Dark matter clues in oldest stars


	Dark matter clues in oldest stars

bmman89

9-14-2007 1:30 PM

154 views

tags:

universe, dark matter

bmman89 says:

This is a great article about dark matter. It is amazing how much we don't know.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/059dc834-465d-4057-a0ca-e2adc4b665bc/827526CC-2091-4535-A678-63FEC0A82D31/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm" href="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm" style="font-size: 11px;">news.bbc.co.uk</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">A computer model of the early Universe indicates the first stars could have formed in spectacular, long filaments.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">These structures, which may have been thousands of light-years across, would have been shaped by "dark matter".</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">Astronomers believe that more than three-quarters of the matter in our Universe may be "dark".  It does not reflect or emit detectable light, and so cannot be seen directly - but it does gravitationally pull on normal matter (the gas, stars, and planets we see in space).</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">It is this interaction that allows scientists to predict its existence - even if they cannot say what it is.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">Computer modelling suggests there is a link between the structures assumed by early stars and the temperature of the dark matter amongst them.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm">Some of the stars that formed within the filaments would have had a relatively low mass, which is of interest to astronomers as they have a long lifespan and could still survive today.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.bbc.co.uk/2/hi/science/nature/6993870.stm"><IMG width="203" vspace="0" hspace="0" height="152" border="0" alt="Simulations of dark matter behaviour in the first forming stars" src="http://newsimg.bbc.co.uk/media/images/44115000/jpg/_44115117_star_science_203b.jpg" />
				<DIV class="cap">Simulation: With cold dark matter, structures become clumpy</DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/827526CC-2091-4535-A678-63FEC0A82D31/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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