Past Climate change cannot be tied to Earth passing through galactic plane


	Past Climate change cannot be tied to Earth passing through galactic plane

Oortcloud

6-27-2009 1:38 AM

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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/da44284e-18de-4426-88d0-851fd79b1832/7DAFB79A-0B65-4752-98E5-6C47E8FC315E/" 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.universetoday.com/" href="http://www.universetoday.com/" style="font-size: 11px;">www.universetoday.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.universetoday.com/"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.universetoday.com/img/0EAC0C0A-6B71-4565-A66F-4A6FC4B5CF7B" alt="The latest map of the Milky Way shows only two arms. Credit: NASA/ Spitzer Space Telescope" /></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.universetoday.com/"><A rel="external" title="" class="alinks_links" href="http://www.universetoday.com/guide-to-space/earth/">Earth</A>'s climate has changed over time, but the cause for the changes has been hotly debated.  One idea  (<A href="http://www.gsajournals.org/perlserv/?request=get-document&doi=10.1130%2F1052-5173(2003)013%3C0004:CDOPC%3E2.0.CO%3B2&ct=1">Shaviv and Veizer,2003</A>), suggested  that perhaps two-thirds to three-fourths of the variance in Earth's temperature  over the past  500 million years may be attributable to when our solar system passes through the spiral arms of the Milky Way <A rel="external" title="" class="alinks_links" href="http://www.universetoday.com/guide-to-space/galaxies/">galaxy</A>. </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.universetoday.com/"><P>"Although previous work found a correlation between the 140 Myr climate cycle on Earth and the intersection with spiral arms," write researchers  Adrian Melott, Andrew Overholt, and Martin Pohl, "with new data on the structure of the galaxy, this correlation disappears."
<A class="more-link" href="http://www.universetoday.com/2009/06/26/past-climate-change-cannot-be-tied-to-earth-passing-through-galactic-plane/#more-33538"><B>Click to continue…</B></A></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/7DAFB79A-0B65-4752-98E5-6C47E8FC315E/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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