NASA on Monday successfully struck a tiny asteroid more than 7 million miles from Earth with a 1,000-pound spacecraft, completing the world’s first planetary defense mission. The Double Asteroid Redirection Test (DART) spacecraft slammed into the asteroid Dimorphos at roughly 7:14 p.m. ET at a speed of more than 14,000 miles per hour. It’s the … Continue reading NASA strikes asteroid with spacecraft in historic planetary defense mission