The Earth is constantly under threat from asteroids, ranging from small, frequent impacts to massive, civilization-ending events. Scientists are working to understand the true scale of this danger, analyzing evidence from past impacts like the Tunguska event and the mysterious disappearance of the Clovis culture. As researchers develop new technologies to track and potentially deflect these celestial threats, the race is on to ensure our planet is prepared for the next inevitable encounter with a space-borne killer.