Physics – Space Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21..196c&link_type=abstract
(International Union of Geodesy and Geophysics, General Assembly, 18th, Hamburg, West Germany, Aug. 15-27, 1983) Reviews of Geop
Physics
Space Physics
2
Asteroids, Comets, Planetary Evolution, Collision Parameters, Protoplanets, Research And Development, Size (Dimensions), Planets, Asteroids, Comets, Review, Planetesimals, Protoplanets, Models, Composition, Refractory Elements, Volatiles, Formation, Evolution, Gaps, Orbits, Distribution, Earth-Crossers, Gravity Effects, Thermal Effects, Collisions, Classification, Physical Properties, Metals
Scientific paper
Asteroids and comets represent a virtually negligible fraction of the mass of the solar system. However, their physical/chemical properties and locations in the system are of particular interest, since they provide most of the observational and experimental clues about the earliest epochs of solar system history. The dominant view in 1982 is that comets and asteroids together constitute the entire remnant population of planetesimals originally formed early in the development of the solar system. Populations of comets and asteroids have undergone three chief kinds of evolution since their formation. Gravitational encounters with large bodies like planets have changed the orbits of many of the bodies. Collisions among some planetesimals modified their physical properties, while thermal processes modified physical, chemical, and geological characteristics of the bodies. Major progress has been made since 1979 in classifying smaller, darker, and more distant asteroids. Attention is also given to earth-approaching objects and cometary characteristics.
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