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Death from across the galaxy
amgumen
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13
4-20-2007 11:56 AM
803 views
tags:
climate change
,
disasters
,
environment
,
geology
,
science
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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://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/a9da30ce-b2dd-4889-8c42-e5feca181117/133FEB3C-0ABD-42FC-AA71-4DCED5AD6A60/" 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.world-science.net/exclusives/070226_grb-life.htm" href="http://www.world-science.net/exclusives/070226_grb-life.htm" style="font-size: 11px;">www.world-science.net</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.world-science.net/exclusives/070226_grb-life.htm">Recently, gamma-ray bursts were recognized as some of the most energetic astrophysical events since the Big Bang” that gave birth to our universe</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.world-science.net/exclusives/070226_grb-life.htm">It is undeniable that damage to the biota could be severe if a burst strikes (or has struck) the planet.</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.world-science.net/exclusives/070226_grb-life.htm">at least one has already struck Earth, causing the so-called Ordovician Mass Extinction 450 million years ago. The Earth’s second most devastating extinction, it destroyed an array of the life forms that had flourished until then, restricted in that time to the seas</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.world-science.net/exclusives/070226_grb-life.htm"> For thick-atmosphere planets, a gamma-ray burst’s ultraviolet rays would kill 90 percent of <I> D. radiodurans</I> at distances ranging from 13,000 to 62,000 light years, about two-thirds the galactic width, the researchers calculated</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.world-science.net/exclusives/070226_grb-life.htm"> Gamma-ray bursts are thought to emerge mainly from the poles of a collapsing star</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.world-science.net/exclusives/070226_grb-life.htm">Planets not lying in these cones would be comparatively safe; the chief worry is for those that do</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;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/133FEB3C-0ABD-42FC-AA71-4DCED5AD6A60/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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