Volcanoes on Mars ‘may be active’ BBC

Two of the oldest volcanoes on Mars, which were erupting over three billion years ago, may still be active. This startling conclusion is reached by geologists using new data from the Mars Global Surveyor spacecraft, currently orbiting the planet. The volcanoes, named Tyrrhena Patera and Hadriaca Patera, are located in the southern hemisphere of the Red Planet.