Moons: Facts

Introduction

Moons – also called natural satellites – come in many shapes, sizes and types. They are generally solid bodies, and few have atmospheres. Most planetary moons probably formed out the discs of gas and dust circulating around the planets in the early solar system.

There are more than 470 known moons in our solar system. Most moons orbit planets. As of March 2025, there were 421 officially recognized moons orbiting planets, including dwarf planet Pluto. The remaining moons are orbiting small bodies including other dwarf planets, asteroids, and trans-Neptunian objects (TNOs). TNOs are objects in the solar system that have an orbit beyond Neptune.

How Moons Get Their Names

Every moon discovered in the modern era gets a number first. For example, S/2009 S1 was the first satellite discovered at Saturn in 2009. The most significant moons get an official name. Most moons in our solar system are named for mythological characters from a wide variety of cultures. Newer moons discovered at Saturn, for example, are named for Norse mythology such as Bergelmir, a giant. Uranus is the exception. Uranus' moons are named for characters in William Shakespeare's plays with destinations such as Ophelia and Puck in orbit. Other Uranian moon names were chosen from Alexander Pope's poetry (Belinda and Ariel).

Moons of the Inner Solar System

Earth's Moon probably formed when a large body about the size of Mars collided with Earth, tossing a lot of material from our planet into orbit. Debris from early Earth and the impacting body accumulated to form the Moon approximately 4.5 billion years ago (the age of the oldest collected lunar rocks). Twelve American astronauts landed on the Moon during NASA's Apollo program from 1969 to 1972, studying the Moon and bringing back rock samples.

Usually the term moon brings to mind a spherical object, like Earth's Moon. The two moons of Mars — Phobos and Deimos —are different. While both have nearly circular orbits and travel close to the plane of the planet's equator, they are lumpy and dark. Phobos is slowly drawing closer to Mars and could crash into the planet in 40 or 50 million years. Or the planet's gravity might break Phobos apart, creating a thin ring around Mars.

• Earth's Moon
• Martian Moons Phobos and Deimos

Moons of the Giant Planets

Jupiter's four largest moons were the first moons discovered beyond Earth. Jupiter's menagerie of moons includes the largest moon in the solar system — Ganymede. Jupiter also has an ocean moon —Europa, which will be explored by NASA's Europa Clipper spacecraft. Jupiter's other two large moons are Io, a volcanic moon, and Callisto. Many of Jupiter's outer moons have highly elliptical orbits and orbit backwards (opposite to the spin of the planet). Saturn, Uranus and Neptune also have some irregular moons, which orbit far from their respective planets.

Saturn has two ocean moons – Enceladus and Titan. Both have subsurface oceans and Titan also has surface seas of lakes of ethane and methane. The chunks of ice and rock in Saturn's rings (and the particles in the rings of the other outer planets) are not considered moons, yet embedded in Saturn's rings are distinct moons or moonlets. These shepherd moons help keep the rings in line. Titan, the second largest in the solar system, is the only moon with a thick atmosphere.

In the realm of the ice giants, Uranus's inner moons appear to be about half water ice and half rock. Miranda is the most unusual; its chopped-up appearance shows the scars of impacts of large rocky bodies.

Neptune's moon Triton is as big as Pluto and orbits backwards compared with Neptune's direction of rotation.

• Jupiter's Moons
• Saturn's Moons
• Uranus's Moons
• Neptune's Moons

Moons of Dwarf Planets

Pluto's large moon Charon is about half the size of Pluto. Like Earth's Moon, Charon may have formed from debris resulting from an early collision of an impactor with Pluto. Scientists using the Hubble Space Telescope to study Pluto found four more small moons.

Eris, another dwarf planet even more distant than Pluto, has a small moon of its own, named Dysnomia. Dwarf planet Haumea has two satellites, Hi'iaka and Namaka. Ceres, the closest dwarf planet to the Sun, has no moons.

• Pluto's Moons
• Eris's Moon
• Haumea's Moon

More Moons

Scientists weren't sure if asteroids could hold moons in their orbits until the Galileo spacecraft flew past asteroid Ida in 1993. Images revealed a tiny moon, later named Dactyl. Astronomers have since confirmed more than 470 moons orbiting asteroids and trans-Neptunian objects.

Full List: Moons Orbiting Planets and Dwarf Planets in Our Solar System