1. Remnants of Rock and Ice Asteroid: a rocky leftover planetesimal Comet: an icy leftover planetesimal Meteoroid: a planetesimal or other object that lands on Earth –Meteor (shooting star): a flash of light caused by a meteoroid entering the atmosphere –Meteorite: a piece of meteoroid that reaches the ground (rocky or metallic material)

2. Cratering by Meteoroid

3. Measuring Mass of an Asteroid

4. Primitive (Mixed) Meteorites

5. Processed Meteorites

6. Asteroid Location

7. Questions: Where did all the leftover planetesimals outside the belt go? Why are there Trojan Asteroids? Why are there asteroids in the belt instead of another planet?

8. Orbital Resonance

9. Asteroid Hunting

10. Asteroids Materials

11. Rotation and Shape of Asteroids

12. The Biggest Asteroids

13. Comets Comets melt when they come within 5 AU of the Sun. Ice sublimates forming the coma (gas and dust atmosphere) Two tails caused by material from coma Dust tail caused by sunlight and plasma tail caused by solar wind

14. Comet Orbits

15. Sources of Comets

16. Pluto and Its Moon

17. Pluto’s Closest Approach

18. Orbits of Pluto and Charon

19. Pluto and Charon

20. Pluto in True Color

21. Large Impactor

22. Rate of Impactors

23. Meteor Showers