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Summary
DescriptionPlanetary accretion and differentiation.svg
English: Processes that lead to the formation of a terrestrial (Earth-like) planet. From left to right: 1. dust particles condense from a planetary disc; 2. clusters of dust stick together, gradually obtaining the size of asteroids and planetesimals and eventually (by increasingly violent collisions and impacts) proto-planets; 3. when it grows large enough the interior of a planetesimal heats up, eventually it gets enough to cause partial melting; 4. siderophile elements sink to the mass center (grey arrows), while volatile (atmophile) elements rise to the surface (blue arrows); 5. inside the proto-planet a metallic core separates from a silicate mantle, while degassing gives the planet its atmosphere.
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