Remote Sensing Studies of Lunar Crater Rays

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Craters: Formation, Impacts, Messier, Rays, Tycho

Scientific paper

The nature and origin of lunar crater rays has long been the source of major controversy. Some lunar scientists have proposed that rays are dominated by primary crater ejecta, while others have emphasized the role of secondary craters in producing rays. Pieters et al. (1985) presented the results of a remote sensing study of a portion of the ray system north of Copernicus. They provided evidence that the present brightness of the Copernicus rays in this sector is due largely to the presence of a component of highland ejecta intimately mixed with local mare basalt and that an increasing component of local material is observed in the rays at progressively greater radial distances from the parent crater. These results have been questioned and the origin of lunar rays is still uncertain [e.g., Schultz and Gault (1985)]. In an effort to better understand the processes responsible for the formation of lunar rays, we have utilized a variety of remote sensing data to study selected rays associated with Olbers A, the Messier crater complex, and Tycho. The data include near-IR reflectance spectra (0.6-2.5 um) and 3.8- and 70-cm radar maps.

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