Harrison H. Schmitt

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A time of opportunity," Editorial, 30 Jan., p. 589) clearly are aware of the extraordinary foundation of scientific knowledge about the origin and history of the Moon, Earth, planets, and solar system that came as a consequence of U.S. explorations of the moon. I was surprised, however, by their implication that the time of human exploration of space has(More)
A number of conventional hypotheses relative to the Moon and the terrestrial planets deserve both questioning and unconventional thought based on the profound advances in planetary research in recent years. For example, elemental and isotopic data on the lower mantle of the Moon suggest that lunar origin by Giant Impact is unlikely. The apparent existence(More)
It is possible to generate nuclear power without the production of radioactive waste or radioactive material that can escape the reactor in case of an accident. The key lies in controlling the fusion of third-generation fuels containing 3 He. This will not be an easy task because there are both physics and economic issues to face, but it is a goal worth(More)
Three potential detrimental effects of lunar 3 He mining have been identified; visual changes, atmospheric contamination, and solid waste disposal. The removal of small craters (<20 m diameter) and the change in the albedo of the surface may cause a slight darkening of the regolith. However, it is not expected that this change will be visible from the Earth(More)
Introduction: The time-stratigraphic formulation of major events in lunar history has a long and continuing usefulness [1]. On the other hand, a descriptive formulation, based on the geological character of major lunar features [2] but consistent with the time-stratigraphic system, may enable broader multidisciplinary discussions of lunar and planetary(More)