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Published online by Cambridge University Press: 25 April 2016
The past triennium has seen an unprecidented increase in our knowledge and understanding of the solar system and, in particular, of the planets and satellites of the outer solar system. This epoch – 1 January 1979 to 31 December 1981 – has witnessed major spacecraft missions to Venus, Jupiter and Saturn by the United States and the launch of further missions to Venus by the Soviet Union.