The Earth & Moon Summary
The Earth is our home planet.
The Earth has an atmosphere of nitrogen and oxygen and three-quarters of its surface is covered with water.
The Earth orbits the Sun at an average distance of one astronomical unit (1 AU).
The Earth's orbital period around the Sun is one year.
The Earth's rotational period is 24 hours.
The Moon is a satellite of the Earth.
The Moon is made of rock and it has no atmosphere.
The Moon is 81 times smaller than the Earth.
The Moon's rotational period around the Earth is approximately one month.