Formation of the Moon By Brad Shaver. Previous Models Fission Capture Binary Accretion.

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Presentation transcript:

Formation of the Moon By Brad Shaver

Previous Models Fission Capture Binary Accretion

Fission Model Idea was Earth spinning at high rate. Tossed material off surface. Problem is that the moon should be orbiting at earth’s equator!

Capture Model Moon formed in different location Captured by earth However, moon and earth have same composition!

Binary Accretion Model Moon formed from remains of earth Similar to planets forming from remains of stars Problem is moon doesn’t have much metallic iron!

Along comes Apollo Lunar samples show same makeup as earth – Density of moon is roughly equal to earth’s mantle Have very little volatile elements – Formed in high temperature Oxygen isotopes similar to earth So… The moon must be from earth!

Kona meeting 1984 meeting in Hawaii – Discussed other ideas for origin of moon – Impact model became popular Explained high angular momentum Protoplanets helped form this idea -collided with each other in early solar system

Impact Model Basic Idea – Collision with earth Caused material to be thrown off Reaccreted to form moon

Impact Model continued Accretion caused magma oceans Lunar samples showed evidence for this Hot enough to get rid of volatile elements

Moons Interior Crust km, mostly anorthite Regolith 3-5m in maria, 10-20m in highlands Mantle around 100km, makes up most of moons interior Core Might be partially molten The cause of the offset center of mass may be due to the crust being uneven

After cooling Maria began to form from impacts Lunar samples suggest came from mantle Usually 1-2 km thick and low viscosity

Volcanism Volcanoes also contributed to maria Dome and cone Viscosity low Large concentration of cones in Marius hills complex

Impact model for other bodies? Yes Mercury is mostly core (60%) Density is equal to iron density Venus and Uranus rotation

References "Moon." Wikipedia, The Free Encyclopedia. 11 Nov 2008, 15:56 UTC. 13 Nov Spudis, Paul D. "Moon." World Book Online Reference Center World Book, Inc. (

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