One of the big surprises: Despite the moon's cooled crust, the data shows Io maintains liquid hot lava just below the ground.

Recent flybys of the fiery world refute a leading theory of its inner structure — and reveal how little is understood about ...

NASA’s Juno spacecraft has just delivered some exciting discoveries from Jupiter and its fiery moon, Io. The new findings, ...

Io is the third-largest natural satellite of Jupiter ... most volcanically active body in the Solar System, with about 400 volcanoes that continuously eject lava and gases. Read also: Asteroid ...

Io's north polar region as captured by Juno. Credit: NASA/JPL-Caltech/SwRI/Gerald Eichstädt Since 1979, when Voyager 1 first spotted volcanoes on Io, astronomers ...

Mars is about 140 million miles from our cozy planet. A human mission to that cold, rocky neighbor would mean being away from Earth for about 3 years. But the things those explorers would see and ...

New data from NASA's Juno mission has shed light on the dynamic atmosphere of Jupiter and the volcanic activity on ...