How many moons does Jupiter have? Scientists have discovered dozens of them, but the answer may be more complicated than it seems.

Some minerals in lava could suggest water is nearby.

Io is Jupiter’s third-largest moon. As the moon is subjected to tremendous gravitational forces, its surface bulges up and down by, and is the most volcanically active body in our solar system.

The Hubble Space Telescope has spotted what appear to be geysers erupting from the surface ... the four so-called Galilean moons of Jupiter, along with Ganymede, Io and Callisto.

NASA's Juno spacecraft captured an image of Jupiter's moon Io, partially illuminated by sunlight ... revealing rust-colored stripes on its icy surface. Juno's 38th close flyby of Jupiter captured an ...

The Hubble Space Telescope has spotted what appear to be geysers erupting from the surface ... the four so-called Galilean moons of Jupiter, along with Ganymede, Io and Callisto.

Similarly, Jupiter's moons Io and Europa have a 2:1 resonance (for ... enough tidal forces to sustain an ocean beneath Europa's surface. Miranda eventually fell out of sync with one of the other ...

“To find evidence of an ocean inside a small object like Miranda is incredibly surprising,” said Tom Nordheim, a planetary ...

Related: NASA reveals 'glass-smooth lake of cooling lava' on surface of Jupiter's moon Io Each of Jupiter's other 91 official ...