6_Planet Heat Sources

6_Planet Heat Sources - Questions from previous class Why...

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Questions from previous class: Why does the Sun shine? How do stars evolve, what processes in stars produce new elements, and how do elements get recycled? What are “cosmic” element abundances? What are chondrites (chondritic meteorites), and why are they important? What is the condensation sequence? How do the cosmochemical behaviors of elements differ from their geochemical behaviors?
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Radioactivity and Other Planetary Heat Sources
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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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Nuclei are held together by an immensely strong binding force that acts over only very short distances. The more protons and neutrons in the nucleus, the stronger the binding force that each one experiences. Counteracting binding energy is the electrostatic repulsion between protons. This effect overtakes binding force at A = 56 (Fe) and thereafter larger nuclei become less stable (or unstable). Decay of
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6_Planet Heat Sources - Questions from previous class Why...

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