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SUMMARY OF PRINCIPAL RECOMMENDATIONS 1. We recommend that NASA in its l97l congressional budgetary presentation bring to Congress a long-term plan for the exploration of the outer parts of the solar system (page 7). 2. We fully endorse the statements of previous Space Science Board studies with regard to funding and recommend that a substantially increased fraction of the total NASA budget be devoted to planetary exploration (page 8). 3. We recommend eight prime scientific objectives of the exploration of the outer solar system (page 8). 4. We recommend the continuation of the Pioneer capa- bility for outer-solar-system studies and the development of a new spacecraft of flexible capability and increased payload capacity (page l4). 5. We recommend a series of missions in order of scien- tific significance (page l5). a. Jupiter deep-entry probe and flyby (1974) b. Jupiter orbiter mission (l976) c. Earth-Jupiter-Saturn-Pluto missions (l977) d. Earth-Jupiter-Uranus-Neptune missions (1979) e. Earth-Jupiter-Uranus entry-probe missions (early l980's) 6. We recommend immediate start on detailed design studies of possible probes for the atmospheres of the major planets (page l6). 7. We recommend development of a hybrid spinning space- craft, design studies leading to a data system that can handle both cruise mode and encounter operation, and that special attention be devoted to design of a spacecraft that can survive and remain magnetically clean after passing through the Jovian environment (page 17). 8. We recommend that design studies be made of mass spectrometers for deep-entry probes and of several types of imaging systems (page 19). 9. We make several recommendations with regard to radio links, bistatic radar, and ground-based radar (page 20).
l0. We make several recommendations with regard to ground- based studies and earth-orbital observations (page 22). ll. We recommend that NASA proceed with the development of advanced methods of propulsion useful for exploration of the solar system (page 24).
