Mars Express has helped to unveil volcanic history of the Red Planet, providing more insight as to what lies underneath our celestial neighbor.

CU-Boulder Study Provides Possible Explanation for Migration of Volcanic Activity on Mars

Is Mars dead, or is it only sleeping? The surface of Mars is completely hostile to life as we know it. But there is evidence that Mars once was a warm and wet world that could have supported life. Are the best times over, at least for life, on Mars?

A JPL-managed orbiter has found entrances to seven possible caves on the slopes of a Martian volcano, fueling interest in potential underground "habitats" and sparking searches for caverns elsewhere on the red planet, NASA reported Friday.

Mars Odyssey has discovered entrances to seven possible caves on the slopes of a Martian volcano. The find is fueling interest in potential underground habitats and sparking searches for caverns elsewhere on the Red Planet.