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Dark matter Galaxy discovered

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Skeletron

Member

Citing physicists' understanding of the standard model, Feng speculated that there may also be a separate dark sector with its own matter and forces. "It's possible that these two sectors talk to each other and interact with one another through somewhat veiled but fundamental interactions," he said. "This dark sector force may manifest itself as this protophobic force we're seeing as a result of the Hungarian experiment. In a broader sense, it fits in with our original research to understand the nature of dark matter."
Bro....bro...the Upside Down exists. WTFFFF
 

Ishan

Junior Member
Nope. Its just super empty and shouldn't be there.


You see on huge scales the universe should be basically the same in all directions. But it isnt. Thats not even counting dark flow.

Wasn't dark flow disproved ? Or at least reclassified etc
 

charsace

Member
Sounds like the start of a sci-fi horror novel.

"Man's hunger to touch the stars has just lead to its downfall...

A group of young scientists make an unbelievable discovery; a galaxy made up almost entirely of black matter. And it has noticed. It has been in a lucid sleep, wrapped up in dark waste it has left behind. And they have done enough for it to turn an eye towards us. It has lived for 25 galactic years, and it hungers. It hungers to not be alone. It hungers for friendship and companionship. Like always this hunger will lead it to consume. We will discover why that section of the galaxy has gone dark.

The young scientists will stand face to face with our end. What they accidentally started no one will be able to stop."

Someone could write a good story based around this.
 

GaimeGuy

Volunteer Deputy Campaign Director, Obama for America '16
Dark Matter and Dark Energy are called as such, iirc, because they do not exert or otherwise interact with the electromagnetic spectrum. It's generally held that the strong and electromagnetic forces are absent; only the weak force and gravity occur.
 

Noirulus

Member
Woah, that's really interesting. I wonder if it's still forms a spiral or elliptical shape despite such little amount of stars?
 
Its always humbling to think that everything we see and know makes up virtually nothing of the actual universe

Xveevjl.jpg


On the other hand, I also sometimes wonder if we really are missing out on something simple and critical, like we are making more and more convoluted explanations why most of the universe is made up of stuff we can't see or interact with but only can infer from how it affects everything else.
 

BorkBork

The Legend of BorkBork: BorkBorkity Borking
Its always humbling to think that everything we see and know makes up virtually nothing of the actual universe

Xveevjl.jpg


On the other hand, I also sometimes wonder if we really are missing out on something simple and critical, like we are making more and more convoluted explanations why most of the universe is made up of stuff we can't see or interact with but only can infer from how it affects everything else.

Yeah went to a talk at the local space center where he talked about this. It's crazy.
 

Skinpop

Member
Its always humbling to think that everything we see and know makes up virtually nothing of the actual universe

Xveevjl.jpg


On the other hand, I also sometimes wonder if we really are missing out on something simple and critical, like we are making more and more convoluted explanations why most of the universe is made up of stuff we can't see or interact with but only can infer from how it affects everything else.

most of the simple stuff has been ruled out. also we already know of a sort of dark matter: neutrinos, so it's not that out there.
 

dabig2

Member
I've always been a bit skeptical about dark matter but this very interesting. The article doesn't go into any detail on how exactly they determined the mass of this thing.

Don't know if it's been answered yet, but they largely determine mass based on the velocity of stars they observe:

http://www.dailygalaxy.com/my_weblog/2016/08/exciting-new-discovery-milky-way-sized-blob-galaxy-made-entirely-of-dark-matter-we-have-no-idea-who-.html#more
[...]
Van Dokkum’s team was able to get a good look at Dragonfly 44 thanks to the W.M. Keck Observatory and the Gemini North telescope (below), both in Hawaii. Astronomers used observations from Keck, taken over six nights, to measure the velocities of stars in the galaxy. They used the 8-meter Gemini North telescope to reveal a halo of spherical clusters of stars around the galaxy’s core, similar to the halo that surrounds our Milky Way galaxy.

Star velocities are an indication of the galaxy’s mass, the researchers noted. The faster the stars move, the more mass its galaxy will have.

“Amazingly, the stars move at velocities that are far greater than expected for such a dim galaxy. It means that Dragonfly 44 has a huge amount of unseen mass,” said co-author Roberto Abraham of the University of Toronto.


Scientists initially spotted Dragonfly 44 with the Dragonfly Telephoto Array, a telescope invented and built by van Dokkum and Abraham.

The image below shows the dark galaxy Dragonfly 44. The image on the left is from the Sloan Digital Sky Survey. Only a faint smudge is visible. The image on the right is a long exposure with the Gemini telescope, revealing a large, elongated object. Dragonfly 44 is very faint for its mass and consists almost entirely of dark matter. (Images by Pieter van Dokkum, Roberto Abraham, Gemini, Sloan Digital Sky Survey)
[...]
 

MogCakes

Member
So dark matter bends light via gravity but does not absorb, reflect, or...refract. Hm. A bit difficult to wrap my head around gravitational bending but not refraction. So it's literally invisible save for gravitational effects and this extends to light. I'm usually pretty good with getting stuff but this will require some mulling over.
 
So would this Galaxy essentially be invisible? Sorry I'm not up to date on the latest Dark Matter stuff, but most of what I've read is we essentially don't have any clue on what it actually is
 

dabig2

Member
So would this Galaxy essentially be invisible? Sorry I'm not up to date on the latest Dark Matter stuff, but most of what I've read is we essentially don't have any clue on what it actually is

It's faint, but not invisible. After all, it's 300 million LY away and we can take pictures of it. It's just that it's really sparsely populated for its mass and so we have to look extra hard for it. If that galaxy had the proportional amount of stars in it that other galaxies (like our own) do for its mass, we probably would have discovered it decades ago.
 
Sounds like the start of a sci-fi horror novel.

"Man's hunger to touch the stars has just lead to its downfall...

A group of young scientists make an unbelievable discovery; a galaxy made up almost entirely of black matter. And it has noticed. It has been in a lucid sleep, wrapped up in dark waste it has left behind. And they have done enough for it to turn an eye towards us. It has lived for 25 galactic years, and it hungers. It hungers to not be alone. It hungers for friendship and companionship. Like always this hunger will lead it to consume. We will discover why that section of the galaxy has gone dark.

The young scientists will stand face to face with our end. What they accidentally started no one will be able to stop."

Someone could write a good story based around this.

Then why the hell did you stop? That post alone had me hooked, I wanna read more!!!

OT: this is pretty nuts. Man I love space!!
 

Stinkles

Clothed, sober, cooperative
Its always humbling to think that everything we see and know makes up virtually nothing of the actual universe

Xveevjl.jpg


On the other hand, I also sometimes wonder if we really are missing out on something simple and critical, like we are making more and more convoluted explanations why most of the universe is made up of stuff we can't see or interact with but only can infer from how it affects everything else.

The cool thing about this pie chart (if you make a couple of baseless but reasonable assumptions) is that it makes the Fermi paradox collapse a little and makes us citizens of the rare "light universe"
 
99.99 of this galaxy is made up of dark matter...

Which space itself is believed to be made up of dark matter. In other words, it's almost an empty shell of a galaxy with a 1% of a star(s) possibly currently existing.
 

DevilDog

Member
I've studied this in my university and I'm still having troubles comprehending it.
But this means that these galaxies can exist closer to us right?

I can hear the sci-fi writers tears of joy. Can't wait


I'm not sure a game has ever managed to hype me up quite as much as the last hour or so of Mass Effect 2.
Real shame about the sequel, though.

At the end of ME1: The reapers are real, and I'm not going to do anything to stop them in the next 2 years.

The ending of ME2 was a disaster. That whole story was a disaster.

3 had a better one at least. Whatever if could salvage from 2's wreckage.
 

BizzyBum

Member
Dark Matter is probably just some code or algorithm to keep the universe running efficiently, though in instances like this it can get buggy.

Ya know, since we're living in a simulated universe, and all...
 
99.99 of this galaxy is made up of dark matter...

Which space itself is believed to be made up of dark matter. In other words, it's almost an empty shell of a galaxy with a 1% of a star(s) possibly currently existing.
I'm not sure if I follow what you're saying, but you might be mixing up dark matter and dark energy?
 

M3d10n

Member
What if the space there was bent for so long it stayed that way even after the stars were consumed? Like an old tent sheet.
 
We've already calculated the ratio of dark matter to known matter based on the speed at which the universe expends, so this particular observation changes very little.

Calculating the mass of far away galaxies is pretty tricky.
What makes dark matter evident is usually that several stars orbiting around a cluster move at the same speed whereas the ones closer to the center of mass should move faster, like Mercury moves faster than Pluto. This means that what ever dark matter is, it's distributed within that cluster, like Mercury would move slower if it was orbiting within the sun.
 

Easy_D

never left the stone age
I wonder if the universe gets crazier/different further out from us. Like, if it was like a layered cake, and we're in some pretty boring part of it

It's only boring to us, odds are we're in the crazy part

Edit: Not even odds, it's confirmed :lol.
 
Dark Matter and Dark Energy are called as such, iirc, because they do not exert or otherwise interact with the electromagnetic spectrum. It's generally held that the strong and electromagnetic forces are absent; only the weak force and gravity occur.

Don't you mean weak force and emf interaction are absent? I thought they were unified now.

Theoretically, could dark matter have its own force which "light" matter does not interact with? If there is, I could see intelligence potentially developing in the "dark" system.

I can't see life, as an information storage medium, evolving just with gravity (mass-based attraction) and strong force (intranuclear attraction). Most natural information storage and retrieval (DNA, protein folding, neurology) is driven by electromagnetism in one form or another.
 
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