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Learning lesson

by: Mile

Learning lesson AST 111

Intro/Solar Systems Astronomy

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About this Document

lesson 13
Intro/Solar Systems Astronomy
Class Notes
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This 1 page Class Notes was uploaded by Mile on Monday October 26, 2015. The Class Notes belongs to AST 111 at Arizona State University taught by Bowman in Fall 2015. Since its upload, it has received 40 views. For similar materials see Intro/Solar Systems Astronomy in Astronomy at Arizona State University.


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Date Created: 10/26/15
AST 111 Lecture 13 The Moon and MercuryIVenusIMars The Moon s Magnetism There is no global magnetic field on the moon There used to be as evident by the residual magnetism in the rocks New research shows that the moon has a massive mantle and small liquid iron center and an even smaller solid iron core 0 The crust density varies from the close side of the moon to the far side 0 The thick mantle and crust form a very thick lithosphere The moon has no surface activity like plate tectonics or volcanism There are moonquakes 0 They happen very very far down near the molten region 0 Another reason for recorded seismic activity could be asteroidscometssatellites crashing on to the moon The moon s crust Covered in REGOLITH aka biologically dead moon dust All Lunar rocks are Igneous formed by the solidification of molten material Some of these rocks are known as anorthosites and they can be older than 4 billion years the younger rocks are much like the volcanic rocks on earth and are found in the Marae MercuryVenusMars can all be seen with the naked eye Mercury 0 Very illusive and difficult to see 0 At most elongation of Mercury is only 28D 0 The best time to view it is at greatest elongation o The best way to view it is to use filters on a telescope and view it during the day when it is high in the sky Venus o The best elongation is about 47D 0 At greatest brilliance it is the 3rd brightest object in the sky This happens because it is cloud covered and very reflective close to the sun and close to the earth Mars 0 Is a superior planet so it can be observed at opposition when it is very high in the sky 0 A favorable opposition appears every 1517 years Rotations Mercury 0 has a 32 spinorbit ratio Venus 0 Very unusual rotation o Rotates very slowly with a sidereal period of 243 days 0 The sidereal period is 224 days so it takes more than one revolution to rotate once 0 It also rotates RETROGRADE


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