Arsia Mons itself measures 435km (270 miles) in diameter and rises more than 9km (5.5 miles) above the surrounding plains. For context, the highest dormant volcano on Earth, Ojos del Salado on ...

NASA Odyssey orbiter snapped a first-ever image of a Mars volcano peeking above clouds before dawn. It’s twice as tall as Earth’s largest volcano.

Because of its cloud cover, Arsia Mons has been hard to photograph. This new image from NASA's 2001 Mars Odyssey orbiter gives a first-of-its kind view at the peak of the volcano.

Arsia Mons is the southernmost volcano in a group of three massive Martian volcanoes known collectively as Tharsis Montes. Until now, the volcano’s history has remained a mystery.

Arsia Mons, though not as tall as Olympus Mons, dominates the Martian landscape with its 12-mile (20 km) height. Located in the Tharsis Montes volcanic region, this volcano is often shrouded in ...

The volcano Arsia Mons, while still active, was covered by an enormous glacier around 210 million years ago. The volcano Arsia Mons, while still active, ...

Volcanic activity in Arsia Mons — the southernmost member of the Tharsis Montes group — most likely peaked roughly 150 million years ago.

But the reality is that it's been at least 10 million years since the formidable Arsia Mons erupted.It must have been a pretty remarkable eruption, too, as the volcano is an incredible 270 miles ...

Arsia Mons produced one new lava flow at its summit every 1 to 3 million years during the final peak of activity, about 50 million years ago. The last volcanic activity there ceased about 50 ...

Microbial life could potentially have thrived for a time at the foot of Arsia Mons, a giant volcano about twice as tall as Mt. Everest, while the dinosaurs were just coming into their own on Earth ...