<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://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/8115d5b1-2849-4f06-b3c4-2fef79b7dadd/0F0C7955-6E8C-42C5-8EDB-4305AEA8D429/" 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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html" href="http://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html" style="font-size: 11px;">www.telegraph.co.uk</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><H2>Unseen "dark" comets could pose a deadly threat to earth, astronomers have warned. </H2></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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.telegraph.co.uk/img/C8760A3D-BB23-4007-B4A9-E64E29BB66EF" alt="Comet: Unseen dark comets 'could pose deadly threat to earth' " /></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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> The comets, of which there could be thousands, are not currently monitored by observatories and space agencies. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> Most comets and asteroids are monitored in case they start to travel towards earth. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> But Bill Napier, from Cardiff University, said that many could be going by unnoticed. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> "There is a case to be made that dark, dormant comets are a significant but largely unseen hazard," he said </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> Scientists estimate that there should be around 3,000 comets in the galaxy, but only 25 have so far been identified. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> "Dark" comets happen when the water on their surface has evaporated, causing them to reflect less light. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> Astronomers have previously spotted comets heading towards earth just days before they passed. </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://www.telegraph.co.uk/scienceandtechnology/science/space/4592130/Unseen-dark-comets-could-pose-deadly-threat-to-earth.html"><P> In 1983 a comet called IRAS-Araki-Alcock passed at a distance of just 5 million kilometres, the closest of any comet for 200 years, but it was noticed just a fortnight beforehand. </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/0F0C7955-6E8C-42C5-8EDB-4305AEA8D429/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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