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Author Topic: Dark matter found  (Read 8771 times)
Ivan Ivanov
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Dark matter found
« on: August 25, 2006, 11:52:25 am »

http://www.sciencedaily.com/releases/2006/08/060821133930.htm

Scientists invent "Dark Energy" and "Dark Matter", because they cannot come up with a good explanation for the data their probes collect and are too dumb and lazy to try and prove/disprove anything.

You were saying something Deus? Wink
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Deus Siddis
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Re: Dark matter found
« Reply #1 on: August 25, 2006, 02:35:06 pm »

I'm not sure I understand that this is "direct proof" Dark Matter is out there, and meets the definition that has been made for it. It sounds like their calculations are off (perhaps because these collision-ers are so distant and so it is just an educated guess what they are made of,) or some unknown force is at work over there. Perhaps its actually Dark Energy, Zero Point Energy, Prauna, The Force, the Uhl, Alien gas miners, etc. Smiley

There's two things from the article that seemed weird to me:

"dark matter, which is invisible and can only be detected through its gravity"

"the dark matter was not slowed by the impact, because it does not interact directly with itself or the gas except through gravity."

This doesn't sound a lot like dark "matter" to me. But if it is, that last quote proves it is really "Dwarf" Dark Matter! :p
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Death 999
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Re: Dark matter found
« Reply #2 on: August 25, 2006, 04:06:30 pm »

Matter is stuff which weighs something even when it is stopped. In other words, it moves slower than the speed of light.

If there is matter which does not have a significant coupling to the electromagnetic, weak, or Strong fields, then it would be nearly interactionless.
This is not at all farfetched -- Neutrons do not have much coupling to the electromagnetic field. Electrons do not have any coupling to the strong field at all. Neutrinos are only coupled to the weak field.

So, it's reasonable to suppose that there is something else which isn't coupled to any of the above. But it would still weigh something.
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Deus Siddis
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Re: Dark matter found
« Reply #3 on: August 26, 2006, 03:40:41 pm »

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Matter is stuff which weighs something even when it is stopped.

I thought weight was more about how something was effected by gravity or something along those lines, and mass was what stopped matter from ever being able to exceed the speed of light. I didn't know that anything that didn't have one of these two things necessarily had to move at or faster than the speed of light, though either.


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This is not at all farfetched -- Neutrons do not have much coupling to the electromagnetic field. Electrons do not have any coupling to the strong field at all. Neutrinos are only coupled to the weak field.

But does this mean Dark Matter would be completely uneffected by interactions with light and itself/matter?
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Death 999
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Re: Dark matter found
« Reply #4 on: August 27, 2006, 07:00:41 pm »

On mass vs weight you are correct that there is a difference. However, anything with mass will weigh something, so it works out the same in this case.

Anything with no mass can have no energy unless it is moving at the speed of light, exactly (e.g. photons). A weak exception is granted for particles with extremely short lifetimes (e.g. gluons), as the mass of a particle is constrained to its nominal mass only via resonance. If the particle doesn't last long enough for the resonance to really knock off all the other masses, then it can have a different mass than its nominal mass.


Dark matter would  be coupled via gravity at least; there could also be very weak couplings. Like, if they occupy a fourth 'generation' of quarks, they would undergo normal forces, but just not much with our kind of matter. If they are supersymmetric partners, or are nucleonic axions, then they could undergo normal forces with ordinary matter, but only at such high energies that we haven't been able to probe it yet.
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Re: Dark matter found
« Reply #5 on: August 28, 2006, 04:42:17 pm »

I suppose black suns can exist as well then ...
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Re: Dark matter found
« Reply #6 on: August 28, 2006, 07:28:17 pm »

They prefer African American suns.
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Re: Dark matter found
« Reply #7 on: August 28, 2006, 08:20:17 pm »

I thought it was 'pigmentally enhanced suns'  Wink
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Death 999
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Re: Dark matter found
« Reply #8 on: August 29, 2006, 04:37:20 pm »

Our sun is quite typical in that it is black; any other kind of star would be anomalous to the point that it would require new physical theories to explain.

If you're wondering what I'm smoking, keep in mind that black is the condition of having an emissivity of 1 across the spectrum. If the other object is cool, it will appear dark. If the object is hot, it will appear bright.

So, when iron begins to glow red, a physicist would say that it remains black.
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Re: Dark matter found
« Reply #9 on: August 30, 2006, 06:35:57 pm »

Hey that's that "black body radiation" I heard about. Never quite figured it out. Why the "black" in the name?
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Ivan Ivanov
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Re: Dark matter found
« Reply #10 on: August 30, 2006, 07:12:59 pm »

Hey that's that "black body radiation" I heard about. Never quite figured it out. Why the "black" in the name?

Because it doesn't reflect any light?
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Re: Dark matter found
« Reply #11 on: August 31, 2006, 04:04:07 pm »

Black is the color which absorbs all light, right?

Well, the universe (more or less) has time-reversal symmetry. What's the reverse of absorbing light? Emitting light!

So, black objects are also the best at emitting light.

We do not normally see this because almost everything we see does not emit light itself (at least, not thermally), but instead reflects it. In order for us to see the emitted light of an object, it would have to be hot enough to emit in the visible spectrum, which begins around 500 celsius (around 1000 fahrenheit).
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Re: Dark matter found
« Reply #12 on: September 02, 2006, 05:01:55 am »

Yeah, I haven't posted in, like, forever. but thats not the point.

Anyway, Dark matter is a misnomer. You see, Scientists don't quite understand that light travels faster away from gravity wells, such as planets, stars, and UrQuan Dreadnaughts.
When  taken into account, these pockets of dark matter seem to dissapear

Its just ignorence, really.
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Death 999
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Re: Dark matter found
« Reply #13 on: September 04, 2006, 02:16:15 pm »

WTF? Scientists don't understand the rules that... scientists... made... oh, wait, that doesn't make any sense at all.

So, do you care to explain the way that galaxies are suspiciously failing to fly apart under ther internal momentum, which is what Dark Matter's job is, mainly
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Deus Siddis
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Re: Dark matter found
« Reply #14 on: September 04, 2006, 06:30:12 pm »

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Scientists don't understand the rules that... scientists... made... oh, wait, that doesn't make any sense at all.

So then scientists have a collective consciousness? Thought scientists often disagreed on many theories' accuracies, I did.


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So, do you care to explain the way that galaxies are suspiciously failing to fly apart under ther internal momentum,

I thought that super massive black holes were responsible for keeping galaxies together?


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which is what Dark Matter's job is, mainly

It got layed off, black holes will do the same job for half the pay. Wink
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