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Published August 15, 1969 | Published
Journal Article Open

Differences between proposed Apollo sites: 1. Synthesis


Recent observations of the spectral reflectivity and emissivity of the five prime Apollo landing sites are evaluated in the context of similar observations of other localities on the moon and of data returned from unmanned lunar probes. We conclude that those five sites differ significantly only in minor constituents and/or relative valence states and that those differences are more modest than the differences that characterize mare regions generally. Recommendations of priorities for the five prime Apollo sites are made based on their uniqueness for sample return. Sampling of other lunar localities displaying anomalous emissivities and extreme color differences will be required to ascertain the full range of lithologies that constitute the lunar surface.

Additional Information

Copyright 1969 by the American Geophysical Union. (Received June 16, 1969.) This work has been supported by NASA grants NGL-05-002-003, (at Caltech), NGR-22-009-350, (at MIT), and contract NASW-417, (at Bellcomm, Inc.). Contribution 1633 of the Division of Geological Sciences, California Institute of Technology.

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