Ask a Physicist 7.2 Dark Matter & Dark Energy part 2

[leahcimrac]

I love your accent buddy. Where do you originate from before England?

[ASKaPHYSICIST]

@leahcimrac I'm German buddy.



[leahcimrac]

@ASKaPHYSICIST Your studying in England though right?

[ASKaPHYSICIST]

@leahcimrac that's right yes.

[leahcimrac]

Why isn't there anti Gravity? If gravity is in the presence of matter then maybe a lack of matter would create an anti gravity effect.

[ASKaPHYSICIST]

@leahcimrac that's like saying a lack of charge should be anti charge. When we know that in fact anti matter has 'anti' or rather negative charge. Gravity is the result of the curvature of space time and space time in the absence of matter is flat. 

[gaynorglowellxsingh]

CERN is a reversed engineered black hole. Plasma is created in black holes as matter is accelerated to almost the speed of light as it falls into it. Is it possible that dark matter and dark energy is the byproduct of the mass that falls into black holes as a quantum soup in a Bose- Einstein condensate, and was released back into our universe during the big bang.

(for more info see video)

[tmierdna]

Anyway thank you for both videos, especially the first part clarified some of the things i was uncertain of.

[ASKaPHYSICIST]

@tmierdna you're very welcome

[tmierdna]

After seeing the video I think there 2 things i'm a bit not clear on:

- It's not clear how dark matter affects the way our galaxy stays together in a spiral form, should we believe that is actually because there's a huge amount of dark matter in the center of our universe

- Could you please make a video about the expanding theory of our universe, after reading neveranythingtodoXD comment about a spiral universe, would be interesting to also show some evidence against this if there are any

[ASKaPHYSICIST]

@tmierdna you dont actually need dark matter to explain the spiral form. The stars further out in the galaxy generally take longer to complete a full rotation than the inner ones and therefore you get that curling effect.

[ASKaPHYSICIST]

also, I'll get into the expansion bit when I get to dark energy, those topics are linked :)

[tmierdna]

@ASKaPHYSICIST thanks, looking forward to it :)

[gyro5d]

If, the magnetic bubbles found to be around our solar system's magnetic field were also around our galaxy's magnetic field and a magnetic lattice pushed the outer solar systems. Would there be a need for dark anythingf If the entire Universe was a magnetic field, wouldn't the magnetic field be expanding and pushing the galaxies apart, the farthest ones the fastest??

[ASKaPHYSICIST]

@gyro5d sorry, but I think you have a few misconceptions about what magnetic fields are and what they can do.

[mickeybro2]

sheldon cooper?

[SayYESon69]

Could you please explain the Higgs mechanism and a Higgs boson. I am very intrigued by it and i believe that it would make a grat episode! Best regards

[ASKaPHYSICIST]

@SayYESon69 I guess, but I'm afraid it wouldn't make any sense to you unless you already had a solid grip of the standard model of particle physics. Trust me, the Higgs is not quite what the media makes it out to be.

[neveranythingtodoXD]

I have a question that's somewhat irrelevant to the video... How do we "know" that the universe is expanding? The only proof Astronomers have is, galaxies moving away... when if they're moving away, galaxies could just be rotating around a central point in the universe... also called, rotation, just like spiral galaxies, and solar systems?

[ASKaPHYSICIST]

@neveranythingtodoXD well, the galaxies are not only moving away, but it turned out that the further they are away, the faster they move away from us. It's like if we were all standing on a giant rubber sheet that was being pulled apart. The people furthest away from you would (appear to be) moving away the quickest, regardless where you're standing on the sheet.

[neveranythingtodoXD]

@ASKaPHYSICIST But that still doesn't answer my question fully, if they're moving away, and rotating around a central point in the universe, they won't be able to live even close to as long as they would have to, to observe the objects moving away, coming back, just think of it like this, 1 universal shape, the spiral (spiral galaxies, solar systems, and even your sink drain) spin, how come just that 1 theory would randomly get rid of that shape? (the spiral)

[ASKaPHYSICIST]

@neveranythingtodoXD if they spiral, wouldnt they get closer

?

[neveranythingtodoXD]

@ASKaPHYSICIST Nice job pointing out what just said ;)

[tmierdna]

@neveranythingtodoXD I like this suggestion of yours and i think it even may be true, but in order for anyone to prove or say it's not true you'd require maybe thousands or millions of years.. if the full rotating cycle would be of let's say around thousands of years and our galaxy may be on an outher layer of the universe we may somehow feel now they are getting further away as perhaps they are on an inner layer and are just leaving our sector to come back in other thousands of years..

[neveranythingtodoXD]

@tmierdna Very true, and i thank you for replying to my comments, as others wouldn't (SixtySymbols, ect..) But don't you think that seeing how fast technology is going already, that people would be able to think of a way to build something that has a greater ability to view objects farther away, and possibly see what their trajectory would be? And possibly prove my theory right, or wrong...

[tmierdna]

@neveranythingtodoXD They should at least be working on it, and make sure the new Telescope or however will be called will be considering the majority of studies conducted so far, as to filter out most of the irrelevant information (due to Gravitational Lensing Event, etc) and just present a picture as close to reality as we can get.. Also a 3D view of the known universe would be nice to be put up together or even better a 3D motion simulation based on the data gathered so far.

[ASKaPHYSICIST]

@AmbidextrousPig yes, thats why we have tides

[MrJmm999]

Probably a really dumb question here. Are ALL galaxies we observe moving faster than we predict....or just some galaxies? For my second dumb question....how do we KNOW that the mass of the stars and planets that make up these galaxies. Have we considered that maybe these stars and planets have more mass than we think. (You can stop laughing now....admit it...you are laughing at my questions).

Just curious.

[ASKaPHYSICIST]

@MrJmm999 Not laughing at all, but i have to check, do you really mean galaxies? In my video I am talking about stars moving too fast within galaxies, the mass of which we know by looking at things like their luminosity.

[MrJmm999]

@ASKaPHYSICIST Will reply la_er. As you can _ell my compu_er keyboard is refusin_ _o _ype ou_ 2 charac_ers.

FRUSTRA_IN_!!!!!!!!!

[MrJmm999]

I saw your comment on NephilimFrees recent video regarding antimatter and darkmatter being the same thing. (he has since taken that video down after telling you that you were wrong). YOu consider doing a reply to his assertion? Or his other assertion that water got onto the moon via pressure from the earths crust shooting ejaculating water onto the moon?

[ASKaPHYSICIST]

@MrJmm999 I thought Thunderfoot did a rather nice job debunking that. But I'll have a look if there is any bad science left that needs addressing. Really quite annoying how persistently some people try to uneducate the public.

[NeumannAlfred]

Super gemacht, sehr interessant und sehr einleuchtend erklärt. 5/5!!!!!!

[ASKaPHYSICIST]

@NeumannAlfred Danke.

[JohnFenomenon]

yes, investing timetravel seems rather a valid subject

[abrowaqas123]

We are waiting for you for another amazing information..

[ASKaPHYSICIST]

@abrowaqas123 bit occupied at the moment, but there'll be more soon.

[XxmcdxX]

Do you thing time travel is possible? Albert Einstein said yes. Theories had said that, to time travel, you will have to attain a speed faster than light. Opinions?

[ollieoniel]

does centrafugal force not effect gravitys shape?

[ASKaPHYSICIST]

@ollieoniel

I don't quite see what you mean.

[ollieoniel]

@ASKaPHYSICIST does centrafugal force effect the shape of the

gravity field around matter? Like would it make a feild that drops off linearly proportional rather than by the square of the distance by reshaping the field.

would that explain why the all the mater spins at the same speed?

[Ra1sErBlAdE]

I would like to congratulate you, the idea to present physics in such interesting and entertaining way is great. it's about time someone made physics understandable for children. I wish you the best of luck in this endeavor.

"Науката е слънце!"

[ASKaPHYSICIST]

@Ra1sErBlAdE

Thank you very much, however I'm afraid I don't speak your language.

[Hatbux]

You seem to be some sort of advanced life form. Where i come from, the smartest thing anyone said to me was "Dude.. seriously.. the sun is a giant stone that caught on fire because it was hit by a meteor" To this day i believed it to be true. Although i may never be as smart as you im ure i can atleast spit farther than you.. lol.. what an achievement.

[ASKaPHYSICIST]

@Hatbux

We're all smart in different ways.

In fact, realizing the limits to your knowledge, as you do, is a very significant cognitive skill that a great percentage of the world population doesn't seem to have.

In the end, it doesn't really matter who of us is smarter. The important thing is that, together, we're even smarter still.

We'll have to have a spitting contest some time :)

[datzfast]

why dont we just call it black magic that way their is no confusion with definition

[ASKaPHYSICIST]

@datzfast

I'd vote in favour of that motion.

[kevinmorais]

Love your videos! Best I've seen ever.

[CelestialHarvester]

Neutralinos act similar to wimps. But since neutralinos have been figured out, they are no longer candidates for wimps. However, this shouldn't mean that wimps can't be a composite of neutralinos and something else--hypothetically of course with what little we know so far...

[ASKaPHYSICIST]

@CelestialHarvester what do you mean by 'figured out'?

[Adrenalx42]

(continued from last post) Also, the cherenkov detectors are assuming the WIMPS travel faster than the speed of light in water/whatever medium they use, which may not be the case. Since they do not interact with the electromagnetic force, they would not emit cherenkov radiation nor would they interact with the atoms of whatever other detectors there are.

[ASKaPHYSICIST]

@Adrenalx42 Thats not how cerenkov detectors work, The wimps interact through the weak force and cause a charged particle to be emitted somewhere in the detector tank, which then might be detected through its cerenkov light.

[Adrenalx42]

Wouldn't dark matter and dark energy be the same thing? After all "energy" isn't a tangible thing. If we were to assume E=mc^2 applied to dark matter, dark energy and dark matter would be interchangable as is normal matter and energy. We use the term "dark" only because the dark matter does not interact with the electromagnetic force. If they were to interact via the weak force, they would decay via known processes and we would be able to detect these processes via the decay products

[ASKaPHYSICIST]

@Adrenalx42 your reasoning is sound ... the naming of the term 'dark energy' wasn't. Dark matter and dark energy need not necessarily have anything to do with each other. In fact, dark energy might not really be energy at all in the classical sense. all we know its something causing the universe to expand.

[sweetser]

Standard explanations, most EXCELLANT for YouTube. I would stress the difference between the observed problems - Newton's law and rotation profiles, galaxy clusters, and g lensing, VERSUS an unconfirmed hypothesis, namely dark matter. F = -GMm/R^2 doesn't work for big things. MOND (MOdified Newtonian Dynamics) wants to go R^2->R but was shown wrong by bullet galaxies.

My pet peeve: Velocity is not conserved, show a momentum profile! F is a change in momentum, not velocity, so show it.

[Moshejetz]

oh and yet again can u plz do an episode on quazares and pulsars after a super nova i am really interested in that topic and i would love to know more

[Moshejetz]

well wat is a quarke star

[Moshejetz]

there actually has been a lensing event happen

and dude i love ur vids plz keep em coming iv told u to the whole science department in middle school about u

[LittleMissNoFace]

yet another brilliant video ^^

hope part three comes out soon.

[TheUnparagonedChris]

Another brilliant video, please keep them coming! Mind explaining what an explosion would look like in the vacuum of space?

[Adrenalx42]

@TheUnparagonedChris Probably just a flash of light because fire comes from oxidation and there is no oxygen in space

[DivineBeautyInc]

I think you need a video of you!

[ASKaPHYSICIST]

A video of me... what would that entail?

[cronauer1985]

all life is resornating on the same wave length. if we could change our wave length our perseption to life would change.dark matter is energy on the other wave cycle. hard to explaine.

[ASKaPHYSICIST]

glad you've got it all figured out.

[Adrenalx42]

@cronauer1985 Do you have any evidence of this? What kind of "wavelength" are you referring to? Sine? Cosine? If you can't explain it don't post it. Thats my philosophy.

[Akshayphadke]

amazing man

thnx keep them cming bro

[ASKaPHYSICIST]

will do, you're welcome bro.

[monkeysnatch1]

Once again Jan you have out done yourself in these amazing videos. I always look forward to your posts. Thanks for taking the time and effort for us all to enjoy on YouTube. I can only imagine how long your videos take to make.

[ASKaPHYSICIST]

2) I'm not sure I quite get the question, but I think the best the closest thing to seing single atoms is using an electron tunneling microscope.

4) I think it would still be blue due to the way the water reemits the light. However, without an atmosphere i.e. without any green house effect it might get very cold on earth. If the oceans froze, the earth would be white i guess.

[ASKaPHYSICIST]

5) well, there are trillions of stars, so the odds are life had to happen somewhere. In fact, I personally hope that life has developed in more than just one place.

But even if we are a single instance and the chances of life happening are infinitesimally small, if it didn't happen, we wouldn't be here to wonder about it.

[TheUFOeffect]

hey askaphysicst...what you you think about nassim haramein's swartzchild proton model.(unified field theory)

[ASKaPHYSICIST]

not sure what you are referring to. Could you send a link or something to my inbox?

[koolaidman007]

So would the matter of a MACHO actually be physically (as in by touching it) detectable?

[ASKaPHYSICIST]

Absolutely, they are effectively just like stars, just smaller and fainter. That is with the exception of black holes of course, but that's a whole new topic really.

[smawshot]

@ASKaPHYSICIST And what are the possibilities of black holes creating these sporadic pulls that we detect? With red-shift distancing falling to scrutiny are we still absolutely sure of the movements we are proclaiming?  And to answer yourboycal's 6th question. I think they are both wrong but still give us something to work with. Our observations and ability to formulate and predict events still provide a basis to move forward with .... such is the way their theories came to be.

[CountAlexander]

I understood most of this XD I feel so proud hehe

[yourboycal]

I would like to know

1) Why newtonion law and enstein realativity do not work together

2)When can we actually see an atom where its commercially available techonolgy so we can see past light waves etc

3)What is your view on possible techonolgy to achieve anti-gravity?

4) Whats earth look like without atmosphere?

5) All the thousands of factors needed for earth to have life , can this surly be chance and blind luck?

6)What if newton and enstein both got it wrong? where will we be?

[OriginalWolly]

@yourboycal

if Newton AND Einstein got it wrong then all of existence is a lie.

[TheUFOeffect]

@yourboycal my thoughts

1) idk

2) 50 years?

3) ask alienscientist for his torsion field antigravity work

4) it would be a rock and dust, no life

5) it could be bling luck H can fuse to make HE in stars. he's can fuse to make heavier and heavier atoms which can fuse again to make the elements of life C, H, and O.

6) if they were wrong we would probably know alot less physics and astronomy but relatively same amount ot chem bio, math and tech.

[yourboycal]

Ty for your thoughts :D <3

[jellygiraffe]

@yourboycal

for point number 5 I think you are looking at it the wrong way, with the billions of stars in the universe and potentially trillions of planets orbiting them there are bound to be a few that lie in the so called "goldylocks zone" we are on one of those planets. Its a matter of probability, I may not know a lot about physics, but working a casino, probability is my livelihood. Hope that helps. :)

[RafaelloCraiova]

can't wait for more!!! Wonderful!

[anime4evr2]

great work (y)

[DutchWarLordOfWar]

Another great video !