cheat sheet 2

cheat sheet 2 - MOON orbit about 384000 km from earth...

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Unformatted text preview: MOON: orbit: about 384000 km from earth, laser-ranging tech allows us to measure orbit within cm-necessary for unmanned spacecraft landings; angular diameter=0.5°, radius= 1738km, mass=7.3x10 22 , density=3300kg/m 3 , gravity is 1/6 of earth, escape speed= 2.4 km/s, noon temp= 400K, maria: 14 dark circular areas created by lava flow (Mare Imbrium 1100 km diameter), composed of iron (dense and dark), similar to basalt and likely formed from upwelling molten material, 3.2 to 3.9 billion yrs old, Latin names; lunar highlands-lighter areas elevated Kms over maria (terrae), made of rocks rich in Al (light color and low density), 4 to 4.4 yrs old, mtn ranges named after earths ranges; craters-200km across bowl-shaped depressions formed by meteoritic impact, particularly clear near terminator (line separating day from night), most prevalent in highlands, range from 100s of km to microscopic, named after scientists, diameter=10x that of incoming meteoroid, ejected material (ejecta blanket) may form second craters, some caused by faults and volcanic activity; has “near side” and “far side” because rotates once per orbit, Far side composed almost entirely of highlands and little maria (earth played role in moon formation); Synchronous Orbit: rotation period and revolution around earth ~ 27.3 days, tidal force is 20x greater than earths, large tidal bulge insinuates that moon used to be 2/3 the distance from earth than it is 27....
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