Asteroids hit Earth all the time. Most of them are so small that they burn up in the atmosphere. But a few either explode in the air or slam into the surface. That can cause damage ranging from broken windows to extinction of most of Earth’s life. So scientists have been working on ways to protect us from potential impacts. If an asteroid or comet is far enough out, we might be able to nudge it into a safe orbit. If it’s closer, we might have to nuke it. And a new idea is designed to save us from impacts that are weeks or even hours away. The concept is headed by Philip Lubin of the University of California-Santa Barbara. It would deploy “kill vehicles” in Earth orbit or on the Moon. If an asteroid or comet was detected on a collision course with Earth, a vehicle would intercept it. It would blast out thousands of tiny bits of shrapnel. They’d tear into the object, ripping it apart. The fragments would either miss Earth or enter the atmosphere and burn up. NASA has funded a study of th
