Lecture Outlines. Chapter 8. Astronomy Today 7th Edition Chaisson/McMillan Pearson Education, Inc.
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1 Lecture Outlines Chapter 8 Astronomy Today 7th Edition Chaisson/McMillan
2 Chapter 8 The Moon and Mercury
3 Units of Chapter Orbital Properties 8.2 Physical Properties 8.3 Surface Features on the Moon and Mercury 8.4 Rotation Rates Lunar Exploration Why Air Sticks Around 8.5 Lunar Cratering and Surface Composition
4 Units of Chapter 8 (cont.) 8.6 The Surface of Mercury 8.7 Interiors 8.8 The Origin of the Moon 8.9 Evolutionary History of the Moon and Mercury
5 8.1 Orbital Properties Distance between Earth and Moon has been measured to accuracy of a few centimeters using lasers Viewed from Earth, Mercury is never far from the Sun
6 8.1 Orbital Properties Phases of Mercury can be seen best when Mercury is at its maximum elongation
7 8.2 Physical Properties Moon Mercury Earth Radius 1738 km 2440 km 6380 km Mass kg kg kg Density 3300 kg/m kg/m kg/m 3 Escape Speed 2.4 km/s 4.2 km/s 11.2 km/s
8 8.3 Surface Features on the Moon and Mercury Moon has large dark flat areas, due to lava flow, called maria (early observers thought they were oceans)
9 8.3 Surface Features on the Moon and Mercury Moon also has many craters (from meteorite impacts)
10 8.3 Surface Features on the Moon and Mercury Far side of Moon has some craters but no maria
11 8.3 Surface Features on the Moon and Mercury Mercury cannot be imaged well from Earth; best pictures are from Messenger
12 8.3 Surface Features on the Moon and Mercury Cratering on Mercury is similar to that on Moon
13 8.4 Rotation Rates Moon is tidally locked to Earth its rotation rate is the same as the time it takes to make one revolution, so the same side of the Moon always faces Earth
14 8.4 Rotation Rates Mercury was long thought to be tidally locked to the Sun; measurements in 1965 showed this to be false. Rather, Mercury s day and year are in a 3:2 resonance; Mercury rotates three times while going around the Sun twice.
15 Discovery 8-1: Lunar Exploration Soviets had first contact with Moon: First spacecraft to fly past Moon: January 1959 First spacecraft to (crash) land on Moon: September 1959 First pictures of far side of Moon: October 1959 The United States is (so far) the only country to send people to the Moon: First person on Moon: July 1969 Last person on Moon: December 1972
16 More Precisely 8-1: Why Air Sticks Around Air molecules have high speeds due to thermal motion. If the average molecular speed is well below the escape velocity, few molecules will escape. Escape becomes more probable: For lighter molecules (higher speed for same kinetic energy) At higher temperatures For smaller planets (escape speed is less)
17 More Precisely 8-1: Why Air Sticks Around Molecules in a gas have a range of speeds; the fastest (and those that are headed in the right direction) will escape
18 8.5 Lunar Cratering and Surface Composition Meteoroid strikes Moon, ejecting material; explosion ejects more material, leaving crater
19 8.5 Lunar Cratering and Surface Composition Craters are typically about 10 times as wide as the meteoroid creating them, and twice as deep Rock is pulverized to a much greater depth Most lunar craters date to at least 3.9 billion years ago; much less bombardment since then
20 8.5 Lunar Cratering and Surface Composition Craters come in all sizes, from the very large
21 8.5 Lunar Cratering and Surface Composition to the very small
22 8.5 Lunar Cratering and Surface Composition Regolith: Thick layer of dust left by meteorite impacts Moon is still being bombarded, especially by very small micrometeoroids ; softens features
23 8.5 Lunar Cratering and Surface Composition Meteorites also hit Earth; this crater is in Arizona
24 8.5 Lunar Cratering and Surface Composition More than 3 billion years ago, the moon was volcanically active; the rille here was formed then
25 8.6 The Surface of Mercury Mercury is less heavily cratered than the Moon Some distinctive features: Scarp (cliff), several hundred kilometers long and up to 3 km high
26 8.6 The Surface of Mercury Caloris Basin, very large impact feature on opposite side of planet
27 8.6 The Surface of Mercury Weird terrain is thought to result from focusing of seismic waves
28 8.7 Interiors Moon s density is relatively low, and it has no magnetic field cannot have sizable iron/nickel core Crust is much thicker than Earth s
29 8.7 Interiors Mercury is much denser than the Moon and has a weak magnetic field not well understood!
30 8.8 The Origin of the Moon Current theory of Moon s origin: Glancing impact of Mars-sized body on the still-liquid Earth caused enough material, mostly from the mantle, to be ejected to form the Moon Computer model
31 8.9 Evolutionary History of the Time before present Moon and Mercury Event 4.6 billion yr Formation of Moon; heavy bombardment liquefies surface 3.9 billion yr Bombardment much less intense; lunar volcanism fills maria 3.2 billion yr Volcanic activity ceases
32 8.9 Evolutionary History of the Moon and Mercury Mercury much less well understood Formed about 4.6 billion years ago Melted due to bombardment, cooled slowly Shrank, crumpling crust
33 Summary of Chapter 8 Main surface features on Moon: maria, highlands Both heavily cratered Both have no atmosphere, and large day night temperature excursions Tidal interactions responsible for synchronicity of Moon s orbit, and resonance of Mercury s
34 Summary of Chapter 8 (cont.) Moon s surface has both rocky and dusty material Evidence for volcanic activity Mercury has no maria but does have extensive intercrater plains and scarps
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