Some scientists want to send messages into space in the hope of piquing alien interest. But might it attract the kind of attention no civilization wants?
A huge asteroid that could wipe out human life is heading for our planet. And it's just one of more than a half million near-Earth objects in our solar system.
Google has expanded its ability to keep an eye on everyone by buying "eye-in-the-sky" technology from Skybox.
Two House Democrats on Monday pitched a bill that would establish a national historical park on the lunar surface.