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Published online by Cambridge University Press: 24 November 2021
The program of exploration of solar system objects from space is now In a more mature phase where third generation missions to inner as well as outer solar system bodies are developed. Emphasis in the inner solar system is on Mars and Venus, in the outer-solar system on Jupiter (Galileo Mission). The exploration of the primitive small bodies (comets, asteriods) has lagged in the past, partly due to technological considerations. Following the spectacular, but still reconnaissance-level flybys of Comets Giacobini-Zinner and Halley in 1985 and 1986, respectively, ISAS considers a cometary flyby and coma sample return mission, and NASA plans to initiate an even more comprehensive exploration by conducting a close flyby of a main-belt asteroid, followed by a multi-year rendezvous with a short-period comet (CRAF) in the early 1990s.