What is Dark Matter? A Mystery of the Universe

You've probably heard the term Dark Matter, but what is it, and how do we know it exists?
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[@wildfire2532]

Please continue to make more videos! I am an elementary school teacher (still looking for a classroom) but would love to use these videos to teach my future science class. It's these kind of video's that really catch childrens interest.

[@physicsgirl]

Thank you for the comment! I am trying to reach a broad audience at the moment, but eventually would like to aim more toward younger kids, especially girls.

[@LamirLakantry]

What if there's a dark matter planet out there, with dark matter aliens, wondering what the missing extra 5% of the mass is. :P

[@DawnHub666]

That's amazing -

[@Nick-wv4kg]

wow

[@MegaRazzzz]

Mind = Blown

[@baloocraft6379]

Good question

[@abhishekrohilla3530]

EE Ehrenberg dark matter don't interact with electromagnetic force, how do u think,it will make up aliens

[@hotguysandhistory]

You are so cool and your videos are so interesting! Thanks for being a role model for women in physics. As a 15yo girl who wants to do a physics degree, your channel is so inspiring and it's great to see another girl/woman who is successful in physics, yet seems so down to earth, friendly and cool!! Keep it up :D

[@physicsgirl]

Thank you for the comment! It is my dream to reach young women and show them what there is for them in physics (as my teachers once did for me). I hope you never lose that interest in learning about the world!

[@Lineage2ErtheiaPvP]

+hotguysandhistory what is she succesfull at? she s pretty that s why ppl watch.

[@sarahmueller335]

We have a lack of scientific teachers at the high school level. It is mostly, education professionals that have a learned a bit of science. My concern is the lack of critical thinking being done due to the pressures placed upon the teachers to acquire higher grades for state exams. Critical thinking is vital. You will no doubt have to absorb so much information over the next several years but the love for discovery of increasing your knowledge base will fuel your desire. Never stop questioning. Especially in college! Some professors will look at you like who do you think you are but the great ones will be intrigued and give you guidance. I tell my students to question everything and be skeptical when going over the empirical evidence. Give it a fresh view and do not automatically see what you have been told to see. Truly view it from all possibilities and then make your conclusion. And just because you are inexperienced do not let that hold you back. Rise to the challenges when presented and relish the sacrifices you made towards obtaining your goals. In time it will be you that teaches our youth. Do not make the same mistakes your professors will make with you. Good luck with all your endeavors.

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i agree !

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@@physicsgirl.

[@EconomyofTruthHub]

"You see, galaxies are like mean girls and are often found in clusters." Hahahahahahaha....pure gold.

[@BryanSeigneur0]

I'm in the it's-all-cold-baryonic-stuff camp (and misunderestimated singularity masses). And 'cosmological models say that can't be the case' is the best response I've heard to my assertion. Kudos to Physics Girl for being the absolute first person I ever heard it from! Even after a lot of wikipediaing. I'd like more explanation of that response. I respect the cosmological models because of the cosmo expansion explanation video she did. Once again, it told me more than I knew and in a super easy way! Go PG, go PG!

[@sandipbaidya2839]

why couldn't I have stumbled upon your channel few years ago? I really love the way you talk about things, things become intriguing! and so much more fun.

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Awesome channel! Physics explained in a really simple way! And you're fun to watch! Subscribed!

[@BeingHumane173]

Your Physics Videos are really interesting, informative, thought provoking and awesome...Really loved them...Happy physicing !!!

[@JacobBeckey]

Thank you for making physics videos! I hope you continue to make them.

[@francescamarshall4088]

Thank you so much for making this video. I knew that there was something called dark matter but I didn't quite know what it was but you have explained it and now I know what it is and I'm really happy!! :D

[@timothyperkins8907]

I like your style of presentation :) Read some very theoretical article in Sci Am about a year back re hypothetical more complex dark matter chemistry with photon analogues - odd terminology I thought! Subscribed, people like you help me understand things better as a layperson. And I think that's more important than ever now. Thanks;

[@kimberlyjenks9989]

This is so incredibly awesome! Thank you SO much for doing these physics videos. This is the first video I've seen and I love it! Thank goodness for physics nerds. :-) (although I'm mech eng... I love physics!)

[@physicsgirl]

MechE and physics are very related. Glad you like the videos!

[@kimberlyjenks9989]

Yup, keep at 'em. :-)

[@AaronBrooks1]

Great explanation and nice work - Thanks!

[@BenjaminSArman]

Love anything and everything to do with physics, you definitely make them so much more enjoyable!!!... So much more enjoyable... Thank u

[@4869shk]

I love your videos! So informative and interactive! :D

[@crackpapa_]

Darkmatter is phenomenal cosmical power that genies are able to use so Aladdin can show Jasmin his *"WOOORLD!*"

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physics girl you're the best. I think you're fantastic.

[@realitycheck7865]

I really think your videos are great.but I did kinda felt a bit too simplified in here and there. but you have a way of explaining complex things in pretty simple terms. gotta say, that's soo awesome. and I came here from PBS. he was right, great channel, love to see more.

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I've been watching your videos for a long time and you're doing great! !(:

[@DougKutner]

I should be falling asleep but your energy , intelligence, and enthusiasm have sitting bolt upright

[@manishbajracharya]

quite an interesting way of presentation. Loved it

[@OlleSecond2none]

Awesome videos! Learned a lot :D

[@physicsgirl]

That is my goal! Thank you. :)

[@leahg180]

Checked out this channel at Vihart's recommendation and I'm here to stay! I love how you don't just tell us everything and instead ask questions.

[@physicsgirl]

Glad you like that! Some people hate it when they're asked to think.

[@jdgrahamo]

When you think about it, we don't even know what matter is or what energy is. We interact with (I hesitate to say 'see') certain events; but we haven't a clue what's really going on. Matter is mostly empty space, and the bits that aren't are so small that we have no idea what they are, how they do what they do (or oven what it is that they do) or how they came to exist.

[@fzr2k840]

Good video. So can we call the humor in this video, dark humor?

[@physicsgirl]

Haha, I should have only used dark humor now that you mention it..

[@lars38010]

Nice joke. But dark humor is already a thing. It just means very obscure and offensive jokes.

[@FluffyFractalshard]

dark humor is like food, some people just dont get it

[@kaptencgp]

I know all of this already, but I love yer videos, so I keep watching. You're doing a good job, keep it up. :)

[@physicsgirl]

Either you study physics, or you are very well informed so keep that up!

[@kaptencgp]

Physics Girl I study computer science, but am very interested in science in general.

[@tchevrier]

maybe there's a false assumption being made. Eistein essentially theorized that gravity was simply warped space-time caused by a matter. We assume that matter is the only thing that can warp space-time. So when we're looking for the source of all this missing gravity, we naturally look for missing matter. Maybe its not matter we should be looking for. Can energy warp space-time? Since matter is essentially energy interacting with its surroundings (possibly the higgs field), it wouldn't be a stretch to think that energy could warp space-time as well. Then again, maybe space-time is just naturally warped.

[@dangiscongrataway2365]

It's not mass that bends energy, it's energy momentum density pressure all those stuff

[@paulgotik]

+tchevrier I think the problem is energy, has we define, mathematically can´t do that. For what you say being true we need to redefine all of math and phisics we know.

[@tonee899]

lol no.

[@propellerhead9197]

i WAS THINKING THE SAME THING. Sorry about the cap lock.. Like gravity leaking through from another dimension perhaps...??

[@babybaby4415]

greg levin dimensions huh? Why are adding multiverses into the existing unanswerable hot topic called dark matter

[@comander742]

Love love your videos!!!

[@pawanpandey9837]

I accidentally bumped into your channel, it's amazing:). Subscribed

[@joshuabailey5239]

First Physics Girl video I've ever seen, Thanks to PBS SpaceTime for the reference. VERY entertaining and informative, and Sans formal education, this type of broad speculation and education is a little more my speed.

[@srpenguinbr]

who is watching this video in 1996?

[@apenasmeucanal5984]

Ninguém Felipe, ninguém.

[@srpenguinbr]

como vc sabe que eu falo portugues?

[@apenasmeucanal5984]

Felipe Lorenzzon ( ͡° ͜ʖ ͡° )

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Internet Explorer ??

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KZbin was created in 2005.

[@hassanabdiyussuf8706]

i love phisics and you young lady filled me with more

[@CoveiraoPS3]

Great video, thanks! Your videos should have much more views because they are awesome!

[@physicsgirl]

Thank you! I already have more views that I had imagined :)

[@physicsgirl]

New video answering the question, What is Dark Matter? buff.ly/1peQo0j

[@timefororbit]

I put up posters in my neighborhood: Missing mass, please call if you find it.

[@AlfonsoRamirez2001]

I think that Dark Matter is transparent matter.

[@alfstolenable]

More more more more more more more please

[@R3Cat]

Alfonso Ramirez WRONG WRONG WRONG

[@nightmisterio]

Re when she connected the mass and gravity, right?

[@PiePierrot]

Thanks for this video explaining dark matter, I have to do a project for school and I decided I wanna do mine on either antimatter or dark matter so this is helpful! :)

[@gueuzelambic9787]

Fritz Zwicky... ''A dude'' ??? This is why we love you Dianna. Thank you so much for all your hard work. I wish you all the best in your future endeavours.

[@KartikayKaul]

Thank you physics girl. You make understanding physics Possible from Impossible.

[@2serveand2protect]

It's amazing how SIMPLY - yet CLEARLY - You explain things! ..."STRAIGHT-TO-THE-POINT"!... Congrats - thumb up & subbed - have a nice day everybody! ;)

[@winsenken]

love your videos!

[@lin4cba]

If there are that much dark matters, how come getting dark matter in Final Fantasy is so hard.

[@pragmat1k]

Obvious, because chances are we can't directly interact with it. ;D

[@physicsgirl]

Because it is so elusive? I'll have to start playing video games to find out.

[@lin4cba]

Physics Girl LOL it was just a joke. But yea, Dark matter is usually the rarest among the rare item in most Final Fantasy game. :) But it is entirely different thing to what you said in the vid though. xD

[@TumbleSensei]

LOLOLOL

[@saomaitran65]

lin4cba ♑️♑️

[@anatheathen]

i really hope that videos like this will be accessible hundreds/thousands of years from now where all of the answers we're looking for is common knowledge..

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I love your videos!!!!

[@Suburp212]

Great video. Awesome macho buff. Looking forward to the answers.

[@sphong0610]

Ha! This one is a older video but it was really fun and goofy albeit not as informative. But I still love how you love to get people to think on there own. GREAT!

[@deepvybes]

This is probably the best high level description of dark matter I have seen!

[@depiethepinkunicorn5723]

omg I m obsessed with your videos😱😍

[@killsnskills]

2:19 "OH NUUUU" i love this channel

[@mostafaelkady192]

Only from info from this video, I could guess that WIMPs interact with light...? and maybe the need all that mass for more energy.. not sure why though. I really enjoyed watching this video and would happily watch all the rest (: Thank you and keep going!

[@JungleJargon]

Gravitational lensing is when light has to travel through more frames of reference so that it takes longer to arrive.

[@Logh0s]

Hi from Argentina!! I love your videos!!!

[@physicsgirl]

Argentina! I wish I were there right now. Thank you :)

[@rm-creations2387]

After seeing this video, I've learnt Some Cool dark matter stuffs .. I'm eagerly waiting for your videos @physicsgirl

[@suruchishahi4018]

thank you physics girl for this video

[@shaunindia]

thank you so much

[@edrepresentin]

I like the way you explained Dark Matter. Thank You.

[@TheSmilesClub]

Nice explanation!

[@physicsgirl]

I hope it was clear enough. This is a confusing topic.

[@EvolBob1]

+Physics Girl - I especially like the admission we could be completely wrong. Try as I might, I haven't come up with a better solution to 'What is Dark Matter'... excellent presentation video on the subject Dianna Cowern. But I do have my doubts: Question - can quantum entanglement affect gravity?

[@seanvermilion7256]

Very cool and entertaining!

[@ujjvalkulkarni1833]

That was a really cool video. Please make more 😁

[@0601013046]

one word- AWESOME !!!!!

[@andrewgoldman7599]

2:03 I have a hangover. You killed me with this effect.

[@Mcormic]

Reminds me of the Fermi Paradox. If there's supposedly so much dark matter, well, where is it? How are it's mechanisms so undetectable? Fascinating fascinating stuff.

[@life42theuniverse]

1:52 when you play the game with your friend it is tension in the arms which increases in proportion to the rotation rate. The tension comes from electrostatic forces in the molecules of your arms and bones. When we are talking of a galaxy spinning we "know" gravity is the only thing that could provide the tension... therefor the evidence of a higher tension is a statement of higher mass. However, only because we discount the forces responsible for the tension. If other forces are at work in the tension then those forces could account for differences and not some undetected mass.

[@iskiinthefastlane]

You are absolutely hilarious. As someone who thoroughly enjoys the science of physics, thank you for these videos :)

[@physicsgirl]

Glad you enjoy them!

[@toopyandbinoy8893]

Wow really confusing topic but it's one reason why I really love it. Nobody really knows what is right or wrong, you just believe something and try to prove it right :) Great Video, keep up the good work.

[@physicsgirl]

Thanks! It is a tough concept, because it's something we can't experience in our every-day lives.

[@nishitsalian7441]

"Well, how do we ever know something's there that we can't see?" I like that pause after this dude. That was well done.

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Awesome video!

[@Setze78]

At first i was like "Well she's cute, there gonna be thousands of desperate guys remembering her this" And then i was like "oh god she's doing a REALLY GREAT JOB, and there's too few people watching her videos". So, i hope there will be a lot of new watchers/suscribers, you really deserve them, thank you (from France for what it's worth) !

[@anjaliamrutkar7099]

A very good video..liked it very much.. your videos are awesome....you are looking like Elsa from Frozen in this video...

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This channel is a dream come true

[@Youezor]

"and voilà!" I love when English speaking use french words ! (and your video is great, as usual)

[@charlesbrightman4237]

"Gravitational Lensing": Since photons have both an electric and magnetic components to them, and since electrons have an associated magnetic field with them, then when photons pass atoms and molecules, the interactions between the electro and/or magnetic fields causes the less massive photon beams to bend.

[@pearlsayarath81]

We saw this in science class I subscribed!

[@Kat-em7dp]

You are so clever and cool. I'm mesmerized.

[@frankgorham-engard4822]

In the video it is repeated, several times, that dark matter doesn't interact with light. And then Dianna also says the gravity from dark matter bends light. It seems our perspective of the universe always leads us to contradict ourselves and create exceptions to any verbal model or expression we try to create.

[@markwhite350]

Well done! Can you do on on the shape of the universe?

[@physicsgirl]

Thanks Mark! That would be a cool one, on what the "observable" universe is.

[@jpdk1]

physics girl lesson should be made mandatory in schools and colleges

[@kugelblitzed]

I'm not a physics guy:) although I've a lot of interest in cosmology. I've gone through a lot of stuffs regarding dark matter but this video was the most easy and understandable for me. Thank you physics girl. Oo, and you are very sweet too:)

[@ananyasphotorealism]

Watching in 2020 This year servers as "a whole new world" , knowing a lot of new amazing people this year!

[@dermotpayne01]

Thanks a lot for the way you explain these hard things and with great humour too😁 I m a guy hope it s ok😳 I watch your channel you explain it a lot better than most men👍

[@CC-gi3ky]

nice video. Also i understand the main video even if i don't speak english very well, cool!

[@x78340]

She's soo pretty, and smart, and funny...*sigh*

[@angelalewis3645]

So good!

[@adriang.cornejo4800]

As reference, the paper where is described a solution of the rotational velocities observed in spiral galaxies, without using dark matter (but adding the Coriolis force in the rotating system), is the following (from 2020): article.sapub.org/10.5923.j.astronomy.20200902.01.html

[@neethupoovathikkal]

physics girl is just enjoying the beauty of physic👏

[@charybe]

After watching your videos, and based on the fact that the eyes are the only exocranial (out of the skull) parts of the brain (yes, they're mostly made of neurons), we can deduce three things: - When a brain grows too big to fit in the inner volume of the skull, the resulting pressure will inflate the ocular globes in a charming way. - Just as the universe has dark matter, the brain has grey matter (dendritic) and white matter (axonic). I will now add blue matter (optic), because 1) it's a very important matter 2) it's poetic. - The outer part of the brain is much more beautiful than the inner (officially the ears don't agree but they're a bit jealous because nobody ever said "wow, you have beautiful ears").

[@physicsgirl]

Haha, I forgot to respond to this comment but it made me laugh. Thanks.

[@princeedike5896]

" I m too small to hold on without dark matter" this is a summary is the whole video. Well done young physics girl.

[@konstantinkurlayev9242]

Thank you

[@JeffSyam]

Dianna you should do cameo on TBBT :-) Maybe Chuck Lorre can put you as "villain" opponent of Sheldon in Dark Matter debate or.. some sort... Keep posting PhysicGirl! :-) Your channel also help make my daughter interested in science.

[@selinatarushi7482]

you are GREAT!!!!!!!!

[@masterkey14]

I like to learn. You explain it pretty simpel. 😘😘😘

[@tomjamesdoherty]

You mentioned star wars and talked about science, you've got yourself a new subscriber

[@winniebinoj1321]

u are really great

[@Ronathalon920]

I love your videos. I wish I could find a girl half as smart as you are. My mom is an advanced physics teacher and my dad is a lawyer. So education is important. Thanks for the videos they always make me smile. I love science.

[@jessiemarchavez1321]

i love how you explained this matter😂

[@AA-eu4mx]

I read a hypothesis somewhere where they said dark matter may be matter floating around in another space dimension, and since gravity is the "bending or curvature" of space time, although that matter may be in another dimension, it's dimension is still part of space time so we can feel the gravity from the matter in another dimension. I'm not a physicist though so I can't confirm the validity of such a hypothesis, but it would be cool if dark matter is matter from another dimension.

[@ahmadabdullah8168]

Love physics .i cant express my feelings

[@henryvilladiegomusic]

good videos! there's nothing like physics and humor Jaja Greetings from Colombia! ;)

[@kenkalemkarian9877]

Hello! You briefly bought up the dark energy in this video, I understand that the dark matters and dark energies are poorly understood subject in Physics, but very interesting video non the less. Will you be making a similar video on what dark energy might/ might not be??

[@NarvinCheeWood]

"Someone's got a Strength Complex..." :') hahaha

[@ChrisPBacon-yc4si]

you're awesome. nuff said.

[@rodkakarot2553]

thanks a lot