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- W1662236315 abstract "Giotto images reveal many features on the nucleus of Comet Halley, including gas- and dust-producing sources surrounded by an inactive region. In the inactive region, crater-like structures can be seen that may be extinct sources. These structures may develop by surface erosion of an active area and deposition of some excavated material on the periphery, creating crater-like rims. These rims are formed from clumps of comet regolith that can be lifted by the escaping gas. The lack of lift caused by the divergence of the gas flow near the boundary of an active region lets them fall back on the nucleus and create a rim. This may be a continuous process during perihelion passage. Supplementing the original concept of investigating the active and inactive regions, we conclude that three compositionally distinct areas should be sampled during the Rosetta mission: (1) The active regions rich in frozen gases and unprocessed dust; (2) The inactive region covered by a thin layer of fine dust enriched in organics that may be sintered. (3) The crater-like rims containing clumps of processed organics, silicates, and trapped frozen gases." @default.
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- W1662236315 date "1989-01-01" @default.
- W1662236315 modified "2023-09-27" @default.
- W1662236315 title "Morphology and Compositional Differentiation of the Surface of Comets" @default.
- W1662236315 hasPublicationYear "1989" @default.
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