A “city killer” asteroid isn’t science fiction, it’s a real risk. Project Leader at The Aerospace Corporation Nahum Melamed explains that though these events are statistically rare, history shows they can happen. In 1908, a roughly 50-meter asteroid exploded over Siberia in what’s known as the Tunguska event, flattening more than 800 square miles of forest. Had that airburst occurred over a major metropolitan area, the destruction would have been instantaneous. Preventing that kind of devastatio

When was the last time an asteroid hit Earth? Small asteroids and other tiny particles bombard our planet daily, but almost all of them burn up safely in the atmosphere. Bigger impacts are extremely rare, but scientists like Marina Brozovic are keeping their eyes on the sky. Explore more: https://www.nasa.gov/planetarydefense | NASA - National Aeronautics and Space Administration