as3 - Solar System Planets: The Earth + Moon I. Moon -...

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13 Oct 2003 Solar System - Dr. C.C. Lang 1 Solar System Planets: The Earth + Moon I. Moon - Atmosphere - Surface/Geological Features/Moon Rocks - Interior - Origin II. Mercury - Basic Facts - Exploration - Cratering
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13 Oct 2003 Solar System - Dr. C.C. Lang 2 The Moon has no atmosphere allows us to see the surface with fine detail escape speed is too low on the Moon - all gas molecules can escape! no atmospheric pressure means that water can not exist in liquid form - only in solid or vapor temperature variations – extreme! - day T = 403 K = 266 F - night T = 93 K = -292 F - day/night are each 2 weeks long! no weathering of the surface by water, storm no protection from high energy solar particles, cosmic rays
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13 Oct 2003 Solar System - Dr. C.C. Lang 3 Lunar Geological Features 1.Craters ~30,000 visible with small telescopes from Earth millions visible from lunar orbiting satellites origin: interplanetary debris sizes: largest 100’s km across a result of fast moving impact rocks of only a few km’s across! large craters often produce “central peak” craters Clavius Crater diameter = 232 km depth of 16,000 feet
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13 Oct 2003 Solar System - Dr. C.C. Lang 4 2. Lunar “Maria” - dark, smooth regions first thought to actually be wet areas (before we knew Moon had no atmosphere) now believed to be smoother, younger (fewer craters) surfaces idea is that impacts created large basin and then lava flowed over surface relatively ‘low’ compared to highlands on moon; 2-5 km below other parts rough mountain ranges surrounding ‘maria’ suggest large impact originally evidence for ‘flows’ (lava?) along the smooth maria Lunar Geological Features
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13 Oct 2003 Solar System - Dr. C.C. Lang 5 3. Lunar Highlands most of moon (85%) is actually covered with lighter, higher land: Highlands predominantly on the side of the Moon facing away from Earth
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This note was uploaded on 02/16/2011 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.

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as3 - Solar System Planets: The Earth + Moon I. Moon -...

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