The only gravity measurements made on the surface of a heavenly body were on the moon during the Apollo 17 mission in 1973. An obvious objective was to meet the challenge of making gravity measurements on an extra terrestrial body. More specific objectives were to make an Earth-moon gravity tie, and to investigate the buried structure of the Taurus-Littrow valley, the Apollo 17 landing site. This valley lies between the North Massif and the South Massif and the nature of the valley fill was to be determined.

NASA experiments are carried out by teams. I was principal investigator of what...

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