https://www.vice.com/en_us/article/akendp/watch-nasa-dart-test-live

A spacecraft will deliberately crash into an asteroid at 14,000 miles per hour on Monday in what will be the very first test of a planetary defense strategy to alter the trajectories of dangerous space rocks that could one day collide with Earth.

Launched in 2021, NASA’s Double Asteroid Redirection Test (DART) is now closing in on a half-mile-wide asteroid called Didymos, which is orbited by an even smaller asteroid called Dimorphos, or “Didymoon.”