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Parent Planet: Neptune; Key Features: Only large moon with a retrograde orbit, has geysers that spew nitrogen gas.

Parent Planet: Mars; Key Features: Larger of Mars' two moons, orbits close to Mars, expected to crash into Mars or break apart in 50 million years.

Parent Planet: Jupiter; Key Features: Largest moon in the Solar System, has its own magnetic field.

Parent Planet: Saturn; Key Features: Largest moon of Saturn, has a dense atmosphere and liquid hydrocarbon lakes on its surface.

Parent Planet: Mars; Key Features: Smaller of Mars' two moons, has a smoother appearance than its sibling due to accumulation of regolith.

Parent Planet: Jupiter; Key Features: Heavily cratered icy surface, contains a subsurface ocean, one of the oldest landscapes in the Solar System.

Parent Planet: Saturn; Key Features: Resembles the 'Death Star' from Star Wars due to its large crater, Herschel.

Parent Planet: Jupiter; Key Features: Most volcanically active body in the Solar System, has sulfuric lava flows.

Parent Planet: Saturn; Key Features: Known for cryovolcanoes that spew water ice and organic compounds, has a subsurface ocean.

Parent Planet: Jupiter; Key Features: Smooth icy surface, may harbor subsurface ocean, potential abode for extraterrestrial life.

Parent Planet: Uranus; Key Features: Second largest moon of Uranus, has a mix of craters, canyons, and steep scarps.

Parent Planet: Uranus; Key Features: Largest moon of Uranus, has an old, heavily cratered ice surface mixed with rock.

Parent Planet: Pluto; Key Features: The largest of Pluto's moons, might have a subsurface ocean, has a muted reddish pole called Mordor Macula.

Parent Planet: Saturn; Key Features: Third-largest moon of Saturn, has a wispy terrain caused by cryovolcanism.

Parent Planet: Uranus; Key Features: Known for its extreme geological activity with varied terrain, has the highest known cliff in the Solar System, Verona Rupes.

Parent Planet: Uranus; Key Features: Fourth-largest moon of Uranus, has valleys and ridges created by tectonic activity.

Parent Planet: Saturn; Key Features: Unique equatorial ridge, two-tone coloring divides the moon into dark and light hemispheres, slow rotation.

Parent Planet: Uranus; Key Features: Third-largest moon of Uranus, dark surface with the mysterious, bright feature Wunda crater.

Parent Planet: Saturn; Key Features: Second-largest moon of Saturn, has a thin oxygen and carbon dioxide atmosphere, possible ring system.