The Moon is the only natural satellite of the Earth and the fifth largest satellite in the Solar System. he Moon is in synchronous rotation with Earth.
The Moon is thought to have formed nearly 4.5 billion years ago. The Moon makes a complete orbit around the Earth with respect to the fixed stars about once every 27.3 days.
The Moon is the second densest satellite after Io, a satellite of Jupiter.
It is the largest natural satellite of a planet in the Solar System relative to the size of its primary having 27% the diameter and 60% the density of Earth, resulting in 1⁄81 its mass.
Earlier in Earth's history, the Moon was closer to Earth, and had an apparent visual size greater than that of the Sun.
The Moon's current orbital distance is about thirty times the diameter of the Earth