NASA's Mars Reconnaissance Orbiter has revealed that movement in sand dune fields on the Red Planet occurs on a surprisingly large scale, about the same as in dune fields on Earth.

One of the supposedly best understood and least interesting landscapes on Mars is hiding something that could rewrite the planet’s history. Or not.

Minerals in northern Mars craters seen by two orbiters suggest that a phase in Mars' early history with conditions favorable to life occurred globally, not just in the south.

Spectacular satellite images suggest that Mars was warm enough to sustain lakes three billion years ago, a period that was previously thought to be too cold and arid to sustain water on the surface.

By AARON MACKEY Mars may have had water coursing through its red soil for a billion years longer than scientists previously had thought, increasing the possibility that the planet could have supported life, research conducted by a Tucson-based institute shows.