In 2029, the asteroid Apophis will skim past Earth closer than many communication satellites, turning a once-feared impact threat into a rare natural experiment in planetary defense. As space agencies ...

A niche corner of the commercial space sector is attracting attention from United States national security planners, not because of its economic promise, but because of the technical problems it is ...

Add Yahoo as a preferred source to see more of our stories on Google. An asteroid that scientists initially feared might pose a risk to Earth may could instead strike the moon in 2032, according to ...