Final rehearsals for NASA's planetary defence test are already underway. The one-of-a-kind mission, which will launch next week, is set to intentionally crash a spacecraft into an asteroid to deflect its path. The Double Asteroid Redirection Test (DART) will attempt to hit the moonlet asteroid Dimorphos, which orbits a larger asteroid called Didymos.

source https://gadgets.ndtv.com/science/news/nasa-dart-asteroid-crash-blast-didymos-dimorphos-moonlet-launch-november-24-live-watch-livestream-twitter-instagram-2618141#rss-gadgets-all