understand the spinning thing thanks to the two demonstrators spinning each other! Thanks for your channel!

i find the videos on this channel so interesting, i should really watch more of them.

I'd just like to point out that Dork Energy would make a good name for a band of physics researchers.

_NASA ANNOUNCEMENT_ "We know this sounds weird, but dark matter turns out to be mostly birds... and cake batter."

"Is it possible we don't understand gravity?" Here is the question. There is a hole in modern physics, and it is filled with the idea of 'Dark Matter'.

Your videos are sooo complicated! I love it.

“Without this the Milky Way couldn’t exist” Thumbnail: points to PBS

Dark Matter is a Batch that fixes the Universe simulation Bugs.

Very important statement a lot of people would be quick to ignore: "according to *our* (and current) law of of physics".

Really admire your work. Never been a student of physics but still find your videos interesting. Love from India. Keep up! 😊

Love the book on the shelf "We have no idea" - quite an apropos title for this subject .. matter.

Dark Matter is a myth: stars get a Gravity Multiplier when they're on a kill streak.

Thanks for the explanation. It really helped my understanding. However, the one question no one seems to address is how we know that the galaxies are spinning faster than they should be? How do we measure the speed of rotation of a galaxy? How do we measure their total mass and the mass of the inner and outer stars? What is the difference? What is the variation of results when multiple galaxies are compared?

If you think the edge of the galaxy defies known physics, just imagine how much the edge of the universe defies known physics. Could you even see it if you were standing at the edge? boggling

i saw someone who looked exactly like you the other day while i was playing piano at work, i was like omg are you physics girl, she was confused and asked if it was a super hero

Dark matter is comprised primarily of odd socks and coat hangers.

You can pause this randomly, and she almost always looks utterly enthralled in what you have to say.

I love your show!!! You are entertaining and informative!! Good luck finding Dark Matter.

When the LHC is done with its primary mission, they should use it to crack walnuts.

I love how you showed a clip of a vehicle digging when you said "...looked for dark matter here on Earth". I know it was probably them digging to make something like the LHC, but I just can't stop picturing scientists with little gold-pans sifting through all the dirt going "Nope, no dark matter in this pan" all day

The picture of the galaxy you posted on this show, is neat! I like M-33; i think galaxies are so cool. They resemble whirlpools, tornadoes, and hurricanes, i think there's a strong relevance there.

8:12 "It doesn't have to be any one thing! It could be 40% birds, 60% cake batter." A beautifully ditzy yet somehow appropriate summation of our ignorance. Well done!

So some people might be familiar with the name of Hannes Alfven. He was both an electrical engineer, and an astrophysicist. He applied what he knew of the laws of electrodynamics as laid out by Maxwell, Ampere, and Faraday to what he saw in the cosmos in what are still considered to be 'unconventional' ways, one of which was to interpret the rotation of spiral galaxies according to everyday electrodynamic principles. They even named some plasma phenomenon after him (Alfven waves), and he also was awarded a Nobel Prize in Physics for his work on magnetohydrodynamics, although he later went on to revise his understanding of electrodynamics to essentially revoke his earlier postulates on MHD. Anyway, Alfven noted that the rotation of spiral galaxies behaved like a Faraday disk, or a homopolar motor. Essentially, if you pump an electric current through a plasma, it will rotate due to the Lorentz Force. Since the galaxy is a big pool of plasma, it whirls due to the Lorentz Force but cannot escape because of the concurrent magnetic field created by the initiating electric current. This would also explain the 'how' of spiral galaxies, as well as the 'why'. An interesting sidenote to the above is that there is an almost equal amount of visible plasma as there is hypothesized 'dark matter/energy/etc'. Simply by considering basic nuclear chemistry and the behavior of dipolar atoms in electromagnetic fields, one is able to explain: the observations of the matter at the edge of galaxies and why they do not slingshot away into the void; the bipolar geometry of stellar systems/galaxies/galactic clusters/etc; the axial alignment of visible galaxies; magnetic fields at all scales of observation in the cosmos; high frequency emissions of cosmic objects of all scales. The list really does go on and on... The list really does go on an on and on. Just as Hannes Alfven, who is known as the Father of Plasma Cosmology, applied his knowledge of electrodynamics and the behaviors of plasma to astrophysics, I would encourage anyone interested in astronomy and astrophysics to consider taking a course in either Nuclear Chemistry or even just Basic Electricity. It really and truly makes SO much more sense of modern observations of the cosmos than the old Standard Theory does. Peace :)

Dark Matter: "You merely adopted the dark. I was born in it, molded by it"

Just found this channel, and absolute love it. It’s what I have been searching for, for aeons. Thank you for the great videos.

I love your channel, you’re a natural teacher and east communicator

By the thumbnail, thought it could not exist without Dianna.

"The simple things you see are all complicated" The Who - Substitute

Physics, especially astrophysics, has always been something that I am very interested and passionate about. I never took any Physics classes in HS as my interest mainly developed from star gazing, in my earlier days, to watching countless youtube videos learning about Physics. I'm 32 now and recently started re attending my local Community College to resume the process of getting a degree in Computer Programming. I enjoy computers and love to tinker with them and play games, but I would love to take some Physics classes as well. The joy I feel from thinking about taking Physics classes makes me want to take a full course load and just soak up all the info I can. So therefore, I'm starting to think I should consider switching my major but I don't really know what all fields are out there...tbh, I don't really know what kind of jobs are out there for it or even if it's in demand. The only careers that I could think of would be to teach (not a fan) and I would assume that NASA would need to hire some people who are educated in the field.

Things like this always remind me of" the quote "It may turn out the universe is not only stranger than we imagine, but stranger than we can imagine."

*Fun Fact:* The Big Bang was just Michael Bay directing the Universe

So what you're to say is that we're still in the dark when it comes to matter?

They used to say bumble bee flight defied known physics, until high speed camera's came along.

i like when KZfaq suggests to me videos I've already watched and liked. Because I get to re-watch Diana!

Brief mention of dark energy as a whole other can of worms - can we have a video on it please?

the passion you have is contagious and precious.

@4:22 "some galaxies don't have it at all" That sounds like the key to the mystery.

Learning that some galaxies don’t have dark matter is MESSING ME UP

7:49 "nor has anyone found any wimps" well... here I am

Quiz show host "What is dark matter?" Contestant "Er, no idea" Quiz show host "somehow,... that is correct"

I think one of the problems we have when communicating scientific knowledge is semantics. Nothing in reality 'defies' anything. It just is what it is. Our knowledge is incomplete so when we try to explain something with it, then discover that the observation doesn't quite agree... It's because we are missing something, not because reality says, "I'm going to do it differently just to be awkward"

You asked the question whether dark matter does not exist and we simply have a limited understanding of gravity at a very large scale. I have wondered this myself, but your explanation early in this video of why the existence of dark matter seems more likely was very good. I've listened to a lot of people talking about the subject, but this is the first time I have felt half-convinced.

Actual newspaper article: "Scientists Cannot Find Invisible Dark Matter" One. It's invisible. Two: it's dark. Three: it's the Hide and Seek champion!

Scientists have been looking for this dark matter Me:*sitting on the couch* Scientists: have you seen the dark matter? Me: no Scientists: are you sitting on it? Me: no Scientists: stand up

Immense Love for this Channel 💕

I read a long time ago that there was a quantum foam made up of virtual particles in empty space. The theory stated some particles might escape from their virtual state which might add mass to the universe, which might also add gravity and energy. I believe that is where so called zero point energy came from. Just a thought.

2:28 best explanation of centripetal force.

Dark Matter is science speak for we don't have a clue.

Apparently the connection is the eye strike proposition where when looking at the center of a galaxy the out side becomes a section of the eye strike.

I wonder if faster 'time' rather than faster speeds could be anything to do with what you are seeing if the universe appears to be spinning faster than it's calculated mass appears to be, so you don't really need any more matter to explain the speeds you think you are observing. It's a calculation taking into account the affects of mass and gravity on time that you need.

I learned more from you than PBS Space Time, and any other channel. Thank you for speaking to people like me, who enjoy and are fascinated with space, but aren't a physics guru.

I love how you present and explain the topic at hand. The way that you explain the descriptive nature of the subjects that you present makes it much easier to visualize the concepts of the subject matter.

"I wonder if the explanation is even more complex than we imagine at present" It is. Guaranteed.

this just popped up in my recommendations. really cool gave you a sub, this stuff is interesting . why not learn something new

This is like saying electricity, in 1850, is "Dark steam" . It does work. It causes change.

*Correction: It was astronomer Fritz Zwicky who made the first observations of what we now call dark matter in the 30's.* Lord Kelvin first presented math postulating dark bodies, in 1906 Henri Poincare coined the term 'dark matter' in discussing Kelvin's work, but the first evidence of dark matter using stellar velocities was Dutch astronomer Jacobus Kapteyn, and Jan Oort in 1932 before 1933 when Fritz Zwicky a Swiss astrophysicist obtained the first evidence at CIT. Vera Rubin was in the half a century later, and she was part of a team working for Ken Freeman. All they did was re-measure the same data with 'greater accuracy' using a spectrograph.

People never take into account spacial time/gravity in regards to the speed of the outside of galaxies. Stars distances between themselves is huge. Dark matter does not exist. Stars are just following the gravity well of the galaxy. It's more like they are being pushed along rather then gravitationally connected to each other. .

Fun and easy to understand video. Tanks!

I mean, the answer is that we _don't_ know that dark matter exists. The concept was invented to resolve the conflict between our observations and our models. There's nothing inherently wrong with that, in fact, this kind of thing is very common. But dark matter may just be the next ether, or centrifugal force. The results that we get maybe not be due to a "quirk in math" but maybe a flaw in the way we are observing the universe overall.

*Hello darkness my old friend...*

Your videos are VERY informative. You obviously are very well grounded in the nomenclature of physics. But for us who don't know terms such as "LHC" I suggest defining the term somewhere at the beginning of your video.

Wonderful video. Toward the end, Physics Girl said: "I'm still hung up on the fact that we can only see five percent of our universe." As a species, maybe our "seeing" is limited. We know that animals have a keener sense of smell than humans. Maybe our sense of sight is just as limited. From all the discourse on "dark matter" I have read about, the concept strikes me as being just a label for that which we do not understand. Couldn't we just as easily call it "dark chocolate"? And I further wonder whether dark "matter" is actually the same thing as dark "energy", but just in a slightly different form.

Dark matter was a glitch in the simulation. The patch was cleverly hidden to look like it was always there when someone figures it out.

My theory: Dark Energy = Dark Matter x (Speed of Dark)^2 Dark Matter and Dark Energy are effectively the same thing I know I haven’t included my derivation but I deserve a Nobel Prize, please.

The guitar pick analagy made my morning. Lol. With me, my favorite writing pens always hide in obscure places..clearly, dark energy fields have enveloped the pens

Every thing science has discover and show us so far about the universe, is that everything started from a single point of inflation that originated from nothing that has being theorized that is actually something, that something has existed for ever. Whatever it is, is the other 95% that act like gravity on the scale of a galaxies, by the mass speed. So, yeah, cheers to Vera Rubin!

Needs to say "The observable Universe"

"The only thing that can hold stars in our galaxy is gravity" and what about the power of friendship?

Do you have to remove the beaks before you put them in the cake (or do they soften during baking)?

I love the way she says "Here s a fun.. QUESTION!" 😘

I love how you showed a clip of a vehicle digging when you said "...looked for dark matter here on Earth".

So dark matter is just stuff with stuff that we just don’t don’t know what this stuff is. Awesome.

Very good and interesting video, thanks!

I've always enjoyed talking about physics, particularly with my uncle who is just absolutely brilliant but I have a hard time grasping some of the more advanced parts of physics. My uncle eats, sleeps and breathes physics, he is a commercial electrician by trade but he spends virtually ALL of his free time reading all the academic papers, discussing with his online physics communities. It just gets to a point where my head starts to hurt and my brain turns to mush lol but this was such an interesting video to watch! My uncle says if I'd applied myself more to mathematics in high school and college, I would probably be able to understand some of the concepts and details a little better. Makes me regret not applying myself in math and science mote but I was always an English and history buff

Would love to see an update to this with the new modified gravity information coming out that might explain it without dark matter.

When I turn off all lights in my room and I close all of the curtains then all I see is dark matter.

I wish I had a well paid job that meant I could keep saying to the boss "It's there, we've almost found it, but haven't quite got there yet."

You do such a great job and always find interesting topics! I was glued to this conversation

4:04 My physics teacher while checking my paper

I clicked on this video hoping to understand something, now i think i know less. So im subscribing.

Her guest sitting there is probably one of the greatest explorers of the entire human race. Time is moving faster for stars on the outside and slower for stars on the inside. looking at a galaxy sideways on, what would you see?

4:27 the sass! I wish I knew of physics girl and watched all this live and at release. But thankfully I have 90 orders of magnets dude worth of videos to watch

Nice video !! One thing I'd like to know though, that I've never seen in video from the CERN is....how is the CERN working? Not 'technically', but more like 'administratively'. Are they doing tons and tons of collision every day with different parameters, and put the data available to the researchers, that could find what they need? Does researchers have to make protocols first (if yes, how long does it take between the draft of the protocol and getting the results of the experiment)? How many collision per day are happening? All this kind of stuff :) What is the life of a CERN researcher basically :)

I wish you could have been my teacher in High school, would have liked Physics more.

This could be explained by Moshe Carmeli's modification to general relativity. This allows a differential rotation due to gravity which would come into play in very heavy objects like galaxies. There has been some evidence collected agreeing with this by John Harnett the inventor of the atomic fountain clock.

In this video I find it kind of amusing, two books on the shelf, "We Have No Idea" sitting right on top of a copy of "The Big Picture". Also find it amusing that I don't recall commenting twice on this video already, although I do remember the 'pie chart' comment...