Ocean-like water in the Jupiter-family comet 103P/Hartley 2

@article{Hartogh2011OceanlikeWI,
  title={Ocean-like water in the Jupiter-family comet 103P/Hartley 2},
  author={P. Hartogh and D. Lis and D. Bockel{\'e}e-Morvan and Miguel de Val-Borro and N. Biver and M. K{\"u}ppers and M. Emprechtinger and E. Bergin and J. Crovisier and M. Rengel and R. Moreno and S. Szutowicz and G. Blake},
  journal={Nature},
  year={2011},
  volume={478},
  pages={218-220}
}
For decades, the source of Earth's volatiles, especially water with a deuterium-to-hydrogen ratio (D/H) of (1.558 ± 0.001) × 10−4, has been a subject of debate. The similarity of Earth’s bulk composition to that of meteorites known as enstatite chondrites suggests a dry proto-Earth with subsequent delivery of volatiles by local accretion or impacts of asteroids or comets. Previous measurements in six comets from the Oort cloud yielded a mean D/H ratio of (2.96 ± 0.25) × 10−4. The D/H value in… Expand
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Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that areExpand
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