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Announcements

Announcements. Pick up tests Test solutions posted near SL south door Turn in Homework 6 if you haven’t already Pick up Homework 7 First project due Friday, 5:00 p.m. Pluto and Solar System Debris. 11 October 2006. Today:. Pluto: the 9th planet(?) Other stuff near Pluto and beyond

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Announcements

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  1. Announcements • Pick up tests • Test solutions posted near SL south door • Turn in Homework 6 if you haven’t already • Pick up Homework 7 • First project due Friday, 5:00 p.m.

  2. Pluto and Solar System Debris 11 October 2006

  3. Today: • Pluto: the 9th planet(?) • Other stuff near Pluto and beyond • Comets • Minor planets in inner solar system (asteroids) • Earth impacts

  4. Pluto • Discovered in 1930 by comparing photos taken at different times • Slightly farther than Neptune, in tipped, eccentric orbit • Smaller than our moon • Has one moon, Charon • Robotic mission launched January, 2006; will fly by in July, 2015

  5. Kuiper Belt objects(stuff beyond Neptune) • Seem to be quite numerous • Largest known so far is Eris (fka Xena) • Comets come from out here (or farther)

  6. Comets • Chunks of rock and ice in highly eccentric orbits • Near sun, ice evaporates to produce “tail” • A couple have been visited by robotic craft

  7. Comets

  8. Halley’s Comet

  9. Asteroids (minor planets) • Most abundant between the orbits of Mars and Jupiter • Largest is Ceres, 800 km diameter; most are much smaller, irregular

  10. Asteroids (minor planets)

  11. Comet Shoemaker-Shoemaker-Levy 9

  12. Comet and Asteroid Impacts

  13. Meteor Showers (These occur when earth passes through cloud of debris along a comet’s orbit.)

  14. The Outer Solar System Neptune On this scale: 1 A.U. = 7 pixels Orbital radii: Jupiter 5.2 A.U. Saturn 9.5 A.U. Uranus 19 A.U. Neptune 30 A.U. Uranus Saturn Jupiter

  15. The Inner Solar System Mars Earth On this scale: 1 A.U. = 120 pixels Diam. of Sun = 1 pixel Diam. of moon’s orbit = 1/2 pixel Diam. of earth = 1/100 pixel Venus Mercury Sun

  16. Earth and Moon to scale

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