492-pp3 - UNIVERSITY OF SOUTH ALABAMA Last time. Origin of...

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1 ES 492 (H): Planetary Geology Lecture 3: Asteroids (with apologies to Atari Games) UNIVERSITY OF SOUTH ALABAMA Origin of sediment Last time… The Earth-Moon System 1. Formation and differentiation of the Earth 2. Formation of the moon (4 hypotheses) 3. Geology of the moon Cold versus Hot Accretion ht p:/ www.videolife.tk/accretion/ Hot Accretion: The Earth remained molten as it grew Cold versus Hot Accretion Cold Accretion: The Earth was “clumpy” as it grew ht p:/ scienceclass.ning.com/profiles/blogs/1677792:BlogPost:3043 Cold versus Hot Accretion Cold Accretion requires a secondary melting event; the Big Burp Source: http://spaceflightnow.com/news/n0108/15mooncreate/ “Glancing blow” impact sometime before 4.1 Ga Origin of the Earth- Moon System
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2 The Impact cratering The Moon Lunar Geology Near Side Far Side Today’s Agenda 1. What are asteroids 2. How are they classified 3. Close encounters of the asteroid kind Asteroids •There are millions* of small rocks that orbit the Sun, most of them between the orbits of Mars and Jupiter. *estimates vary from 100’s of thousands to millions Asteroids •Those smaller than about 300 kilometers across have irregular shapes because their internal gravity is not strong enough to compress the rock into a spherical shape.
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3 Asteroids •The largest asteroid is Ceres with a diameter of 1000 kilometers. Asteroids
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This note was uploaded on 02/05/2012 for the course ES 492 taught by Professor Staff during the Summer '11 term at S. Alabama.

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492-pp3 - UNIVERSITY OF SOUTH ALABAMA Last time. Origin of...

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