Issue Date: December 15, 2014
Comets Questioned As Water Source
Water contained in the comet 67P/Churyumov-Gerasimenko has a deuterium/hydrogen ratio vastly unlike that on Earth, a new study reports (Science 2014, DOI: 10.1126/science.1261952). The finding implies that comets may not have seeded our nascent planet with water.
The results, obtained from the ROSINA instrument aboard the European Space Agency’s Rosetta spacecraft, which is orbiting the 2.5-mile-long comet, were announced at . . .
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