Planetary and Lunar Exploration Space Science in the Twenty-First Century -- Imperatives for the Decades 1995 to 2015 (1988) / Chapter Skim
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1. Introduction
1. Introduction
Pages 1-3
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These questions continue to stimulate modern planetary science. In addition to illuminating some of these long-standing scientific questions, planetary studies have additional significance from a human perspective.
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On Earth, volcanoes, earthquakes, sea floor spreading, and continental drift are contemporary consequences of Earth's thermally agitated interior. Through a combination of gas trapped at the time of planet formation and volatiles released during subsequent planetary evolution, most of the planets have developed atmospheres.
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Comets are believed to be relatively well-preserved accumulations of matter left from the time of the solar system's birth. Comets are rich in volatile matter, suggesting that they formed in the relatively cold outer reaches of the early solar system.
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