Lecture_6_1-24_-1

Lecture_6_1-24_-1 - Midterm 1 Tues Office hours:...

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Midterm 1 Tues Office hours: No office hour Tues afternoon or Wed Optional Observational Trips: Stunt Ranch Tues Eve (weather prediction is not promising) Final Chance the following Saturday
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Solar System edge-on
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Similar to Fig 4.3 in text
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Terrestrial and Jovian Planets
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Asteroids • Belt of thousands of small rocky objects between Mars and Jupiter • Largest Ceres is 1/4 diameter of Moon -- accounts for 30% of total mass of all asteroids • Three are as large as 300 Km • 200 bigger than 100 Km • Trojan asteroids lead and follow Jupiter by 60 o • Smaller ones may strike Earth occasionally
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• Chunks of dirty ice several kilometers in size •F r o m Kuiper belt -- plane of ecliptic beyond Pluto •o r Oort Cloud , spherical cloud of billions of comet nuclei out to one light year or so • Tail points away from Sun; ion tail driven directly away by solar wind; dust tail pushed by radiation pressure curves toward comet orbit. • Comet may be deviated by a planet, usually
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Lecture_6_1-24_-1 - Midterm 1 Tues Office hours:...

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