Olympus Mons, a shield volcano on Mars, is the largest volcano in the solar system, measuring approximately 370 miles in diameter and 26 kilometers in height. The formation of Olympus Mons and three ...

Astronauts train to scale a Mars volcano at an analogue site in France. Lava tubes that crisscross the Martian surface might provide sanctuaries for the first human explorers on the Red Planet. (Photo ...

Even though the Red Planet's atmosphere is thin, wind is still one of Mars' most relentless sculptors.

Scientists have discovered a mysterious hole on the surface of Mars, and they have no idea what lies inside it. This pit, located in the Arsia Mons region — one of Mars’ giant volcanoes — could ...