Journal
SCIENCE
Volume 347, Issue 6220, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1261952
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Funding
- State of Bern
- Swiss National Science Foundation
- ESA PRODEX Program
- Max Planck Society
- BMWI [50QP1302]
- Jet Propulsion Laboratory [1496541]
- Belgian Science Policy Office via PRODEX/ROSINA PEA [90020]
- Centre National d'Etudes Spatiales at IRAP
- Centre National d'Etudes Spatiales at LATMOS
- Centre National d'Etudes Spatiales at LPC2E
- Centre National d'Etudes Spatiales at UTINAM
- Centre National d'Etudes Spatiales at CRPG
- European Research Council [267255]
- NASA [JPL-1266313]
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The provenance of water and organic compounds on Earth and other terrestrial planets has been discussed for a long time without reaching a consensus. One of the best means to distinguish between different scenarios is by determining the deuterium-to-hydrogen (D/H) ratios in the reservoirs for comets and Earth's oceans. Here, we report the direct in situ measurement of the D/H ratio in the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA mass spectrometer aboard the European Space Agency's Rosetta spacecraft, which is found to be (5.3 +/- 0.7) x 10(-4)-that is, approximately three times the terrestrial value. Previous cometary measurements and our new finding suggest a wide range of D/H ratios in the water within Jupiter family objects and preclude the idea that this reservoir is solely composed of Earth ocean-like water.
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