liquid metallic h diamond bodes law distances of the

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Unformatted text preview: tially solar in composition (H, He) • May have condensed liquid or solid cores (?) • Liquid metallic H? Diamond? • Bode’s Law • Distances of the planets from the Sun obey a simple arithmetic relation a = 0.4 + 0.3(2n-2) where n = 2, 3, 4… • Where a = distance in Astronomical Units (AU) - mean distance from Sun to Earth (93 million miles, 1.5 x 108 km) • Likely a result of orbital resonance effects Planet Formation (cont’d) ! Mass Distribution • • 99.87% of solar system mass is in Sun 0.13% is all the rest of the solar system combined, most of which is Jupiter • • 71% of planetary mass is in Jupiter Most of the remaining 29% is in Saturn, Uranus, Neptune • 0.44% of planetary mass is in the terrestrial planets • 50.3% in Earth • 40.9% in Venus • 5.4% in Mars • 2.8% in Mercury Formation of Planetary Materials ! Required first the condensation of rocky material in the solar nebula • Nickel-Iron • Likely the first to condense in nebula • Minerals kamacite and taenite • Highest temperature of condensation (~1400 K) • Silicates, Other Minerals • Early condensation of metallic silicon (Si) • Condensed in nebula at 1300 - 1000 K • Higest temperature condensates included perovskite (CaTiO3) • Common mineral condensates were enstatite (MgSiO3), feldspars • Solid-solid reactions • At slightly lower temperatures (700 - 500 K), solids reacted to form alteration products • Troilite (FeS) from reaction of sulfur with kamacite/taenite • Olivine from reaction of enstatite with kamacite/taenite • FeO (wustite) from reaction of oxygen with kamacite/taenite...
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