7_Planet_differentiation

7_Planet_differentiation - Planetary Heat Sources Questions...

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Planetary Heat Sources Questions to think about : Why does radioactive decay release heat, and which radioisotopes are responsible for planetary heating? What role did now-extinct radionuclides play in heating solar system bodies? What roles have core differentiation/solidification, impacts, and tidal effects played in heating the Earth over time? Why (and how) does melting occur now in the Earth’s interior? Which heating mechanisms were responsible for the differentiation of the Earth? Which heating mechanisms were not important until later? What heating mechanisms are likely to have dominated on Venus, Mars, and the Moon?
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Planetary Accretion and Differentiation
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Planetary Accretion and Differentiation What did planets accrete from, and how quickly? Why did planets undergo differentiation? How were elements partitioned during planetary differentiation into cores, mantles, and crusts? How can we use the sizes, masses, and shapes of planets to model the chemical and mineralogical compositions of their interiors? What information can seismic data provide that other kinds of measurements cannot? Questions to Think About :
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Planetary accretion disk (artist’s conception)
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Planetary accretion disk (the real thing)
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Snapshots of a planetary accretion model at 10,000 year increments, illustrating how 4000 planetesimals accreted into a few planets. Bars define the widths of feeding zones. Orbital eccentricity Semimajor axis Accretion was fast A few million years
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objects were initially located. Each row is a different simulation that leads to 3 or 4 terrestrial-like planets. Feeding zones
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7_Planet_differentiation - Planetary Heat Sources Questions...

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