The Moon is locked with the Earth, which means that we always see the same side of the Moon. You would think that this meant that we could only see 50% of the Moon's surface, but we can see slightly more from Earth.

Occupation: Astronomer, Mathematician, Engineer

Year born: 1564

Research Areas: speed, velocity, motion, astronomy, tides

We know that Neptune has at least 14 moons. They are all named after water gods or creatures in Greek and Roman mythology.

Uranus has 27 moons. They are all named after characters from William Shakespeare or Alexander Pope's works. 

Mars has two moons called Phobos and Deimos. The planet Mars is named after the Roman god of war. As such the moons are called Phobos, which means 'fear' or 'panic', and Deimos, meaning 'terror' or 'dread'.

The gas giant planet, Jupiter has more than 90 moons. So far, fewer than 60 of the moons have been named, the rest are waiting for official names.

The Moon is the Earth's only natural satellite. We know it as 'the Moon' but scientists sometimes call it Luna. The word 'lunar' means 'relating to the Moon'.