That's definitely not changing." Robert Hooke and Giovanni Cassini, two of the leading astronomers in the 1600s, both noted ...

Flybys of Jupiter’s moon Io, the only known volcanic world in our solar system, have captured images of a massive lava lake ...

A new animation reveals an enormous lava lake on the surface of Jupiter's moon Io.

Since 2016, the NASA mission has captured some awe-inspiring views of alien worlds and promising venues for alien life.

NASA's Juno spacecraft found Io’s surface is as smooth as glass, just like volcanically created obsidian glass ...

NASA’s Juno spacecraft, which first arrived to study Jupiter and its moons in 2016, flew within roughly 930 miles (1,500 kilometers) of the lava world’s surface in December and February to ...

Bolton said he often refers to Io as "Jupiter's tortured moon" because of the ferocious forces it regularly encounters.The forces exerted on Io by Jupiter, Europa and Ganymede cause Io's surface ...