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Io orbits Jupiter. It is the most geologically active body in the Solar System due to tidal heating.

Europa orbits Jupiter. It has a subsurface ocean that may harbor extraterrestrial life.

Ganymede orbits Jupiter and is the largest moon in the Solar System.

Callisto orbits Jupiter. It is heavily cratered and is the most distant of the four Galilean moons.

Titan orbits Saturn. It has a thick atmosphere and lakes of hydrocarbons like methane and ethane.

Enceladus orbits Saturn. It has geysers that eject water into space, indicating a subsurface ocean.

Mimas orbits Saturn. It has a large crater named Herschel that makes it resemble the Death Star from 'Star Wars'.

Triton orbits Neptune. It is the only large moon in the Solar System with a retrograde orbit.

Charon orbits Pluto. It is the largest moon relative to its parent body in the Solar System.

Phobos orbits Mars. It is slowly spiraling inward and may crash into Mars or form a ring around the planet in the distant future.

Deimos orbits Mars. It is the smaller and outer of Mars's two moons and has a smoother surface than Phobos.

Oberon orbits Uranus. It is the second-largest of Uranus's moons and is heavily cratered.

Titania orbits Uranus. It is the largest of Uranus's moons and has a system of canyons and scarps.

Rhea orbits Saturn. It is the second-largest moon of Saturn and could have a thin ring system of its own.

Tethys orbits Saturn. It is largely ice with a density just slightly higher than water's.

Dione orbits Saturn. It has bright, wispy terrain where ice cliffs are exposed.

Iapetus orbits Saturn. It has a unique color dichotomy with one hemisphere much darker than the other.

Miranda orbits Uranus. It has one of the most extreme and varied topographies with features like the Verona Rupes, the tallest known cliff in the Solar System.

Ariel orbits Uranus. It has the youngest and brightest surface of Uranus's moons, which may indicate recent geological activity.