1. What evidence in Figure 9-33 supports the labeling of the gas and dust tails? 2. Would you expect the surfaces of Pluto and Charon to be heavily cratered? Explain. 3. Why are comets generally...

1. What evidence in Figure 9-33 supports the labeling of the gas and dust tails?

2. Would you expect the surfaces of Pluto and Charon to be heavily cratered? Explain.

3. Why are comets generally brighter after passing perihelion (closest approach to the Sun) than before reaching perihelion?