Moons of the Solar System

What this quiz asks

• Which moon of Jupiter is covered in hundreds of active volcanoes like this one?
• What is the surface of Jupiter's moon Europa made of, above all?
• Mars's two little moons, Phobos and Deimos, are named after what?
• A huge crater on Saturn's moon Mimas makes it look like which famous science-fiction creation?
• Neptune's largest moon, Triton, orbits in the opposite direction to the way Neptune spins.
• Which small moon of Saturn sprays jets of water vapour and ice grains from cracks near its south pole?
• Is Jupiter's moon Ganymede wider than the planet Mercury?
• Most of the moons of Uranus are named after characters created by which writer?
• Order Jupiter's four large moons from closest to the planet to farthest away.
• Jupiter's four large moons, Io, Europa, Ganymede and Callisto, are all named after what?
• Select ALL of these moons that scientists think hide an ocean of liquid water beneath their surface.
• Saturn's moon Titan has a thick atmosphere. Which gas makes up most of it?
• In what year did the European probe Huygens parachute down onto the surface of Titan?
• Pluto's moon Charon is about half Pluto's width. What unusual result does this have?
• Mars's moon Phobos is slowly spiralling closer to the planet.
• Saturn's moon Iapetus is famous for which strange feature?
• Select ALL of these that are moons of Neptune.
• What do astronomers call small moons whose gravity keeps a planet's ring narrow and neat?
• Which moon of Saturn tumbles chaotically as it orbits and looks like a giant sponge?
• Which two moons of Saturn share almost the same orbit and swap places about every four years?