Images from a 2D Spheral simulation showing the fragmentation of the Chelyabinsk bolide as it descends through the atmosphere. Credit: LLNL Planetary Defense program Images from a 2D Spheral ...

(AP) Scientists studying the terrifying meteor that exploded without warning over a Russian city last winter say the threat of space rocks smashing into Earth is bigger than they thought. Meteors ...

Chunks of rock fall from space all the time, some of them big enough to do a fair amount of damage. Most of the time, however, nobody’s the wiser: the vast majority of Earth’s surface is ocean, desert ...