Mars may not be as geologically quiet as scientists once believed. A remarkable discovery involving hydrogen chloride gas detected near the massive Alba Mons volcano is raising new questions about whether volcanic activity could still be occurring beneath the Red Planet's surface. An international team of researchers has identified unusual concentrations of hydrogen chloride (HCl) in the Martian atmosphere above a region containing volcanic fissures. The discovery, made using observations from the European Space Agency's ExoMars Trace Gas Orbiter, suggests...Click for full post