The Moon's orbit around Earth has a sidereal period of 27.3 days. Its gravitational influence is the main driver of Earth's tides and very slowly lengthens Earth's day. The Moon orbits Earth at an average distance of 384,400 km (238,900 mi), or about 30 times Earth's diameter. Its surface gravity is about one-sixth of Earth's at 0.1654 g- Jupiter's moon Io is the only satellite in the Solar System known to have a higher surface gravity and density. It lacks any significant atmosphere, hydrosphere, or magnetic field. The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term. It is larger than all known dwarf planets in the Solar System.
Its diameter is about one-quarter of Earth's (comparable to the width of Australia), making it the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet. The Moon is Earth's only natural satellite.
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