<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/8e5d2d6b-91c2-4a7f-8ddf-41c30cfea7ea/28F31010-9D54-4301-9B77-83912108D1B0/" 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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html" href="http://www.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html" style="font-size: 11px;">www.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.newscientist.com/img/90B79CFE-60E6-4C02-A28A-FE4433BCEC01" alt="Jupiter's massive size, coupled with Io's close orbital distance to the planet, expose the moon to powerful gravitational forces. These forces constantly deform the moon, generating the heat that powers its volcanism. Similar, but less powerful, 'tidal' forces are thought to power geysers of water vapour erupting from Saturn's icy moon Enceladus (Illustration of Jupiter and Io: V Lainey/IMCCE-Paris Observatory)" /></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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html">Io, which is about the size of Earth's moon and is Jupiter's closest large satellite, is covered with lava flows and dozens of <A href="http://www.newscientist.com/article/dn11767-jupiter-moon-spews-volcanic-plumes-in-new-images.html">active volcanoes</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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html">The heat for this activity comes from the fact that the moon travels on an elongated path around Jupiter, and therefore feels the giant planet's gravity at different strengths along its orbit.</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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html">But it will not always be so, according to a new study led by Valéry Lainey of the Paris Observatory in France.</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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html">But Lainey and colleagues have found that the moons are, in fact, moving out of their resonance – Europa and Ganymede are gradually drifting away from Jupiter, while Io is moving towards 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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html"> "If this occurs on a short timescale, say [100 million] years or less, then we have been lucky to see Io in its volcanic glory, because dormancy will be the fate of Io when the resonance is broken," </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.newscientist.com/article/dn17328-solar-systems-most-volcanic-body-to-go-dormant.html">For every orbit that Ganymede makes, Europa makes two and Io four – a type of gravitational relationship called a Laplace resonance.</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/28F31010-9D54-4301-9B77-83912108D1B0/blog/" title="blog or email this clip"><img src="http://content8.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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