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Sunrise on Gliese 876d
skwirlinator
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5-21-2008 1:15 PM
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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/0acf4881-feac-473a-aeba-9a47da7a40e8/3D77EEDB-7146-47C8-946F-4F7A9EFEAD39/" 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://antwrp.gsfc.nasa.gov/apod/image/0805/reddwarf_nielsen_big.jpg" href="http://antwrp.gsfc.nasa.gov/apod/image/0805/reddwarf_nielsen_big.jpg" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/image/0805/reddwarf_nielsen_big.jpg"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/95C63C40-0A8F-46D0-9862-BB2533A917F0" alt="http://antwrp.gsfc.nasa.gov/apod/image/0805/reddwarf_nielsen_big.jpg" /></div></blockquote><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://content8.clipmarks.com/images/clip-icon.gif" 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.coolscifi.com/forums/showthread.php?t=193133" href="http://www.coolscifi.com/forums/showthread.php?t=193133" style="font-size: 11px;">www.coolscifi.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.coolscifi.com/forums/showthread.php?t=193133"><DIV> <B> Explanation: </B> On planet Gliese 876d, sunrises might be dangerous. Although nobody really knows what conditions are like on this close-in planet orbiting variable <A target="_blank" href="http://en.wikipedia.org/wiki/Red_dwarf">red dwarf</A> star <A target="_blank" href="http://en.wikipedia.org/wiki/Gliese_876">Gliese 876</A>, the above artistic illustration gives one impression. With an orbit well inside <A target="_blank" href="http://www.nineplanets.org/mercury.html">Mercury</A> and a mass several times that of Earth, <A target="_blank" href="http://en.wikipedia.org/wiki/Gliese_876_d">Gliese 876d</A> might <A target="_blank" href="http://www.nature.com/nature/journal/v429/n6994/full/nature02609.html">rotate so slowly</A> that dramatic differences exist between night and day. <A target="_blank" href="http://exoplanets.org/gl876_web/gl876_graphics.html">Gliese 876d</A> is imagined above showing significant <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap051002.html">volcanism</A>, possibly caused by <A target="_blank" href="http://burro.astr.cwru.edu/Academics/Astr221/Gravity/tides.html">gravitational tides</A> flexing and <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap040502.html">internally heating</A> the planet, and possibly more volatile during the day. The rising <A target="_blank" href="http://en.wikipedia.org/wiki/Red_Dwarf">red dwarf</A> star shows expected stellar <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap060710.html">magnetic activity</A> which includes <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap060416.html">dramatic</A> and <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap000403.html">violent prominences</A>. In the sky above, a hypothetical moon has its thin atmosphere blown away by the red dwarf's <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap000318.html">stellar wind</A>. Gliese 876d excites the <A target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap070502.html">imagination</A> partly because it is one of the few <A target="_blank" href="http://exoplanet.eu/">extrasolar planets</A> known to be close to the <A target="_blank" href="http://www.pbs.org/lifebeyondearth/alone/habitable.html">habitable zone</A> of its parent star. </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;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/3D77EEDB-7146-47C8-946F-4F7A9EFEAD39/blog/" title="blog or email this clip"><img src="http://content9.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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