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There are approximately 25,000 "city killer" asteroids in near-Earth orbit--and most are yet to be found. Small enough to evade detection, they are capable of large-scale destruction, and represent our greatest cosmic threat. But in September 2022, against all odds, NASA's... Read Full Overview

A gripping account of the "city-killer" asteroids that could threaten Earth and the race to build a planetary defense system. There are approximately 25,000 "city killer" asteroids in near-Earth orbit--and most are yet to be found. Small enough to evade detection, they... Read Full Overview

A gripping account of the "city-killer" asteroids that could threaten Earth and the race to build a planetary defense system. There are approximately 25,000 "city killer" asteroids in near-Earth orbit--and most are yet to be found. Small enough to evade detection, they... Read Full Overview

There are approximately 25,000 "city killer" asteroids in near-Earth orbit--and most are yet to be found. Small enough to evade detection, they are capable of large-scale destruction, and represent our greatest cosmic threat. But in September 2022, against all odds, NASA's... Read Full Overview