A NASA spacecraft orbiting Jupiter has just witnessed some of the most extreme volcanic eruptions ever seen in the solar system, coming from a giant underground magma chamber on the "tormented" Jovian moon Io. The energy pouring from this record-breaking hot spot far exceeds the amount of power we are producing on Earth, researchers say. Io is Jupiter's third-largest moon, spanning roughly 2,300 miles (3,700 kilometers) across, which makes it slightly bigger than Earth's moon. It orbits Jupiter at a distance of around 262,000 miles (422,000 km) — also similar to how far away the moon orbits Earth — but...