Mars isn't dead — recent volcanic activity reveals it's just sleeping

Scientists have long suspected that Mars is geologically "dead," but new spacecraft observations suggest the Red Planet's volcanoes are merely sleeping.That means that Olympus Mons, the extinct Martian volcano that at around 16 miles (26 kilometers) above the surrounding Martian plains is the largest mountain in the solar system, may in fact be a slumbering giant.The observations were made with the European Space Agency (ESA) mission ExoMars Trace Gas Orbiter (TGO) as it studied volcanic fissure