Cosmic Travelers: Comets and Asteroids (1997)

The outer space is full of comets and asteroids. This rock fragments, million years ago, gave to the humanity water and the necessary elements for the birth of the life on Earth, but too can they kill us with an impact against the surface of our planet more potent than a few hundred H-bombs. This documentary analyze the danger of the space rocks and to defeat using satellites armed with nuclear missiles, and finally too analyze the benefit of use it in the future space colonization, exploding them against other planets for create water in his surface and do them apt for the humanity, turning in our new homes.