The car-sized Curiosity rover has spotted evidence of once quite hospitable environs on Mars.

I’m one of a team of more than 500 travelers exploring Mars from California with the most sophisticated robot ever sent to another planet. As I write, Curiosity is pounding a hole into a rock in ...

The extraordinary landing of a revolutionary rover named Curiosity—which successfully ... in the form of the most sophisticated robot ever to rove the Mars surface. Will NASA's bold mission ...