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

They went looking for lava tubes on Mars — and found what may be a hole in the roof of a Martian cave.

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?

The spectacular features visible today on the surface of the Red Planet indicate the past existence of Martian glaciers, but where did the ice come from?