<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I heard that too, which is why I'd side with Tomasz here. Of course, it would be interesting if two results from the same comet varied, meaning there's likely some separation process going on.</div><div><br></div><div>Still, I don't have a dog in this race, so it's not like my pet theory of solar system or Earth formation is on the line. :)<br><br><div><div style="font-size: 17px; line-height: normal; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961); -webkit-composition-fill-color: rgba(175, 192, 227, 0.235294);"><font size="3"><span style="line-height: 20px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.294118); -webkit-composition-fill-color: rgba(175, 192, 227, 0.231373);">Regards,</span></font></div><div style="font-size: 17px; line-height: normal; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961); -webkit-composition-fill-color: rgba(175, 192, 227, 0.235294);"><font size="3"><span style="line-height: 20px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.294118); -webkit-composition-fill-color: rgba(175, 192, 227, 0.231373);"><br></span></font></div><div style="font-size: 17px; line-height: normal; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961); -webkit-composition-fill-color: rgba(175, 192, 227, 0.235294);"><font size="3"><span style="line-height: 20px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.294118); -webkit-composition-fill-color: rgba(175, 192, 227, 0.231373);">Dan</span></font></div></div><dl style="margin: 0px 0px 0px 1em; padding: 0px; border: 0px; font-family: 'Helvetica Neue', Helvetica, 'Nimbus Sans L', Arial, 'Liberation Sans', sans-serif; font-size: 14px; line-height: 1.65; vertical-align: baseline; color: rgb(37, 37, 37); background-color: rgb(255, 255, 255);"></dl></div><div><br>On Dec 10, 2014, at 8:06 AM, BillK <<a href="mailto:pharos@gmail.com">pharos@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><span>On Wed, Dec 10, 2014 at 5:49 AM, spike wrote:</span><br><span><snip></span><br><blockquote type="cite"><span>So, tomorrow we get a clue for where the Earth's water came from. If 67P</span><br></blockquote><blockquote type="cite"><span>has a D/H ratio that matches Earth, well now isn't that interesting. If it</span><br></blockquote><blockquote type="cite"><span>matches Mars, isn't that puzzling. If it matches the Kuiper belt objects,</span><br></blockquote><blockquote type="cite"><span>now what do we think?</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Any guesses before the number comes out? I think it will match Earth</span><br></blockquote><blockquote type="cite"><span>because I have long since bought into the argument that our water came from</span><br></blockquote><blockquote type="cite"><span>comets.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><span></span><br><span></span><br><span>They already announced preliminary results last month.</span><br><span></span><br><span><<a href="http://news.sciencemag.org/europe/2014/11/doomed-comet-lander-delivered-harvest-science">http://news.sciencemag.org/europe/2014/11/doomed-comet-lander-delivered-harvest-science</a>></span><br><span>Quote:</span><br><span>And ROSINA, a Rosetta instrument that uses spectrometers to measure</span><br><span>gas abundances, has obtained a highly sought after result: the</span><br><span>so-called deuterium-to-hydrogen ratio of water in the comet's thin</span><br><span>atmosphere, or coma. The measured value for 67P is much higher than</span><br><span>the ratio in Earth's oceans and higher than in other comets, says</span><br><span>ROSINA principal investigator Kathrin Altwegg, of the University of</span><br><span>Bern. Three years ago, the comet Hartley-2 was found to have a D-to-H</span><br><span>ratio near that of Earth's oceans--sparking interest in the notion that</span><br><span>comet impacts delivered much of Earth's water. Altwegg says the result</span><br><span>for 67P could make asteroids the primary suspect again.</span><br><span>--------</span><br><span></span><br><span>BillK</span><br></div></blockquote></body></html>