Mission Asteroid A killer asteroid is on its way to Earth -- what can we really do to stop it? Are we destined to go the way of the dinosaur? Killer asteroids have long played a role in science fiction. But when a fireball exploded over Chelyabinsk, Russia in 2013, the world learned that the threat is real. On average, NASA finds a new potentially hazardous asteroid every day... and there are still many we haven’t found. Many of these space rocks have the power to destroy cities, and some are bi...
