PSRDPSRD presents www.psrd.hawaii.edu/Feb08/EarthMoonFormation.html Compositional Balancing Before Moon Formation A striking feature of the Earth and Moon.

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Presentation transcript:

PSRDPSRD presents Compositional Balancing Before Moon Formation A striking feature of the Earth and Moon is that they have identical oxygen isotopic compositions, in spite of considerable variation throughout the solar system.

PSRDPSRD presents Compositional Balancing Before Moon Formation Planetary embryo accretion simulation by John Chambers. Note how much mixing there is as accretion proceeds. Painting by James Garry Planet formation involved substantial mixing throughout inner solar system as planetary embryos accreted. Considering the variability in O- isotopes throughout the solar system, why do Earth and Moon have the same oxygen isotopic composition?

PSRDPSRD presents Compositional Balancing Before Moon Formation Oxygen isotopes might have equilibrated between Earth and Moon via the hot silicate atmosphere surrounding the proto-Earth and proto-lunar disk.