Comet 67P/Churyumov-Gerasimenko sheds dust coat accumulated over the past four years

@article{Schulz2015Comet6S,
  title={Comet 67P/Churyumov-Gerasimenko sheds dust coat accumulated over the past four years},
  author={Rita M. Schulz and Martin Hilchenbach and Y. Langevin and Jochen Kissel and Johan Sil{\'e}n and Christelle Briois and C{\'e}cile Engrand and Klaus Hornung and Donia Baklouti and Anais Bardyn and Herv{\'e} Cottin and Henning Fischer and Nicolas Fray and Marie Godard and Harry J. Lehto and L{\'e}na Le Roy and S. Merouane and François-R{\'e}gis Orthous-Daunay and J. A. Paquette and Jouni Ryn{\"o} and S. Siljestr{\"o}m and Oliver Stenzel and Laurent Thirkell and Kurt Varmuza and Boris Zaprudin},
  journal={Nature},
  year={2015},
  volume={518},
  pages={216-218}
}
Comets are composed of dust and frozen gases. The ices are mixed with the refractory material either as an icy conglomerate, or as an aggregate of pre-solar grains (grains that existed prior to the formation of the Solar System), mantled by an ice layer. The presence of water-ice grains in periodic comets is now well established. Modelling of infrared spectra obtained about ten kilometres from the nucleus of comet Hartley 2 suggests that larger dust particles are being physically decoupled from… Expand
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Icy grains have been directly detected or inferred in the circumnuclear region of various short- and long-period comets. In particular, comets 103P/Hartley 2, C/2002 T7 (LINEAR), and, recently C/2013Expand
High-molecular-weight organic matter in the particles of comet 67P/Churyumov–Gerasimenko
TLDR
It is concluded that the observed cometary carbonaceous solid matter could have the same origin as the meteoritic insoluble organic matter, but suffered less modification before and/or after being incorporated into the comet. Expand
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A wide range of data emerging from the Rosetta Mission that all point indirectly to biological activity in Comet 67P/Churyumov–Gerasimenko are discussed, including the detection of an overwhelming abundance of complex organic molecules at the surface by Philae and through IR imaging by theRosetta orbiter. Expand
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Abstract On November 4th, 2010, the Deep Impact eXtended Investigation (DIXI) successfully encountered comet 103P/Hartley 2, when it was at a heliocentric distance of 1.06 AU. Spatially resolvedExpand
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