ASTR 151 1st Edition Lecture 15 Outline of Last Lecture I II III Chapter 7 Section 4 Surface Activity Continued Chapter 7 Section 5 Earth s Magnetosphere Chapter 7 Section 6 The Tide Outline of Current Lecture I Chapter 8 Section 1 Orbital Properties II Chapter 8 Section 2 Physical Properties III Chapter 8 Section 3 Surface Features of the Moon and Mercury IV Chapter 8 Section 4 Rotation Rates Current Lecture I Chapter 8 Section 1 Orbital Properties a Distance between Earth and Moon measured using Lasers b Mercury is never far from sun i Has phases ii Can be seen in it s max elongation 18 to 28 degrees between Earth and the Sun II Chapter 8 Section 2 Physical Properties a Moon i Radius 1738km Mass 7 3x10 22kg Density 3300 kg m3 escape speed 2 4km s ii No atmosphere or magnetic field 1 Due to air molecules move fast due to thermal motion 2 Average molecular speed is well below the escape velocity a Escapes more probable for lighter molecules iii Mercury does have a magnet field III Chapter 8 Section 3 Surface Features of the Moon and Mercury These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a Moon has dark features i Lava flow is called Maria was seen as oceans by early astronomers ii Maria result of basaltic eruptions b Moon has lots of Craters i From meteorite impacts ii Far side dark of the Moon has craters but no maria c Mercury has craters too but their impacts are less dense and shallow than the Moon s i Looks similar to our Moon ii Named after the patron god of financial gain and commerce d Mercury can t be seen from Earth due to the sun IV Chapter 8 Section 4 Rotation Rates a Moon is tidally locked onto the Earth b Arogee away and Perogee describes the Moon s orbit c Mercury s day and year are in a 3 2 resonance i It s tilt is the smallest tilt of all the planets ii Equator s temperature 700k iii Poles are cold 125
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