ASTR 1010 1st EditionLecture 17Outline of Last Lecture I. Dark Side of the MoonII. EclipsesA. Lunar EclipseB. Solar EclipseOutline of Current LectureI. Lunar FeaturesA. MariaB. CratersII. Origin of the Earth & MoonCurrent LectureI. Lunar FeaturesA. Maria- On the moon, the Maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. - Three major Mares:a. Mare Imbriumb. Mare Crisiumc. Mare Tranquility- No Mare are present on the far side of the moon- Because of the location of the Mares, Maria must have formed before or during the synchronization of the moon.B. Craters- Crater: a large, bowl-shaped cavity on the moon, typically caused by an explosion or the impact of a meteorite or other celestial body- Types of Craters:a. Ray: A ray system comprises radial streaks thrown out during the formation of an impact crater. Copernicus (crater) is 100 miles in diameter, Tycho is 50 miles in diameter. Rayed craters are usually younger.b. Non-ray: An impact crater whose impact does not result in projectiles forming rays. Clavius 50 miles diameter. Bailley is 200 miles in diameter, but is on the far side of the moon.II. Origins of the Earth & Moon- Three possibilities:a. Simultaneousb. Capture processc. Fission/Fusion- All three theories have
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