Infrared data collected by NASA’s Juno spacecraft point to a new heat source in the southern hemisphere of Io — Jupiter’s third-largest moon — that could indicate a previously undiscovered volcano. This image from NASA’s Galileo spacecraft shows a volcanic explosion on Io. Image credit: NASA / JPL / University of Arizon. Io — the innermost of the four Galilean moons of Jupiter and the fourth-largest moon in our Solar System...
