Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse

  title={Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse},
  author={J.-B. Vincent and Dennis Bodewits and S{\'e}bastien Besse and Holger Sierks and Cesare Barbieri and Philippe Lamy and R. Rodrigo and Detlef Koschny and Hans Rickman and H. Uwe Keller and Jessica Agarwal and Michael F. A’Hearn and A-T Auger and M. A. Barucci and J L Bertaux and Ivano Bertini and Claire Capanna and Gabriele Cremonese and Vania Da Deppo and Bj{\"o}rn J R Davidsson and Stefano Debei and Mariolino De Cecco and M. R. El-Maarry and Francesca Ferri and Sonia Fornasier and Marco Fulle and R. W. Gaskell and Lorenza Giacomini and O. Groussin and Aur'elie Guilbert-Lepoutre and Pablo Gutierrez-Marques and Pedro J. Guti{\'e}rrez and C. G{\"u}ttler and N. M. Hoekzema and Sebastian H{\"o}fner and S F Hviid and Wing-H. Ip and Laurent Jorda and J Knollenberg and Gabor Kovacs and Rainer Kramm and E. K{\"u}hrt and Michael K{\"u}ppers and Fiorangela La Forgia and Luisa Maria Lara and Monica Lazzarin and Vicky Lee and C{\'e}dric Leyrat and Zhong-Yi Lin and Jos{\'e} Juan Lopez Moreno and S C Lowry and Sara Magrin and Lucie Maquet and Simone Marchi and Francesco Marzari and Matteo Massironi and Harald Michalik and Richard Moissl and Stefano Mottola and Giampiero Naletto and N. Oklay and Maurizio Pajola and Frank Preusker and Frank Scholten and Nicolas Thomas and Imre P{\'e}ter T{\'o}th and Cecilia Tubiana},
Pits have been observed on many cometary nuclei mapped by spacecraft. It has been argued that cometary pits are a signature of endogenic activity, rather than impact craters such as those on planetary and asteroid surfaces. Impact experiments and models cannot reproduce the shapes of most of the observed cometary pits, and the predicted collision rates imply that few of the pits are related to impacts. Alternative mechanisms like explosive activity have been suggested, but the driving process… Expand
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