01 01 atm at center 40 k 10 7 atm near edge

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Unformatted text preview: ical differentiation 1000 - 2000 K, 0.01 - 0.1 atm at center 40 K, 10-7 atm near edge • • • Condensation - volatilization followed by condensation, OR Evaporation - partial melting, evaporation, refractory particles remain solid Likely a combination of both… Solar Nebula Solar ! Protosun • • ! Planetesimals • • ! Begins H fusion <100,000 years after condensation Luminosity initially above H-R trend, 25% of mass expelled in intense solar wind (T-Tauri mass (Tphase) Accreting condensates form bodies 10 - 1000 km in diameter Initial flocculation of particles was likely electrostatic, not gravitational, due to charging from solar EM flux Planets • • • Form from the initial set of larger planetesimals that pass a critical size planetesimals that threshold… Begin to sweep up surrounding material… suppress the further growth of competing planetoids Eight major planets Solar Nebula Solar Inner System Outer System Planet Formation ! Planets - formed from accreting planetesimals Planets • Terrestrial planets • Mercury, Venus, Earth, Mars • Comprised chiefly of elements with low vapor pressures • Solid, rocky objects, relatively low volatile contents • Gas Giants (Jovian planets) • Jupiter, Saturn, Uranus, Neptune • Essen...
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