It’s a big solar system out there, and it’s filled not only with planets and moons, but also with hundreds of thousands smaller chunks of rock and ice. Most of these asteroids and comets orbit the Sun without ever coming near Earth, but impacts can happen. For decades, NASA has been on the lookout for any that could harm planet and, in the thousands of objects found, determined that none poses a threat to Earth. Tune in to learn about how we hunt for asteroids and comets that might threaten Earth.