Problem 17
What is the eventual fate of most short-period and long-period comets?
Problem 18
What is the relationship between comets and meteor showers?
Problem 19
What evidence do we have that comets are permanent solar system members rather than interlopers from other parts of the galaxy?
Problem 20
Suppose the Earth were struck by an asteroid \(10 \mathrm{km}\) in diameter. Describe the local and global consequences of the impact.
