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...

They are respectively the fourth-, sixth-, first-, and third-largest natural satellites in the Solar System, containing approximately 99.997% of the total...

planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally...

itself. Over a century passed before the discovery of the second natural satellite, Nereid, in 1949, and another 40 years passed before Proteus, Neptune's...

The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces...

albedos. Absolute magnitudes of irregular satellites were taken from the Minor Planet Center's Natural Satellites Ephemeris Service. Calculations were made...

of natural satellites is the potential of moons to provide habitats for life, though it is not an indicator that they harbor it. Natural satellites are...

while orbital elements of irregular satellites are based on the epoch of 1 January 2020. List of natural satellites The mass of Triton is about 2.14 × 1022 kg...

and if a satellite, was near one of its elongations. Until this time I had said nothing to anyone at the Observatory of my search for a satellite of Mars...

The dwarf planet Pluto has five natural satellites. In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. Charon, the largest...