Astronomers, engineers, and NASA officials lay out what it actually takes to spot an asteroid before it hits Earth. The film follows the network of observatories scanning the sky for near-Earth objects, the scientists who calculate impact odds when a new object turns up, and the team behind NASA's DART mission, which deliberately crashed a spacecraft into the asteroid Dimorphos to test whether a collision can actually change an object's orbit. Interviews trace how that experiment's results get folded into real planetary defense planning, including how much warning time agencies would need to mount a response and what options exist if one did. The film also covers the less glamorous side of the work: cataloguing thousands of objects, ruling out false alarms, and coordinating between international observatories that rarely get public attention. It treats the threat as real but rare, focusing on the infrastructure built quietly over decades so that if a dangerous object is ever found, someone is already watching for it.