Abstract
A top candidate for mankind's crowning achievement in this century would certainly be our ability to break free of Earth's gravity and travel through space.
As if there weren't enough unanswered questions about the history and mechanisms of our own Earth, we can now probe and ponder the inner workings of our neighboring planets, moons, asteroids, and visiting comets. Our questions range from the simple to the complex: "What are they made of?" "What geologic forces have acted on them?" "Could any of them support life now or in the past?"
