The Near-Earth Object Program coordinates NASA-sponsored efforts to detect, track and characterize potentially hazardous asteroids and comets larger than one kilometer in diameter that could approach the Earth.
NASA's missions to comets, asteroids and other small bodies are revealing clues about the solar system's early history and evolution and how life came to exist on Earth.
Learn more about asteroids and comets, play a physics based asteroid game or hit any spot in the world with an asteroid using the Google Earth Impact simulation.