3. Jupiter Jupiter has lots of moons. Most of them are very small, and were probably once asteroids that got too close to Jupiter, but four of them are very large. We call these moons the Galilean moons, because they discovered by Galileo in 1610. You can see the Galilean moons yourself through a pair of binoculars. Just look towards Jupiter. The four tiny dots of light close by are the moons Io, Europa, Ganymede, and Callisto.

4. Europa Europa has been intriguing scientists for many years. Its surface is covered with ice, but under the ice there is a water ocean heated by the moon’s hot core. Scientists think that it has twice as much water as the Earth! This makes Europa the most likely place for life to exist outside our planet.

5. Ganymede Ganymede is the largest moon in the solar system. It’s larger than the planet Mercury. It’s also the only moon known to have its own magnetic field. Scientists have recently discovered that Ganymede, like Europa, has a water ocean under its icy surface.

6. Io Io is very beautiful. Its surface is covered with red, yellow and orange sulfur. But a human would not live long enough to enjoy these bright colours because Io is full of active volcanoes which erupt all the time. It’s probably the most violent of all the moons in the solar system.

7. Uranus Uranus has many amazing worlds that orbit it. Five of these worlds are large, while the rest are much smaller. Most of the small moons are probably captured asteroids, or comets which got too close to Uranus. As Uranus is so far away it is almost impossible to see its smaller moons from the Earth. They could not be discovered until a satellite was sent to explore Uranus in 1986.

8. Titan Titan is the largest of the many moons orbiting Saturn, and the second largest moon in the Solar System. It has an atmosphere much thicker than even that of the Earth. Sadly, Scientists don’t know very much about this world, because they have not yet been able to penetrate its thick clouds to photograph its surface.

9. Triton Triton is the largest of Neptune’s moons. Scientists believe that Triton formed as a planet at first. Then it was shaken from its orbit and captured by Neptune. Triton is a very cold place, but there is a lot going on there. It has geysers that shoot ice 8 km high into Triton thin atmosphere! There may be water under the ice at Triton. It is even possible that there might be life in that water.

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