Notable moons of the solar system's planets and their distinguishing features.
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- Which moon is the largest in the entire solar system?
- Ganymede, a moon of Jupiter
- What is the most distinctive feature of Io, Jupiter's moon?
- Active volcanism; it is the most volcanically active body in the solar system
- Which moon of Jupiter has a subsurface ocean beneath its ice crust?
- Europa
- What does Europa's surface look like?
- Smooth ice with linear cracks from tidal stress, very few impact craters
- What is most remarkable about Titan, Saturn's moon?
- It has a thick nitrogen atmosphere and liquid methane lakes on the surface
- What distinguishes Enceladus among Saturn's moons?
- Water geysers erupt from its south polar region
- What is the defining feature of Saturn's moon Mimas?
- A large impact crater called Herschel that resembles the Death Star
- What is distinctive about Saturn's moon Iapetus?
- It has a prominent equatorial ridge running around much of its circumference
- Which is the second-largest moon of Saturn?
- Rhea
- Which moon of Mars orbits so close it will eventually crash into the planet?
- Phobos
- What is unusual about Phobos' orbit around Mars?
- It orbits faster than Mars rotates, so it rises in the west and sets in the east
- When will Phobos crash into Mars?
- In approximately 30 to 50 million years
- What is Mars' outer and smaller moon called?
- Deimos
- Which is the largest moon of Uranus?
- Titania
- What is the second-largest moon of Uranus?
- Oberon