NASA Gives New Name to First Planetary Defense Mission Target

NASA is gearing up for its first planetary defense mission, Double Asteroid Redirection Test (DART). The target is the moon of a near-Earth asteroid that was discovered close to two decades ago. It's been given the unofficial name of "Didymos B" since its finding -- "Didymos" is Greek for "twin" -- as a nod to its binary system with the asteroid.DART is projected to happen as soon as 2022, and it will be the "first full-scale demonstration of an asteroid deflection technology for planetary defen...