Galaxy without dark matter puzzles astronomers


	Galaxy without dark matter puzzles astronomers

tabsey

2-6-2008 4:43 AM

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tags:

astronomy

tabsey says:

Interesting article if you enjoy the mysteries of astronomy.

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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/580194f8-57e2-486e-bb9c-018420d5b7b0/1CB6EA80-8DD6-432F-B6CC-35DF1A73B651/" 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://space.newscientist.com/article/dn13280-galaxy-without-dark-matter-puzzles-astronomers.html?feedId=online-news_rss20" href="http://space.newscientist.com/article/dn13280-galaxy-without-dark-matter-puzzles-astronomers.html?feedId=online-news_rss20" style="font-size: 11px;">space.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://space.newscientist.com/article/dn13280-galaxy-without-dark-matter-puzzles-astronomers.html?feedId=online-news_rss20"><DIV class="rhbx">
<A target="nsimage" href="http://space.newscientist.com/data/images/ns/cms/dn13280/dn13280-1_600.jpg"><IMG width="250" title="The spiral galaxy NGC 4736, which lies 15 million light years from Earth, does not need dark matter to explain the motion of its stars and gas, according to a new study (Image: David W Hogg/ Michael R Blanton/SDSS Collaboration)" alt="The spiral galaxy NGC 4736, which lies 15 million light years from Earth, does not need dark matter to explain the motion of its stars and gas, according to a new study (Image: David W Hogg/ Michael R Blanton/SDSS Collaboration)" src="http://space.newscientist.com/data/images/ns/cms/dn13280/dn13280-1_250.jpg" /></A>
                 <DIV class="enlarge straptext"><SPAN><A target="nsimage" href="http://space.newscientist.com/data/images/ns/cms/dn13280/dn13280-1_600.jpg">Enlarge image</A></SPAN></DIV>
<DIV class="straptext">The spiral galaxy NGC 4736, which lies 15 million light years from Earth, does not need dark matter to explain the motion of its stars and gas, according to a new study (Image: David W Hogg/ Michael R Blanton/SDSS Collaboration)</DIV>
        </DIV></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://space.newscientist.com/article/dn13280-galaxy-without-dark-matter-puzzles-astronomers.html?feedId=online-news_rss20"><P>What do you call an absence of darkness? Dark matter is supposed to be spread throughout the universe, but a new study reports a spiral galaxy that seems to be empty of the stuff, and astrophysicists cannot easily explain why.</P></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://space.newscientist.com/article/dn13280-galaxy-without-dark-matter-puzzles-astronomers.html?feedId=online-news_rss20"><P>In the outer regions of most galaxies, stars orbit around the centre so fast that they should fly away. The combined mass of all the observable inner stars and gas does not exert strong enough gravity to hold onto these speeding outliers, suggesting some mass is missing.</P></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/1CB6EA80-8DD6-432F-B6CC-35DF1A73B651/blog/" title="blog or email this clip"><img src="http://content7.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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