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Mottola, S.; Arnold, G.; Grothues, H.-G.; Jaumann, R.; Michaelis, H.; Neukum, G.; Bibring, J.-P.; Schröder, S. E.; Hamm, M.; Otto, K. A.; Pelivan, I.; Proffe, G.; Scholten, F.; Tirsch, D.; Kreslavsky, M.; Remetean, E.; Souvannavong, F.; Dolives, B.
Science (American Association for the Advancement of Science), 07/2015, Letnik: 349, Številka: 6247Journal Article
The structure of the upper layer of a comet is a product of its surface activity. The Rosetta Lander Imaging System (ROLIS) on board Philae acquired close-range images of the Agilkia site during its descent onto comet 67P/Churyumov-Gerasimenko. These images reveal a photometrically uniform surface covered by regolith composed of debris and blocks ranging in size from centimeters to 5 meters. At the highest resolution of 1 centimeter per pixel, the surface appears granular, with no apparent deposits of unresolved sand-sized particles. The thickness of the regolith varies across the imaged field from 0 to 1 to 2 meters. The presence of aeolian-like features resembling wind tails hints at regolith mobilization and erosion processes. Modeling suggests that abrasion driven by airfall-induced particle "splashing" is responsible for the observed formations.
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in: SICRIS
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