Mare serenitatis: a preliminary definition of surface units by remote observations

There are many surface units in Mare Serenitatis and in the adjacent Montes Haemus that can be defined by remote, Earth-based observations at visual, infrared, and radar wavelengths. These highland and mare surface units are obvious in color-difference photographs and in radar images, while the infrared images have little or no differences. These characteristics are consistent with units having definite chemical differences. However, a better definition of these surfaces requires the synthesis of many more data sets.Paper presented at the Lunar Science Institute Conference on Geophysical and Geochemical Exploration of the Moon and Planets, January 10–12, 1973.This paper presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under Contract No. NAS 7–100, sponsored by the National Aeronautics and Space Administration.