Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...212..879p&link_type=abstract
Science, vol. 212, May 22, 1981, p. 879-887.
Physics
122
Planetary Evolution, Planetary Mapping, Tectonics, Venus Surface, Earth Surface, Pioneer Venus 1 Spacecraft, Planetary Composition, Planetary Gravitation, Planetary Temperature, Plates (Tectonics), Radio Altimeters, Topography, Venus, Tectonics, Evolution, Comparisons, Terrain, Gravity, Topography, Wavelengths, Compensation, Depth, Surface, Crusts, Temperatures, Data, Subduction, Water, Highlands, Thermal Properties, Physical Properties, Maps, Composition, Volatile Elements, Morphology, Spectrum, Models, Fe
Scientific paper
Earlier data synthesized with data recently obtained by the Pioneer Venus Orbiter are analyzed with regard to general tectonics, interior, and long-term evolution of Venus. Comprehensive topographic maps, global properties of Venus, and variations in its gravity field are investigated, and bulk properties of Venus, earth, Mars, the sun, and chondritic meteorites relevant to planetary internal structure and evolution are studied. Although Venus was found to differ less than 30% from earth in comparing all important bulk properties, it appears to have evolved differently. It is noted that a slow rotation rate, the absence of a satellite, the virtual absence of a magnetic field, the dearth of water in the atmosphere, the abundance of primordial argon, and the high surface temperature, are properties in which Venus differs most from the earth. Further results showing the positive correlation of gravity and topography at all wavelengths and the apparent absence of any feature like an ocean indicate that Venus is a one-plate planet and its evolution apparently resembles that of Mars more than that of the earth.
Kaula William M.
Malin Michael C.
McGill George E.
Phillips James R.
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