1. To test your understanding of the asteroid belt, do Interactive Exercise 9-1 on the Web. You can print out your results, if required. 2. Why are there many small asteroids but only a few very large...

1. To test your understanding of the asteroid belt, do Interactive Exercise 9-1 on the Web. You can print out your results, if required.

2. Why are there many small asteroids but only a few very large ones?

3. Describe the different chemistry of the two tails of a comet.

4. In what directions to comet tails point, and why?