1. Chapter 11:Small Bodies Orbiting the Sun

2. Kuiper Belt The Kuiper Belt of comets spreads from Neptune out 50 AU from the Sun

3. Oort Comet Cloud

4. A. icy dirtball? B. dirty snowball? or Comets

5. Composition of a Comet

7. Comets lack tails until they enter the inner solar system.

8. Halley’s Comet Period of orbit is 74-79 years predicted by Edmond Halley Nucleus very dark Dirty snowball!

9. Halley’s Comet “I came in with Halley’s comet in 1835. It is expecting to come again next year (1910), and I expect to go out with it. The Almighty has said no doubt: ‘ Now here are two unaccountable freaks; they Came in together, they must go out Together.” - Mark Twain, a Biography

10. Meteor Showers

13. Meteroids meteroids: chunks of matter in space orbiting in the Solar System ranging up to tens of meters across and sometimes larger meteors: when these chunks hit the Earth’s atmosphere and show up as streaks in the sky meteorite: when a fragment of a meteoroid survives its passage through the Earth’s atmosphere

14. Meteorites

16. Asteroids Gaspra Ida and its moon Dactyl

17. Ceres was the largest Asteroid, now it’s a Dwarf Planet

18. Most asteroids orbit the Sun between Mars and Jupiter

20. The Extinction of Dinosaurs