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Thread: Dark Matter

  1. #1 Dark Matter 
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    I've seen dark matter on many threads, and I've felt as though I'm not qualified to respond since I'm not exactly sure what it is. Could someone explain it to me? Please excuse me for being in the dark here (excuse the pun).


    It's not that I'm smarter than everybody else, it's just that I stick with problems longer. -Albert Einstein
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    Here's a good place to start: Dark matter - Wikipedia, the free encyclopedia

    Dark matter is a type of matter hypothesized in astronomy and cosmology to account for a large part of the mass that appears to be missing from the universe. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level. It is otherwise hypothesized to simply be matter that is not reactant to light.[1] Instead, the existence and properties of dark matter are inferred from its gravitational effects on visible matter, radiation, and the large-scale structure of the universe. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the known universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy.[2][3] Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe, while dark energy plus dark matter constitute 95.1% of the total content of the universe.[


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    Why didn't you just do a simple google search rather than starting a whole thread about that
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    Quote Originally Posted by YellowKazooie View Post
    Why didn't you just do a simple google search rather than starting a whole thread about that
    Or he could be like you and post nonsensical smart-a$$ responses in other people's threads.
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  6. #5  
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    sometimes a thread can give you information a google search can't
    It's not that I'm smarter than everybody else, it's just that I stick with problems longer. -Albert Einstein
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    Sabodriver, ask away -- don't mind the yellow kazooie -- he just came off suspension and is probably a little POed..
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    thanks
    It's not that I'm smarter than everybody else, it's just that I stick with problems longer. -Albert Einstein
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  9. #8  
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    sabodriver17, that yellow kazooie character was just suspended again. So, just forget he ever posted and ask away . . . .
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    Quote Originally Posted by sabodriver17 View Post
    I've seen dark matter on many threads, and I've felt as though I'm not qualified to respond since I'm not exactly sure what it is. Could someone explain it to me? Please excuse me for being in the dark here (excuse the pun).
    Back in the 1940s, while everyone else was having World War 2, Fritz Zwicky got most of the time on the 200-inch telescope at Palomar, near Los Angeles in Southern California USA. He had the time, as a result, to measure the rotations of a lot of galaxies by spectroscopy (by Doppler shifts in the spectra of many stars). What he found was that almost all galaxies rotated not as if the bright, visible matter in them were all there was, but as if they had huge, invisible rings of dark matter mixed deeply down toward their centers, that extended to single digit integers times their observable diameter. So less than ten times, but more than two or three times as big as the visible matter.

    This was known for a while as "Zwicky objects" or "Zwicky matter," but after all the scientists came back from whatever they'd been doing in WWII (Manhattan Project, some of them), they started looking into this and found that there was a huge missing mass problem in almost every galaxy they could see. The rotation curves simply didn't match the distribution of the matter if only bright, visible matter was taken into account.

    Much more evidence has been accumulated since, but it is important that you understand that this original evidence from the 1940s has never been contradicted in a credible science article.
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    Quote Originally Posted by sabodriver17 View Post
    sometimes a thread can give you information a google search can't
    google indexes forum posts as well, you idiot.
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    Quote Originally Posted by YellowKazooie2 View Post
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    Pull your socks up, lad.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by YellowKazooie2 View Post
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    Pull your socks up, lad.
    I am a sock puppet, so what?
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    Quote Originally Posted by YellowKazooie2 View Post
    I am a sock puppet, so what?
    Sadly, it means you won't be around for long. We shall miss your charm, erudition and wit.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by YellowKazooie2 View Post
    I am a sock puppet, so what?
    Sadly, it means you won't be around for long. We shall miss your charm, erudition and wit.
    as if I need you losers. Look at you, you've got 14k posts in a forum about science. go get a life
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    Oh the irony of someone who created not one but two accounts purely for the purpose of trolling saying we need to get a life...
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  17. #16  
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    Quote Originally Posted by YellowKazooie2 View Post
    Quote Originally Posted by Strange View Post
    Quote Originally Posted by YellowKazooie2 View Post
    I am a sock puppet, so what?
    Sadly, it means you won't be around for long. We shall miss your charm, erudition and wit.
    as if I need you losers. Look at you, you've got 14k posts in a forum about science. go get a life
    Can he have yours? You're obviously not using it.
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