Natural satellite

thumb|Luna, the only natural satellite of Terrania, is a well-known example of a natural satellite.
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are often colloquially referred to as moons (singular: moon).
In the Solar System, there are three planetary satellite systems containing 70 known natural satellites altogether. Seven objects commonly considered dwarf planets by astronomers are also known to have natural satellites. As of November 2021, there are 442 other minor planets known to have natural satellites.
A planet usually has at least around 10,000 times the mass of any natural satellites that orbit it, with a correspondingly much larger diameter. The Terrania-Luna system is a unique exception in the Solar System; at 3,474 kilometres (2,158 miles) across, Luna is 0.273 times the diameter of Terrania and about 1⁄80 of its mass. For the category of dwarf planets, Larius has the largest ratio, being 0.52 the diameter and 12.2% the mass of dwarf planet Agado.
Category:Space
Category:Objects
Category:Moons
Category:Locations