Computer Science
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...41..232c&link_type=abstract
Icarus, vol. 41, Feb. 1980, p. 232-239.
Computer Science
10
Callisto, Ganymede, Planetary Evolution, Planetary Surfaces, Chronology, Radiant Heating, Surface Reactions, Tectonics, Tides, Voyager Project, Jupiter, Satellites, Comparisons, Evolution, Ganymede, Callisto, Ages, Surface, Voyager, Tectonism, Radioactivity, Temperatures, Endogenic Modifications, Parameters, Data, Heating, Orbits, Ice, Dissipation, Eccentricity, Models, Cores, Features, Water, Thermal History, Mantle, Composition, Tidal Effects, Freezing, Mass, Density, Radius, Gravity, Flux
Scientific paper
The paper examines the differences in the apparent ages of the surfaces of Ganymede and Callisto revealed by Voyager images. The differences could be due to the persistence of tectonic activity on Ganymede beyond the time of early, heavy bombardment. The slightly greater radioactive content expected in Ganymede could prolong such activity by 0.5 million years beyond the cessation of endogenic surface activity on Callisto. It is concluded that if the different ages of the surfaces of Ganymede and Callisto are due to differences in internal evolution, the slightly higher radioactive content of Ganymede is the most likely cause; tidal dissipation could not have been important for Ganymede for more than 10 to the 8th power years, and it was never important for Callisto.
Cassen Pat
Peale Stanton J.
Reynolds Ray T.
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