Deimos Encounter by Viking: Preliminary Imaging Results

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Science  01 Sep 1978:
Vol. 201, Issue 4358, pp. 812-814
DOI: 10.1126/science.201.4358.812


Recent close flybys of Deimos by Viking revealed a smooth-appearing surface void of grooves. Higher-resolution pictures showed that the surface was actually covered with craters but that a regolith filled the smaller craters, giving the smooth appearance. The surface was also covered with boulders and bright streak-like markings analogous to base-surge or ejecta cloud deposits.