Chapter 9 Notes - ISP 205 Chapter 9 Page 1 9.1 Asteroids and Meteorites I Differences and Similarities A Asteroids rocky leftover plantesimals that

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ISP 205 - Chapter 9 Page 1 9.1 Asteroids and Meteorites I. Differences and Similarities A. Asteroids – rocky leftover plantesimals that couldn’t become part of a planet 1. Undetectable to the naked eye 2. Move relative to the stars 3. Wide ranges of sizes – largest Ceres 4. Don’t make up much in total mass B. Meteorites – pieces of rock that have fallen to ground II. Why is there an Asteroid belt? A. Only place they could survive where they did not accrete into a planet B. Resonances with Jupiter 1. Kirkwood gaps – asteroids tend to share a few particular orbital periods and distances a. not random b. bear special and simple relationships to Jupiter’s nearly 12 year orbital period c. Orbital Resonances whenever objects periodically line up with each other so that gravity affects them over and over again in the same way 2. Asteroids with orbital periods that are fractions of Jupiter’s are nudges by Jupiter’s gravity – pushed out of 6 year orbit C. Jupiter’s Role in the Asteroid Belt 1. Jupiter’s gravity through the influence of orbital resonances, stirred up asteroid orbits and thereby prevented their accretion into a planet 2. Jupiter’s gravity is causing collision amongst asteroids and planets III. How are meteorites related to asteroids? A. Difference between Meteors and Meteorites 1. Meteor – flash of light causes by a particle entering our atmosphere at high speed (not a particle) 2. Rarely are meteors caused by something large enough to survive the plunging through the atmosphere and leave a meteorite – fireballs 3. Meteorite Clues a. covered with a dark pitted crust b. High metal content c. Contain elements such as Iridium B. Types of Meteorites 1. Primitive meteorites a. rock and metal, sometimes carbon compounds and water b. under 4.6 billion years old, remnants from birth of solar system c. unchanged since formed in solar nebula
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This note was uploaded on 03/19/2008 for the course ISP 205 taught by Professor Donahue during the Spring '08 term at Michigan State University.

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Chapter 9 Notes - ISP 205 Chapter 9 Page 1 9.1 Asteroids and Meteorites I Differences and Similarities A Asteroids rocky leftover plantesimals that

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