NASA Is Going To Try To Re-Direct The Path Of An Asteroid By Crashing A Spacecraft Into It - Jalopnik
See, Dimorphos is part of a binary pair of asteroids and orbits around the asteroid Didymos, so NASA can tell if the impact of DART into Dimorphos affected its orbit around Didymos.
It can then use that information to calculate how a similar strike to an asteroid potentially headed to Earth could be deflected.
The spacecraft is small and boxy, and it will hit Dimorphos at an impressive 14,760 mph, sped along by its NEXT xenon ion thruster engine, which converts solar energy into gradual but persistent thrust.