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}}A '''moon''' is a body which orbits a [[planet]]. The Earth's moon is a natural [[satellite]] orbiting at an average distance of about 238,000 miles (380,000 km).  

}}A '''moon''' is a body which orbits a [[planet]]. The Earth's Moon (sometimes known as "Luna") is a natural [[satellite]] orbiting Earth at an average distance of about 238,000 miles (380,000 km).  

The Moon is unique in the solar system in its large relative size compared with the [[Earth]].  The Moon appears from the Earth to be the same size as the [[sun]], in perfect artistic symmetry, unlike any known other planet-moon system.  Moreover, unlike most planets in the [[solar system]], [[Earth]] has only one moon. And the Moon has two more remarkable artistic attributes: (1) it rotates and revolves in a way such that only one side is ever visible to the Earth and (2) its side that faces the Earth is smooth, while the side that remains hidden is jagged.  To those on Earth the Moon appears as an artistic disc that goes through phases in which greater or lesser amounts of the side lit by the sun are visible from Earth.

The Moon is unique in the solar system in its large relative size compared with the [[Earth]].  The Moon appears from the Earth to be the same size as the [[sun]], in perfect artistic symmetry, unlike any known other planet-moon system.  Moreover, unlike most planets in the [[solar system]], [[Earth]] has only one moon. And the Moon has two more remarkable artistic attributes: (1) it rotates and revolves in a way such that only one side is ever visible to the Earth and (2) its side that faces the Earth is smooth, while the side that remains hidden is jagged.  To those on Earth the Moon appears as an artistic disc that goes through phases in which greater or lesser amounts of the side lit by the sun are visible from Earth.