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

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

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

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

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

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.

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

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.

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

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

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

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

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

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

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

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

Umbriel orbits Uranus. It is the darkest of Uranus's large moons and has an old, heavily cratered surface.