NASA’s Double Asteroid Redirection Test (DART),  the world’s first mission to test technology for defending Earth against potential asteroid or comet hazards, will impact its target asteroid

DART targeted the asteroid moonlet Dimorphos, a small body just 530 feet (160 meters) in diameter. It orbits a larger, 2,560-foot (780-meter) asteroid called Didymos. Neither asteroid poses a threat to Earth.

video down load link