The universe holds 172 moons in this complete collection, spanning every corner of the solar system. The selection includes natural satellites orbiting planets, dwarf planets, and a range of smaller bodies.

Moons are natural satellites that orbit planets and other bodies in the solar system. They range from tiny, irregular rocks just a few kilometers wide to massive worlds larger than the planet Mercury. Each moon has its own geology, composition, and history, shaped by its host planet and its own internal forces. Scientists study moons to understand planetary formation, potential habitability, and the broader dynamics of the solar system.

Interesting and little-known facts about Moons: – Jupiter holds the record for the most moons of any planet, with over 90 confirmed natural satellites. – Ganymede, a moon of Jupiter, is the largest moon in the solar system, with a diameter of 5,268 km — bigger than the planet Mercury. – Saturn’s moon Titan is the only moon known to have a dense atmosphere and stable liquid lakes on its surface. – Europa and Enceladus may harbor liquid water oceans beneath their icy crusts, making them prime candidates in the search for extraterrestrial life. – The Earth’s Moon is the fifth largest natural satellite in the solar system, with a diameter of 3,474 km. – Mars has two very small moons, Phobos and Deimos, which are thought to be captured asteroids rather than formed alongside the planet.

The alphabetical index below organizes all 172 moons by name, with each page listing the parent planet, diameter (km), discovery year, and a brief description for every entry.