A 'Moon' is an object that naturally orbits another astronomical body, with most moons that orbit close to the planet being tidally locked (the same side always faces the planet). A total of  175 moons orbit around the 6 planetary systems; only the planets Mercury and Venus are not known to have any moons. At least 9 moons are known to orbit four dwarf planets. Also, astronomers discover additional moons orbiting minor planets, from time-to-time. Currently, there are over 300 moons known to orbit minor planets like asteroids (five even have two moons), Jupiter trojans, near-Earth objects (two with two satellites each) and trans-Neptunian objects! Check out this list of the 30 Largest Moons!

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Facts About The Earth's Moon

The Moon is Earth's only permanent natural celestial companion! It is the fifth-largest moon in the Solar System, produces the Earth's ocean tides, is believed to have formed shortly after Earth and is the only other astronomical body that humans have set foot on!

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Mars' Tiny Two Moons

Mars' has two small natural moons called Phobos and Deimos that were discovered in 1877 by Asphal Hall. Both moons orbit very close to Mars taking only about 8 and 30 hours respectively to complete their orbits and are believed to be captured asteroids.

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Jupiter's Jovian Moon System

Jupiter is known to have the most moons in the Solar System with 69; the most massive of which are the four Galilena moons (Io, Europa, Ganymede and Callisto) that were famously discovered in 1610 by Galileo Galilei. The remaining moons such as the inner moon Amalthea and 61 outer moons are relatively tiny!

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Saturn's Amazing Moons

Saturn is known to have at least 62 diverse moons from the largest known as Titan, the icy Enceladus, spongy-looking Hyperion, ridged and two-faced Iapetus, the Death Star moon Mimas to the strangely smooth egg-shaped Methone and many more!

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Uranus' Icy Moons

Planet Uranus is known to have at least 27 moons all named after Shakespeare (or Alexander Pope) characters. 5 are large enough to have formed into near perfect spheres, theses are known as  Ariel, Miranda, Oberon, Titania, Umbriel with a smaller inner moon called Puck!

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Neptune's Frozen Moons

There have been 14 moons discovered to orbit Neptune, from the largest called Triton (with a diameter of over 2,700km) to the second largest, the irregularly shaped Proteus (420km in diameter) right down to Neptune's smaller moons of less than 20km in size. It is likely when a Space Probe next visits Neptune it'll discover additional small moons!

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Even Dwarf Planets Have Moons!

Most dwarf planets that have been discovered have at least one moon, such as Pluto's Charon, Eris' Dysnomia, Haumea's Hiʻiaka and Makemake's moon S/2015 (136472) (which doesn't have a proper name yet).

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Lesser Known Moons of the Solar System

There are several other strange moons that orbit other small dwarf planets, Jupiter trojans, centaurs - there are even asteroids that have not one but several moons!

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