Supervolcanoes! Mars Had ‘Em; So Could We
It’s no news that Mars is teeming with extinct volcanoes. The biggest, Olympus Mons, towers some three times higher than Mount Everest, spreads so wide that it could cover most of France and is so prominent that its snowy summit was first spotted from Earth in the late 1800’s. Astronomers now know of literally thousands of smaller volcanoes as well, sprinkled liberally around the Red Planet, some of them as much as 3.5 billion years old.