Meteorites, Comets, or ???--
Water on Earth and Moon May Have Same Source: Ancient Meteorites | Space.com: " . . . . "I wonder whether Saal and his colleagues can exclude that the samples they investigated contain cometary water," Hartogh told SPACE.com. The European Space Agency's Rosetta mission might be able to resolve the question of whether comets or meteorites are the origins of water in Earth and the moon when it reaches the comet 67P/Churyumov-Gerasimenko in 2014, Hartogh said. Rosetta, which launched in March 2004, will analyze the comet's isotope ratios to see how closely they match those of the Earth and the moon." (read more at link above)
photo source: NASA
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