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Date: 18 Sep 2007 21:41:42
From: Sitav
Subject: i am so behind in the world of astronomy
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i know that this is an amatuer astronomy group and maybe my age is to
blame but i sincerely think that i'm just stupid because i can't keep
up with the latest news. i mean its not that hard, i'm just lazy.
anyway this year i plan to do a presentation on dr. neil de grasse
tyson and luckily my librarian knows so it would be so cool if he
could come to the presentation. anyway i have a lot of research to do
and any news on dark matter and dark energy?
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Date: 19 Sep 2007 03:54:10
From: Sam Wormley
Subject: Re: i am so behind in the world of astronomy
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Sitav wrote:
> i know that this is an amatuer astronomy group and maybe my age is to
> blame but i sincerely think that i'm just stupid because i can't keep
> up with the latest news. i mean its not that hard, i'm just lazy.
> anyway this year i plan to do a presentation on dr. neil de grasse
> tyson and luckily my librarian knows so it would be so cool if he
> could come to the presentation. anyway i have a lot of research to do
> and any news on dark matter and dark energy?
>
Some refresher Sitav...
Background on Dark Matter
http://en.wikipedia.org/wiki/Dark_matter
Background on Dark Energy
http://en.wikipedia.org/wiki/Dark_energy
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Date: 18 Sep 2007 23:22:46
From: Sam Wormley
Subject: Re: i am so behind in the world of astronomy
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Sitav wrote:
> i know that this is an amatuer astronomy group and maybe my age is to
> blame but i sincerely think that i'm just stupid because i can't keep
> up with the latest news. i mean its not that hard, i'm just lazy.
> anyway this year i plan to do a presentation on dr. neil de grasse
> tyson and luckily my librarian knows so it would be so cool if he
> could come to the presentation. anyway i have a lot of research to do
> and any news on dark matter and dark energy?
>
Stringy 'filaments' could have produced first stars
http://physicsworld.com/cws/article/news/31133
The way in which stars, galaxies and other cosmic structures
originally formed depends strongly on the nature of dark matter,
claim physicists in the UK and Belgium. By simulating the early
effects of "warm" dark matter, which some researchers consider the
most likely form of dark matter, the researchers found that the first
stars would have been produced in massive "filaments" of dense gas --
thus going against physicists' conventional view of star formation
(Science 317 1527).
As yet undiscovered, dark matter is thought to exist because galaxies
seem to be held together by the gravitational attraction of much more
mass than we can see through telescopes. Dark-matter particles could
be "hot", meaning that they are light and fast, although simulations
suggest that hot dark matter would not explain how cosmic structure
formed after the Big Bang. Most physicists therefore think "cold" or
slower-moving particles are more likely because they do a better job
of accounting for the universe's evolution. But cold dark matter
appears to be at odds with the observed densities of certain
sub-galactic structures.
See: http://physicsworld.com/cws/article/news/31133
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Date: 18 Sep 2007 21:45:24
From: Sitav
Subject: Re: i am so behind in the world of astronomy
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On Sep 18, 5:41 pm, Sitav <sitav_n...@yahoo.com > wrote:
> i know that this is an amatuer astronomy group and maybe my age is to
> blame but i sincerely think that i'm just stupid because i can't keep
> up with the latest news. i mean its not that hard, i'm just lazy.
> anyway this year i plan to do a presentation on dr. neil de grasse
> tyson and luckily my librarian knows so it would be so cool if he
> could come to the presentation. anyway i have a lot of research to do
> and any news on dark matter and dark energy?
TYPO!! My librarian knows neil de grasse tyson =]
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