Moons Of The Solar System (Natural Satellites) 🌙
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!
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!
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!