Other
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...31..260h&link_type=abstract
Icarus, vol. 31, June 1977, p. 260-276. NASA-supported research.
Other
32
Chronology, Meteorite Craters, Planetary Surfaces, Planetology, Asteroids, Collision Rates, Comets, Conversion Tables, Density (Mass/Volume), Mars Surface, Monte Carlo Method, Orbit Calculation, Orbital Velocity
Scientific paper
The relative numbers of impacts on different planets, estimated from the dynamical histories of planetesimals in specified orbits (Wetherill, 1975), are converted by a described procedure to crater production rates. Conversions are dependent on impact velocity and surface gravity. Crater retention ages can then be derived from the ratio of the crater density to the crater production rate. The data indicate that the terrestrial planets have crater production rates within a factor ten of each other. As an example, for the case of Mars, least-squares fits to crater-count data suggest an average age of 0.3 to 3 billion years for two types of channels. The age of Olympus Mons is discussed, and the effect of Tharsis volcanism on channel formation is considered.
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