<p><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 18px;">Earth’s oceans likely started out as space snowballs born far beyond the orbit of Pluto, a new study says. Water-rich comets<a href="http://www.nature.com/nature/journal/vaop/ncurrent/full/nature10519.html" target="_blank" style="outline-width: 0px; outline-style: initial; outline-color: initial; font-weight: bold; font-style: inherit; font-size: 12px; font-family: inherit; vertical-align: baseline; color: #0068a5; text-decoration: none; padding: 0px; margin: 0px; border: 0px initial initial;">&nbsp;</a>collided with the young planet after hurtling through the nascent solar system, and probably delivered a significant amount of the water on this planet.</span><span style="color: #333333; font-family: arial, helvetica, sans-serif; font-size: 14px; line-height: 21px;">&nbsp;<a href="http://www.popsci.com/science/article/2011-10/space-rock-probably-helped-deliver-earths-oceans" title="Space Rocks Like This One Probably Helped Deliver Earth's Oceans">More</a> (Source: Popular Science)</span></p>