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comment by tacocat

It's more like a mathematical outlier that scientists use to reconcile what really seems to make sense with what we see. I think most physicists were skeptical of it.

It's really just matter that doesn't emit light. Makes sense on paper. My eyes start to cross when they get into dark energy.

I've always been skeptical of it. But I'm an artist, not a scientist. You can tell me something makes the math work. That doesn't mean I understand what the fuck that means

Devac  ·  292 days ago  ·  link  ·  

    It's really just matter that doesn't emit light.

Oh, it's much funkier than that. It's not just lack of emission, it's the lack of any interaction between light and dark matter. There's no refractive index, no ability to reflect or absorb light, no known way for it to cast a shadow and (to my understanding) there's no effect similar to radiation pressure. You might as well forget about anything relating to (classical) optics when you are talking about dark matter.

I don't know about most physicists being sceptical, but IMO it's a very interesting concept, even if it would turn out that it's about as good as luminiferous aether.

tacocat  ·  292 days ago  ·  link  ·  

This matter doesn't behave normally?

Maybe not skeptical but more like this is very suspicious. Yeah. That sounds like skepticism. I don't speak for the scientific community. Disregard me. I sucks cocks.

Devac  ·  292 days ago  ·  link  ·  

    This matter doesn't behave normally?

If by 'normally' you mean 'like any other matter we interact with and detect directly on a daily basis', then no. Dark matter interacts gravitationally and we can observe this effect via indirect means. Weak gravitational lensing around galactic clusters is attributed to it. There are also attempts to work out how a collision of dark matter particles would work since it's not unreasonable to assume we could observe some of the resulting products.

Unfortunately, between it being unobservable directly through optical means and dozens of possible explanations of what dark matter is (or how to work around it), it's a very hard problem to reconcile. It's understandable to be suspicious of it, but time will tell. Hopefully it's gonna happen while we are still alive.

    Disregard me. I sucks cocks.

No. And there's no need to brag.

tacocat  ·  291 days ago  ·  link  ·  

But I didn't even say how good I can suck a cock...

kantos  ·  292 days ago  ·  link  ·  

The answer to the first question is yes and no from my fuzzy memory, but Devac and francopoli are both clearer and better informed. And together they give a kick-ass answer. As to skepticisms across communities...

Astronomy professors rave about how nutty it is that the only way we can measure it is through our understanding Newtonian mechanics alongside the implications.

Physics professors acknowledge it's existance for the same reason, then smile and shrug off preceding questions.

The lone math professor who deals with astronomy I talk to flat out calls the above lunatics.

I'd love to say that's how each community thinks, but I've got a small sample size.

EDIT: Left off the beginning of the last sentence.

francopoli  ·  292 days ago  ·  link  ·  

    Astronomy professors rave about how nutty it is that the only way we can measure it is through our understanding Newtonian mechanics alongside the implications.

Special Relativity, not Newton, but otherwise spot on. History is full of these "I have no idea on the why or how, but here is a bunch of math to describe and make predictions" when it comes to natural phenomena. Hell, speaking of Gravity, what is it? I mean Why is there Gravity? We understand DNA and evolution magnitudes more in depth than we do one of the four universal forces of the universe!

Devac  ·  291 days ago  ·  link  ·  


This is obviously just one of the more mainstream theories, but I found a very nice lecture series that tries to explain/ground concepts of loop quantum gravity. No maths but also no stock animations of vibrating strings. ;)


kantos  ·  290 days ago  ·  link  ·  

Hitting this up after Passover tonight. Fucking love TierZoo, in case I haven't said that enough.

Dala  ·  291 days ago  ·  link  ·  

I think you have just introduced me to my new favorite website. Thanks!

Devac  ·  291 days ago  ·  link  ·  

My pleasure! I'd also urge you to check out either of Brian Greene's Special Relativity courses they are hosting (there's one purely conceptual and one formal), even you if are already familiar with the material. It's hands down among the best lecture series in physics I watched and I strived to emulate some of his style in my own outreach work.

Dala  ·  290 days ago  ·  link  ·  

Everything they have looks like something I will enjoy, but I will make sure to put those high up in the queue!

kantos  ·  290 days ago  ·  link  ·  

Ahh, expecting to learn more about this next semester, but the survey course spoke related it all back to conservation of angular momentum to explain the confusion around why the galaxies' rotations don't add up.

tacocat  ·  291 days ago  ·  link  ·  

Gravity is a myth and we live on a flat disc accelerating upward. Check and mate

user-inactivated  ·  292 days ago  ·  link  ·  

One time one of my coworkers was just staring off into space. I asked them if they were okay and they just kept on staring, and said "I know it's a meme and all, but seriously, how do magnets work?"

francopoli  ·  292 days ago  ·  link  ·