Planets icy dwarf planets surrounding jovian worlds

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Unformatted text preview: Some carbonaceous material, ices • Lower-density Jovian planets, icy dwarf planets surrounding Jovian worlds • Outer reaches of system • Icy comets, dwarf planets (e.g. Eris-Dysnomia) Terrestrial Planets: Mercury ! ! ! ! ! Orbit: Diameter: Density: No atmosphere Silicates, with a large Ni-Fe core • • ! ! 0.38 AU 4,880 km 5.43 g/cc 3,600 - 3,800 km diameter core Weak magnetic field (1% of Earth’s) High concentration of heavy elements, metals Very low (near zero) volatile content Terrestrial Planets: Venus ! Orbit: Diameter: Density: ! Heavy atmosphere ! ! • • ! 90 atmosphere pressure at surface Principally CO2, minor N2 Low volatile content • • • ! 0.72 AU 12,103 km 5.52 g/cc Atmosphere retained by higher gravity than Mercury Originally higher water content, lost by photolytic ionization of H2O in upper atmosphere, and subsequent gravitational loss of H2 Oxygen from H2O breakdown captured through oxidation of volcanic H2S to H2SO4 (sulfuric acid) Active volcanism • • • • Larger size allows retention of radiogenic heat in interior Slightly higher concentration of U than Earth, most likely No plate tectonics - lack of water prevents asthenosphere formation Catastrophic resurfacing ever...
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This document was uploaded on 04/05/2014.

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