Planetary Exploration, 1968-1975; Report of a Study by the Space Science Board, Washington, D.C., June 1968 (1968) / Chapter Skim
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Introduction
Introduction
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These are some of the questions that the present study attempts to assess. The 1965 study examined both lunar and planetary investigations, clearly pointing out that the two are closely interrelated and that one cannot adequately plan a planetary program without comparable planning for lunar studies.
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A once-in-a-century opportunity occurs in 1977-1978 when the planets will be so positioned that their gravitational fields can be exploited for a grand tour of the great planets, Jupiter, Saturn, Uranus, and Neptune -- again without the need for extraordinarily powerful boosters. The rare opportunities for planetary voyages, the length of these voyages, and the long times required for preparing experiments all imply that planning for planetary exploration must take place years in advance of the actual missions.
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