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User avatar #62 - Bion ONLINE (02/01/2013) [-]
If anyone is interested, Dark Matter is actually a.. "substance" that doesn't really exist... or kind of does maybe.

Dark Matter is actually a theory. It's a type of "energy" that holds galaxies together, rather than having them spinning off, as the gravitational pull of each planet/stars/etc aren't enough to keep galaxies together. They do theoretic tests that show how the galaxies should expand and retract, with their relative mass. And... they don't retract. They have to add in a source of "energy" that defies typical physics, and doing so makes the tests stable and play out like they should.

At least, that is what I had learned about it, a couple years ago. My memory might have been warped from what it was, or the theory may have changed, since then.
#178 to #62 - jakeattack (02/01/2013) [-]
WELLLL what you are thinking of is dark energy. dark matter however has actual effects that are seen. its gravitational lensing , or the gravity of an invisible object bending light, yet we see nothing.
User avatar #120 to #62 - vishnarg ONLINE (02/01/2013) [-]
tl:dr; dark matter and matter ate each other up and dueled it out at the beginning of time and matter one out, but now we have ridiculous amounts of nothingness in between. Dark matter now is very scarce.
User avatar #86 to #62 - rammed (02/01/2013) [-]
"that doesn't really exist... or kind of does maybe"

all of theoretical physics in a nutshell
User avatar #87 to #86 - Bion ONLINE (02/01/2013) [-]
Yeah. I tried to throw in a bit of humor. It WAS intended.
#73 to #62 - anonymous (02/01/2013) [-]
This is actually pretty accurate, but what you're describing is actually what's known as dark energy. Dark matter is a similar theory that states that there are certain parts of far-off galaxies where stars cluster closer together than they should be given their mass. Their collective gravity shouldn't be strong enough to hold the system as close together as it is.

Essentially, scientists have reasoned that the only way for it to make sense within the bounds of physics is for there to be excessively large amounts of matter floating around in space that doesn't produce light and we haven't learned how to "see" or detect yet. The phenomenon is observed commonly enough that on the spectrum of space theories, it's far closer to black holes than it is to worm holes.
User avatar #81 to #73 - Bion ONLINE (02/01/2013) [-]
Yeah, figured that out already. Memory warped the matter and energy, I guess.

Still very similar theories, in the end.
User avatar #92 to #81 - srskate (02/01/2013) [-]
I was almost certain that dark energy is the opposite of dark matter. It tries to spread out galaxies, which accounts for the accelerated rate of expansion of the universe.
User avatar #97 to #92 - Bion ONLINE (02/01/2013) [-]
First: The universe isn't accelerating, it's slowing down. Which signifies that the "Big Bang" is a repeated cycle that happens every... bajillion years. It will eventually stop expanding, begin to retract, and eventually compact, and eventually cause another "Big Bang".

Second: Galaxies without dark energy will have it's planets and stars and stuff fly everywhere in very unexpected ways. If gravity was the only thing holding a galaxy together, the gravity of each planet and star would pull each of them in different ways, causing the chaotic positioning.

Something about the Dark Energy (either it's unknown, or it's just unknown to me), keeps the pieces of the galaxy from spreading out in such chaos. And instead, in sync with the gravitational pull, causes the pieces to fall into place more evenly. Spiral galaxies are a prime example of this, as without the Dark Energy, it would just be a *********** of stars, planets, and such, just crashing into each other, and expanding away from the focal point.
User avatar #101 to #97 - srskate (02/01/2013) [-]
wikipedia disagrees, as does nasa. At least on that bit about what dark energy does. I know all galaxies have an abundance of dark matter at their core, holding them together.
en.wikipedia.org/wiki/Dark_energy
science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/
User avatar #104 to #101 - Bion ONLINE (02/01/2013) [-]
Maybe I'm just getting stuff mixed up then. In which case I'm just spouting nonsense, and feel free to ignore me.
#109 to #104 - srskate (02/01/2013) [-]
No prob, physics gets confusing sometimes
No prob, physics gets confusing sometimes
User avatar #167 to #109 - Bion ONLINE (02/01/2013) [-]
Well, I was right. But I was told that I was wrong. So I started speaking what I was told was right, when it was really wrong.

Long story short, I was right about Dark Matter holding the galaxies together, I took someone's word saying it was actually Dark Energy, and without checking evidence, started to say it was in fact Dark Energy. Thus I feel slightly idiotic, and a bit gullible for that.
User avatar #145 to #109 - Bion ONLINE (02/01/2013) [-]
Dunno why your links got thumbed down. You actually took the time to look stuff up, and I'm just rambling from memory. Oh well. I threw a green thumb in there to try and even it out.
#67 to #62 - zgbgydug (02/01/2013) [-]
Dark matter and dark energy are different
User avatar #165 to #67 - Bion ONLINE (02/01/2013) [-]
You, sir...

After jumping into a bit of research, it apears that it IS the Dark Matter that holds the galaxies together.

Perhaps you thought I was talking about Dark Energy just because I used the term "energy"?
#288 to #165 - zgbgydug (02/01/2013) [-]
I thought you were assuming that dark matter and dark energy were the same because of how you used matter and energy in the same way.

If I'm not mistaken, and someone correct me if I am, I believe it is
-dark matter that creates gravitational forces larger than expected (ie. Galaxies being held together)
-dark energy that causes the universe to expand at a more rapid rate over time instead of slowing down

I love science.<3
User avatar #289 to #288 - Bion ONLINE (02/01/2013) [-]
Yes. That's the way it is. Haha. I was describing Dark Matter as an "Energy" because it's almost.. not even there. It's like nothing, that has a gravitational pull.

But yeah, you then made me start telling people that Dark Energy is what Dark Matter is xD

Which is ironically, what a lot of people are saying, wrongly.
#72 to #67 - kingultra (02/01/2013) [-]
I thought dark matter was a term for unexplained but real things in space
User avatar #71 to #67 - Bion ONLINE (02/01/2013) [-]
Hmm... You're right. But a quick research shows how closely related they are...

And at first glance, they look to be the exact same thing, just one being physical and one not.

If I wasn't tired as **** , I'd read more about this. I find it interesting.
#76 to #71 - zgbgydug (02/01/2013) [-]
Sorry for the blunt response, I'm also tired and didn't feel like remembering everything I know about them so I left it at that. You should look into this and other science related.. things.. It's all interesting.

Except biology.

**** biology.
#79 to #76 - sickedy (02/01/2013) [-]
" **** biology"
...
gigity
User avatar #78 to #76 - Bion ONLINE (02/01/2013) [-]
I like all things that are science-y.

Even Bio. Chemistry I only like the basics, and physics is prolly more work than it's worth to solve.

But space and earth sciences are extremely interesting. I made some posts a long ass time ago about history repeating itself over and over again. If i wasn't lazy, I'd dig it all up. If I wasn't doubly lazy, I'd just type it all back out.
User avatar #142 to #78 - hammarhead (02/01/2013) [-]
Biology, **** yeah. I didn't have fun until i realized how interconnected everything was in science. everything is applicable to everything.
User avatar #163 to #142 - Bion ONLINE (02/01/2013) [-]
Biology is also really easy to follow, compared to the other sciences. That's what makes it so "fun" for me. It's just simple and easy, and easy to remember (for the most part). At the same time, when you get far, far into it, it is extremely complex... I wonder...

Which is more limitless... The universe, or the human mind?
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