The author argues that Iran's pursuit of nuclear missiles underscores the threat to U.S. space assets.
A cadre of space scientists is becoming more adept at sorting out the swarm of asteroids and comets floating through the solar system and has turned its attention to the more-daunting job of doing something about the potentially disastrous collision with Earth.
Futuristic laser weapons under development by the U.S. military are making the transition from fodder for science fiction to reality and could soon be ready to play a major role in protecting troops on the battlefields of the 21st century.