Lunar Libration

A video of lunar libration made by taking photos night after night for a month, showing a wobbleThe 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.

Earth's Moon

The Moon at Last Quarter Phase
Credit: NSO

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'.