hg321
Golden Member
- Oct 21, 2000
- 1,318
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silverpig
Lifer
- Jul 29, 2001
- 27,703
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Okay, so I'll try to answer some of the questions in this thread 
A long time. Hundreds of millions of years. Our galaxy is in the final stages of swallowing a dwarf galaxy right now, is currently absorbing a second dwarf galaxy (Saggitarius Dwarf I believe), and is also on a hundred million year long collision course with the Andromeda galaxy, one that is about the same size as our own.
Well some of it is, but not really. There were two competing theories of what dark matter could consist of, MACHOS and WIMPS. You are describing a MACHO (massive compact halo object). It's basically a large clump of cold matter like a brown dwarf or a rogue planet. Occasionally these chunks of matter will pass between us and a star and lens and/or block it out. Astronomers did a search where they looked up at the sky and looked for lensing events that would be characteristic of MACHOS. They did find some, but it was nowhere near what would be enough.
The current theory is that they are WIMPS (weakly interacting massive particles). They are subatomic particles which we have not detected yet due to the fact that they only couple to normal matter via gravitation and not via the usual strong/weak/em forces (or if they do, the reaction cross sections are extremely small). To get a better idea of how one would behave, imagine you had some special dark-matter holder glove and you grabbed a piece of it (it actually wouldn't condense into a piece, but whatever). Now you go up above the earth and drop the piece. It would fall towards the earth, pass right through it, and come out the other side. It'd then stop, and fall back through the earth back to you. The thing is, if it doesn't react with normal matter in the normal way, it's very difficult to detect; imagine trying to detect something that is both invisible and passes through everything you know.
If you're in a dark room and can't see, and you feel someone push you, you can still say that someone was there and they pushed you right?
Also I tend to agree with the idea that there won't be proof until we isolate and detect dark matter in a lab. However, even if we find out that the effects we see are due to something other than dark matter, you have to at least admit that whatever that something is, it sure as hell LOOKS like dark matter.
You don't need to know numbers in order to say what's larger than what. Obviously the big bang was the biggest release of energy ever. This is just the next largest that we have seen.
The same way a random person without an astrophysics degree can spout off on the internet now stupid the scientists are, except they actually know what they're talking about
A long time. Hundreds of millions of years. Our galaxy is in the final stages of swallowing a dwarf galaxy right now, is currently absorbing a second dwarf galaxy (Saggitarius Dwarf I believe), and is also on a hundred million year long collision course with the Andromeda galaxy, one that is about the same size as our own.
Well some of it is, but not really. There were two competing theories of what dark matter could consist of, MACHOS and WIMPS. You are describing a MACHO (massive compact halo object). It's basically a large clump of cold matter like a brown dwarf or a rogue planet. Occasionally these chunks of matter will pass between us and a star and lens and/or block it out. Astronomers did a search where they looked up at the sky and looked for lensing events that would be characteristic of MACHOS. They did find some, but it was nowhere near what would be enough.
The current theory is that they are WIMPS (weakly interacting massive particles). They are subatomic particles which we have not detected yet due to the fact that they only couple to normal matter via gravitation and not via the usual strong/weak/em forces (or if they do, the reaction cross sections are extremely small). To get a better idea of how one would behave, imagine you had some special dark-matter holder glove and you grabbed a piece of it (it actually wouldn't condense into a piece, but whatever). Now you go up above the earth and drop the piece. It would fall towards the earth, pass right through it, and come out the other side. It'd then stop, and fall back through the earth back to you. The thing is, if it doesn't react with normal matter in the normal way, it's very difficult to detect; imagine trying to detect something that is both invisible and passes through everything you know.
If you're in a dark room and can't see, and you feel someone push you, you can still say that someone was there and they pushed you right?
Also I tend to agree with the idea that there won't be proof until we isolate and detect dark matter in a lab. However, even if we find out that the effects we see are due to something other than dark matter, you have to at least admit that whatever that something is, it sure as hell LOOKS like dark matter.
You don't need to know numbers in order to say what's larger than what. Obviously the big bang was the biggest release of energy ever. This is just the next largest that we have seen.
The same way a random person without an astrophysics degree can spout off on the internet now stupid the scientists are, except they actually know what they're talking about
is "dark matter" the same thing as anti matter? because if it is then they already have produced anti matter in that famous particle accelerator in illinois
Jeff7
Lifer
- Jan 4, 2001
- 41,596
- 19
- 81
I still would like more time devoted to the theory that "dark matter" is merely the result of not taking relativity into effect when studying gravitational interactions. As I understand it, doing a computer simulation of a galaxy of billions of stars is only possible when Newtonian physics calculations are used, as the ones to take relatavistic effects into account are far too complex for today's computers to deal with in any reasonable amount of time. The discrepancy between Newtonian and Einsteinian (sp?) physics may amount to what we call "dark matter."
I think there was a thread on this in HT already several months ago, maybe longer than that, but I can't seem to find it anymore.
I think there was a thread on this in HT already several months ago, maybe longer than that, but I can't seem to find it anymore.
silverpig
Lifer
- Jul 29, 2001
- 27,703
- 11
- 81
Relativistic effects are too small even at a few km/s to account for the discrepancy. Besides, there are many other ways of detecting dark matter that don't rely on things moving. The proportions of dark matter, dark energy, matter, and radiation are found in the cosmic microwave background.
Jeff7
Lifer
- Jan 4, 2001
- 41,596
- 19
- 81
Ok, it was at another forum, that's why I couldn't find it here.
It was an article concerning the revolution of stars within a galaxy.
Abstract
Space.com article
It was an article concerning the revolution of stars within a galaxy.
Abstract
Space.com article
Originally posted by: SecretShadow
Originally posted by: KLin
Originally posted by: JS80
they're not sure what dark matter is yet they think they have proof of it?
Not only that, but they call this the largest release of energy since the big bang! I didn't know there was data on how much energy was released during the big bang.
How can someone with an IQ of probably over 140 and 10 years of schooling to become a massive scientist and study theory about dark matter make such a ridiculous claim? Scientists can sometimes be the dumbest people
Oh the irony...
This is pretty cool, I just with the article got more in depth on how they discovered this proof. It is so amazing to try and figure out how those "particles" behave.
Originally posted by: silverpig
Yeah, cause you're gonna be alive in 3 million years
Aren't you? I thoguht everyone would be.
Originally posted by: KLin
Not only that, but they call this the largest release of energy since the big bang! I didn't know there was data on how much energy was released during the big bang.
I held back a bit, so the girl was able to surive long enough to report how much energy was released during "the big bang".
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