Lect3 Meteorites Part II (09-01-09)

Lect3 Meteorites Part II (09-01-09) - For those that did...

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Dr Britt’s Gephysics Lectures http://physics.ucf.edu/~britt/Geophysics/ For those that did not take AST 3110
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Everyone needs to turn in a 1-2 page OUTLINE of the reading assignment due every Thurs., this will count toward the grade. I have already posted a review chapter on Meteorites, the assignment due Thurs. Sept. 10 is sections I and II in that chapter. Homework due every Thurs.
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I. Definitions II. Types III. Origin of Meteorites Intro to Meteorites
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Meteors and Meteorites. Meteor : atmospheric phenomenon produced by the entry of an interplanetary particle to Earth’s atmosphere. Also known as a shooting star Meteorite : when a solid object survives atmospheric entry and reaches Earth’s surface Most meteors are from comets Most meteorites are from asteroids I. Definitions
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Meteors
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I. Definitions II. Types III. Origin of Meteorites Intro to Meteorites
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Coarsest Classification: Irons Stony-Irons Stones (~75% of all meteorites) II. Types of Meteorites
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Iron Meteorite
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Stony-Iron
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Stony Meteorite
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II. Types of Meteorites Meteorite formed from material condensed and accreted from gas and dust in the solar nebula Primitive – Minimal processing Processed - Extensive compositional and mineralogical changes Coarsest Classification: Stones : Chondrites - primitive Achondrites - igneous Stony-Irons - igneous Irons - igneous
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Asteroids and comets accreted at different distances from the Sun, resulting in different compositions including ice contents Similarly within the asteroid belts there are compositional differences
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Irons Stony-Irons Stones (~75% of all meteorites) Chondrites Carbonaceous Enstatite Ordinary Achondrites II. Types of Meteorites
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Irons Stony-Irons Stones II. Types of Meteorites Iron Stone Differenciated Asteroid Undifferenciated Asteroid Iron and stone
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We stopped here on Aug. 27 2009
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Asteroids (more than 95%) Asteroids collide with each other and breakup, some of those fragments become meteorites Mars (a few percent) Impacts on Mars kick martian material into space and some ends up falling on Earth Moon (a few percent) Also because of impacts Comets? Venus? Mercury? So far no meteorites from these bodies have
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Lect3 Meteorites Part II (09-01-09) - For those that did...

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