Occurrence of giant impacts during the growth of the terrestrial planets

Mathematics

Scientific paper

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Impact, Mathematical Models, Planetary Evolution, Protoplanets, Terrestrial Planets, Accumulations, Collisions, Kinetic Energy, Lunar Evolution, Monte Carlo Method, Planetary Atmospheres, Planetary Mass, Planetary Surfaces, Viscous Drag, Planets, Terrestrial Planets, Impacts, Monte Carlo Methods, Simulations, Distribution, Size, Mass, Velocity, Angular Momentum, Formation, Moon, Earth, Heating, Melting, Rare Gases, Atmosphere, Venus

Scientific paper

Three dimensional Monte Carlo simulations of the accumulation of the terrestrial planets in the absence of gas drag produced results that are in general agreement with the number and distribution of the present planets. The accumulation process appears to be characterized by impact of bodies as large as three times the mass of Mars at velocities of about 9 kilometers per second. These giant impacts on earth may have supplied the material and angular momentum that formed the moon, should have heated earth to the melting point, and may have been responsible for the differences in the content of inert gases of the atmospheres of earth and Venus.

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