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Barycenter. Highlands. Rough terrain lighter many craters. 3.9 to 4.4 by Anorthosite Breccia. Maria (Seas). Flat terrain Darker Not a lot of craters Roughly circular Basalt rock 3.1 to 3.8 BY. Maria Highlands. Craters. Craters Meteor impacts Methods to determine age
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Highlands. • Rough terrain • lighter • many craters. • 3.9 to 4.4 by • Anorthosite • Breccia
Maria (Seas) • Flat terrain Darker Not a lot of craters Roughly circular • Basalt rock • 3.1 to 3.8 BY
Maria • Highlands
Craters • Meteor impacts • Methods to determine age • Superposition • Amount of weathering
Regolith • Lunar soil • Physically Weathered rock
Model for the Formation of the Moon • Fission Model • Earth had a baby
Model for the Formation of the Moon • Capture Model • Asteroid was passing by the Earth and got caught in its gravitational pull. • Is the accepted model for the formation of small moons
Model for the Formation of the Moon • Co-Accretion • Condensation Model and Colliding Planetesimals Model • Earth had a sister • Large moons on large planets are believed to have formed this way • Planet and moon formed at the same time, same way
Model for the Formation of the Moon • Collision-Ejection or Ejected Ring Model • Impact from a large object tore off a large piece of the Earth which was ejected into orbit around the Earth. This material reformed into the moon.
What properties were known about the moon since Apollo? • 4.5 BY • Highlands are made of Anorthosite • Maria are made of Basalt • Rock has very little volatile material • No Water • The ice found recently at the lunar north pole is from comets.