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. 

On July 20, 1969 three U.S. astronauts landed on the moon, and now NASA wants to go to Mars — for all the benefits — disregarding all the costs.

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.

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