CAPE CANAVERAL, Fla. — An asteroid that NASA used for target practice a few years ago was nudged into a slightly different route around the sun, findings that could help divert a future incoming ...

Planetary defense has moved from science fiction to a live engineering problem, and the stakes could not be higher. The central question is no longer whether an asteroid will eventually head our way, ...

WASHINGTON — New observations of a small asteroid discovered in December have led astronomers to conclude that the chances of it striking Earth are almost zero after earlier data had indicated a ...