Since the Voyager 1 and 2 probes began returning images of Saturn and Jupiter's moons in the late 1970s and early 1980s, scientists have become more interested in planetary satellites. Europa and Titan are considered to be potential locations where life could exist and have recently been studied with unmanned probes.
Photo: Image of Io created from data gathered by the Galileo probe (NASA/JPL)
Jupiter's moon is the reddest object in the Solar System.
This heavily fractured moon was visited by Voyager 2.
Jupiter's second largest moon has an ancient surface.
One of Mars' tiny moons, Deimos was discovered in 1877.
Saturn's bright moon is home to ice fountains.
Jupiter's smooth moon may have subsurface oceans.
The Solar System's largest moon orbits Jupiter.
This moon of Saturn has a dark side.
Jupiter's moon is the Solar System's most volcanically active body.
Saturn's small moon is home to a very large crater.
Uranus's moon has a patchy face.
Earth's satellite had a turbulent birth.
Are Mars's moons really captured asteroids?
An oddball moon orbits Saturn.
Saturn's most heavily cratered moon was discovered in 1672.
Saturn's moon has a huge canyon.
Titan is the only moon with a dense atmosphere.
Voyager 2 showed astronomers close-up views of Titania.
Triton's unusual orbit is an important clue about its past.