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8_Craters - Planetary Accretion and Differentiation What...

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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?
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Impact craters - Morphologies and mechanics
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Crater Morphologies and Mechanics What are the morphologic differences between simple and complex craters? What happens during the contact, excavation, and modification stages of crater formation? How do multi-ring basins form? How do the various crater morphologies scale with crater size and with planetary gravity field? How does the transient cavity differ from the final crater? What portions of the target are ejected, melted, or otherwise modified, and how are they distributed in and around the final crater? What other kinds of modifications are seen in huge lunar craters?
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Impact energies and consequences The kinetic energy of a bolide depends on its mass and velocity, KE = 1/2 mv 2 . A 100-m rocky impactor hitting at 15 km/s has a kinetic energy density of 2x10 24 erg.
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