explanation of what was seen in other videos: the world's first planetary defense test, the Double Asteroid Redirection Test. At 7:14pm ET, DART’s impact will slow Dimorphos down, which will make it orbit Didymos faster. This technique could save Earth on

explanation of what was seen in other videos: the world's first planetary defense test, the Double Asteroid Redirection Test. At 7:14pm ET, DART’s impact will slow Dimorphos down, which will make it orbit Didymos faster. This technique could save Earth on