Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..171h&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 171-173 (SEE N85-23474 13-91)
Physics
Concentration (Composition), Cratering, Hypervelocity Impact, Impact Melts, Impactors, Planetary Geology, Structural Properties (Geology), Celestial Bodies, Geomorphology, Meteorites, Meteoritic Damage, Planetary Structure, Solar System
Scientific paper
The existence and effects of saturation cratering throughout the solar system was studied. It is found that saturation equilibrium cratering exists nowhere in the solar system, and that diameter distributions in even the most heavily cratered provinces reveal initial production functions related to impacting bodies. Different populations of impactors in different epochs and regions of the solar system are identified. The hypotheses are crucial for interpretation of planetary history. The crater counts on frontside lunar uplands, used as a basic reference curve identified with one of their populations of early impactors, are confirmed. This crater population is deficient in 1 to 16 km craters, which may be obliterated by the lavas. It is concluded that this curve is not representative of heavily cratered highlands, and is of questionable value as a standard comparison curve. The role of giant impacts during the intense early bombardment period was studied. Giant impact(s) on the primeval Earth may have initiated lunar formation.
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