Illustration of the Jovian moon Io, seen against the backdrop of Jupiter's Great Red Spot. The latter is a vast, cyclonic storm - wider than the entire Earth - that has raged for centuries. Io, a highly volcanic world, is the innermost Galilean moon...

Artwork of Jupiter seen from Europa

Geyser on Europa, illustration. Europa is the smallest of the four Galilean moons of Jupiter, and the second closest to the planet. Its surface is icy and relatively smooth. Impacting meteorites cause melting of the surface, allowing the water to...

Geyser on Europa, illustration

Jupiter seen from Europa, illustration. Europa is the smallest of the four Galilean moons of Jupiter, and the second closest to the planet. Its surface is icy and relatively smooth. Impacting meteorites cause melting of the surface, allowing the water...

A ringed blue gas giant with shepherd moon in the rings.

Artist's concept of Neptune as seen from its largest moon Triton.

Artist's concept of Jupiter as seen across the icy surface of its moon Europa.

Volcanic activity on Jupiter's moon Io, with the planet Jupiter visible on the horizon.

Artist's concept of a Mars-like moon in front of a gas giant.

The gas giant Jupiter seen above the surface of Jupiter's moon Europa.

Artist's concept of Saturn as seen from the surface of its moon Iapetus.

A crescent Jupiter and volcanic satellite, Io, hover over the horizon of the icy moon of Europa.

Gas giant orbiting Sirius star along with four moons.

Artist's concept of an Extrasolar Gas Giant with two of its' many moons.

Two artificial moons travelling around a gas giant devouring the natural moons.

Artist's depiction of a ringed gas giant planet surrounded by it's moons.

Artwork of Jovian Moon Callisto