what is moon?
It  is a gravity rounded astronomical body orbiting Earth and is the planet's only natural satellite.
Moon
 is a gravity rounded astronomical body orbiting Earth and is the planet's only natural satellite. 
where is the earth's moon located in the solar system UNANSWERABLE
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Moon [SEP] Introduction
The Moon is a gravity rounded astronomical body orbiting Earth and is the planet's only natural satellite. It is the fifth-largest satellite in the Solar System, and by far the largest among planetary satellites relative to the size of the planet that it orbits. The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known. The Moon is thought to have formed about 4.51 billion years ago, not long after Earth. The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a hypothetical Mars-sized body called Theia.