If you’re worried about a killer asteroid wiping out Earth, NASA has some good news.
The U.S. space agency said Thursday it has identified more than 90 per cent of giant, potentially Earth-threatening asteroids, including ones as big as the one thought to have killed the dinosaurs eons ago.
“We know now where most of them are and where most of them are going. That really has reduced our risk” of an impact, said Amy Mainzer of the NASA Jet Propulsion...