Video Caption: NASA is crashing a spacecraft into an asteroid… on purpose! Our #DARTmission is a first-of-its-kind #PlanetaryDefense test to change the motion of an asteroid in space so that we could use this technique if an asteroid were ever discovered to be a threat to Earth. Follow DART: www.nasa.gov/DART
The DART mission is a test of a technique that could be used to mitigate the threat of an asteroid on a collision course with Earth should one be discovered in the future. DART’s target is not a threat to Earth. While no known asteroid larger than 140 meters in size has a significant chance to hit Earth for the next 100 years, only about 40 percent of those asteroids have been found as of October 2021.