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Planet it orbits: Uranus. Interesting facts: Ariel appears to have undergone substantial geologic activity in the past which has resulted in varied terrains.

Planet it orbits: Saturn. Interesting facts: Tethys has a large valley called Ithaca Chasma, which is 2,000 kilometers long.

Planet it orbits: Mars. Interesting facts: Phobos is getting closer to Mars and might eventually break apart or crash into the planet.

Planet it orbits: Uranus. Interesting facts: Miranda has one of the most extreme and varied topographies in the solar system, including a 20-kilometer-high cliff.

Planet it orbits: Jupiter. Interesting facts: Europa's icy surface may harbor an ocean of liquid water beneath.

Planet it orbits: Jupiter. Interesting facts: Callisto has the oldest and most heavily cratered surface in the solar system.

Planet it orbits: Neptune. Interesting facts: Triton is the only large moon in the solar system with a retrograde orbit, indicating it may have been captured from the Kuiper Belt.

Planet it orbits: Neptune. Interesting facts: Nereid has one of the most eccentric orbits of any moon in the solar system, suggesting it may have been captured.

Planet it orbits: Saturn. Interesting facts: Titan has a thick atmosphere and lakes of liquid methane.

Planet it orbits: Saturn. Interesting facts: Enceladus has geysers that spew water vapor and organic compounds into space.

Planet it orbits: Pluto. Interesting facts: Charon is so large compared to Pluto that they are often referred to as a double dwarf planet system.

Planet it orbits: Saturn. Interesting facts: Rhea may have a thin oxygen and carbon dioxide atmosphere and is heavily cratered.

Planet it orbits: Mars. Interesting facts: Deimos is the smaller of Mars' two moons and has a smoother, dust-covered surface.

Planet it orbits: Uranus. Interesting facts: Umbriel is the darkest of Uranus' major moons and has many impact craters.

Planet it orbits: Jupiter. Interesting facts: Io is the most volcanically active body in our solar system.

Planet it orbits: Jupiter. Interesting facts: Ganymede is the largest moon in the solar system, even bigger than the planet Mercury.

Planet it orbits: Saturn. Interesting facts: Mimas has a large crater named Herschel that makes it resemble the Death Star from Star Wars.

Planet it orbits: Saturn. Interesting facts: Dione has a wispy terrain caused by ice cliffs.

Planet it orbits: Uranus. Interesting facts: Titania is the largest of Uranus' moons, and features a large rift valley.