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UNIVERSE. MOONS.

 

A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planetor minor planet (or sometimes another small Solar System body).

In the Solar System there are six planetary satellite systems containing 175 known natural satellites. Four IAU-listed dwarf planets are also known to have natural satellites: Pluto, Haumea, Makemake, and Eris. As of October 2016, there are over 300 minor planets known to have moons.

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