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Gloersen, P., Nordberg, W., Schmugge, T. J., Wilheit, T. T., and

Campbell, W. J., 1973b, Microwave signatures of first-year and

multiyear sea ice: Jour. Geophys. Research, v. 28, no. 18,

p. 3564-3572.

Hammack, James C., 1977, Landsat goes to sea: Photogrammetric Eng. and

Remote Sensing, Vol. XLIII, no. 6, p. 683-691.

Harris, G. and Graham, L. C., 1976, Landsat-radar combination; 13th

Congress Int. Soc. Photogramm. Comm. VII, Helsinki, Finland.

Hemphill, W. R., Stoertz, G. E., Markle, D. A., 1969, Remote sensing of Internat. Symposium on Remote Sensing of

luminescent materials:

Environment, 6th, Ann Arbor, Mich. 1969, Proc., p. 565-585.

Hemphill, W. R., and Watson, R. D., Bigelow, R. C., and Hessen, T. D., 1977, Measurement of luminescence of geochemically stressed trees and other materials, U.S. Geol. Survey Prof. Paper 1015, p. 93-112, 14 figs., 9 tables.

Kleinkopf, M. D., de la Fuente D., M. F., Raines, G. L., and Peterson, D. L., 1977, Geophysical Research in Porphyry Copper Exploration, Northern Mexico: Geol. Soc. of America, Abstracts with Program, Rocky Mountain Section, vol. 8, no. 5, p. 595.

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Special Issue of Aviation Week and Space

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Moon

Current plans for additional lunar exploration are uncertain.

The Lunar Polar Orbiter (LPO), a spacecraft primarily designed for systematic geochemical measurements of the surface, is being studied.

Large jumps in knowledge could occur from future planetary

exploration with respect to Venus and the satellites of the outer planets (Jupiter, Saturn) which are at present largely unknown.

The next few years will see a rapid expansion of our knowledge of

the solar system. The major events anticipated are as follows:

Mars

In addition to the Viking missions previously cited, high public interest in Viking has stimulated recommendations for another Mars mission

in 1984. Rovers with a 100 km roam radius and an orbiter equipped mainly with geochemical sensors and penetrators, and possibly a sample return, are being considered.

Venus

A Venus orbiter imaging radar (VOIR) is needed to study the surface features of this planet. This radar has been given the highest ranking by most science advisory groups and will return high resolution images (less than 1 km) of most of the planet. Because Venus is closest to the Earth in size and composition, this mission, and the 1978 radar mission to measure mechanical properties of the Venusian surface, have particular interest to terrestrial geologists.

are members of the science team.

Two GS scientists

Jupiter

Two Voyager spacecraft are presently on their way to Jupiter and Saturn. The satellites of those planets range widely in density and surface properties, and considerable variations in the geology are anticipated. Voyager will return several thousand pictures for study and analysis. A subsequent mission to orbit Jupiter would provide a more systematic set of observations than will be possible from Voyager.

Saturn

The Voyagers, launched in 1977 for an encounter with Jupiter, will continue on for an encounter with Saturn in 1983.

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