Astronomy 101 chapter 7 notes
Astronomy 101 chapter 7 notes ASTR 101
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This 1 page Class Notes was uploaded by Breanab on Monday March 21, 2016. The Class Notes belongs to ASTR 101 at University of New Mexico taught by Trace Tessier in Spring 2016. Since its upload, it has received 14 views. For similar materials see Introduction to Astronomy in Astronomy at University of New Mexico.
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Date Created: 03/21/16
Lecture 7 ▯ The moon ▯ Lunar structure The crust (highlands due to higher elevation, lighter in color) is 60 km thick on earth side and 150 km thick on far side Maria is the dark areas, made of mantle materials, mainly basalt. Connected to more recent lava flows Moon is composed of material very similar to earths mantle Many craters due to meteorite impacts, only important source of erosion Highlands have 10x the crater density of maria, highlands are older ▯ Formation is unsure, three theories Fission: the material that would be the moon was thrown off the earth. o Problem: earth doesn’t spin fast enough Coformation: the moon and the earth formed out of the same material at the beginning of the solar system. o Problem: moon has different density and composition Capture: the moon was a stray body captured into orbit around earth. Problem: an extremely unlikely event ▯ Another theory added, Impact: early in the solar system, a mars sized object hit the forming earth, ejecting material from the mantle which coalesced to form the moon. Computer simulations suggest this is plausible. Thea
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