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<blockquote data-quote="Channel Hopper" data-source="post: 908427" data-attributes="member: 175144"><p>I was going to post similar but in a slightly different vein. The scientists haven't confirmed that all comets are heavy water providers, just this one.</p><p></p><p>Comet 67p is a once only comet from its trajectory. The vast majority that have come close to the inner planets are repeat offenders, having been pulled in, then 'captured' by the larger gaseous Jupiter. In flying close to the sun, there is every chance that the deuterium is broken down into more common water molecules.</p><p></p><p>Start going back in time, and any number of cosmic events could have brought in untold numbers of objects from the Trans-Neptunian area to impact on Mars, Venus and this planet.</p><p><em></em></p><p><em>The outer Oort cloud may have trillions of objects larger than 1 km (0.62 mi),<a href="http://en.wikipedia.org/wiki/Oort_cloud#cite_note-Morbidelli2006-3" target="_blank">[3]</a> and billions with <a href="http://en.wikipedia.org/wiki/Absolute_magnitude#Solar_System_bodies_.28H.29" target="_blank">absolute magnitudes</a><a href="http://en.wikipedia.org/wiki/Oort_cloud#cite_note-14" target="_blank">[14]</a> brighter than 11 (corresponding to approximately 20-kilometre (12 mi) diameter), with neighboring objects tens of millions of kilometres apart.</em></p><p></p><p><a href="http://en.wikipedia.org/wiki/Oort_cloud" target="_blank">http://en.wikipedia.org/wiki/Oort_cloud</a></p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 908427, member: 175144"] I was going to post similar but in a slightly different vein. The scientists haven't confirmed that all comets are heavy water providers, just this one. Comet 67p is a once only comet from its trajectory. The vast majority that have come close to the inner planets are repeat offenders, having been pulled in, then 'captured' by the larger gaseous Jupiter. In flying close to the sun, there is every chance that the deuterium is broken down into more common water molecules. Start going back in time, and any number of cosmic events could have brought in untold numbers of objects from the Trans-Neptunian area to impact on Mars, Venus and this planet. [I] The outer Oort cloud may have trillions of objects larger than 1 km (0.62 mi),[URL='http://en.wikipedia.org/wiki/Oort_cloud#cite_note-Morbidelli2006-3'][3][/URL] and billions with [URL='http://en.wikipedia.org/wiki/Absolute_magnitude#Solar_System_bodies_.28H.29']absolute magnitudes[/URL][URL='http://en.wikipedia.org/wiki/Oort_cloud#cite_note-14'][14][/URL] brighter than 11 (corresponding to approximately 20-kilometre (12 mi) diameter), with neighboring objects tens of millions of kilometres apart.[/I] [url]http://en.wikipedia.org/wiki/Oort_cloud[/url] [/QUOTE]
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