Category
page 1Planetary satellite systems

Moon
The Moon is the only natural satellite of Earth. It orbits around Earth at an average distance of , a distance roughly 30 times the width of Earth. It completes an orbit (lunar month) in relation to Earth and the Sun (synodically) every 29.5 days. The Moon and Earth are bound by gravitational attraction, which is stronger on the sides facing each other. The resulting tidal forces are the main driver of Earth's tides, and have pulled the Moon to always face Earth with the same near side. This tidal locking effectively synchronizes the Moon's rotation period (lunar day) to its orbital period (lu
extrasolar moon
thumb|right|Artist's impression of candidate exomoon Kepler-1625b I orbiting its planet.
Neith
hypothetical natural satellite of Venus
provisional designation in astronomy
designation of an astronomical body after its discovery and before its official name
claimed moons of Earth
claims that Earth may have other natural satellites
Mercury's moon
supposed natural satellite orbiting Mercury
Commensurability (astronomy)
proportionality of orbital periods for two celestial bodies