There's an old joke that the dinosaurs are only extinct because they didn't develop a space agency. The implication, of course, is that unlike our reptilian ancestors, we humans might be able to save ...

HELSINKI — China will aim to alter the orbit of a potentially threatening asteroid with a kinetic impactor test as part of plans for a planetary defense system. China is drafting a planetary defense ...

The space probe came barreling in at thousands of miles per hour, its mechanical eyes locked on its target—an asteroid named Dimorphos. About an hour out, the asteroid looked to the probe’s cameras ...