Satellites · Updated May 2026

Moons of the solar system.

The solar system has more than 290 confirmed moons. This page covers the named major moons — the ones with their own pages here. Pick a parent body to see its moons, or jump straight into the 3D viewer to watch them orbit in real time.

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Earth

• Moon The Moon is Earth's only natural satellite — the fifth-largest moon in the solar system and the largest relative to its parent planet.

Earth

• Moon The Moon is Earth's only natural satellite — the fifth-largest moon in the solar system and the largest relative to its parent planet.

Mars

• Phobos Phobos is the larger and inner of Mars's two moons.
• Deimos Deimos is the smaller and outer of Mars's two moons, just 12 km across at its longest dimension.

Jupiter

• Io Io is the innermost of Jupiter's four Galilean moons and the most volcanically active body in the solar system.
• Europa Europa is the smallest of Jupiter's four Galilean moons at 3,122 km diameter — just smaller than Earth's Moon.
• Ganymede Ganymede is the largest moon in the solar system, with a 5,268 km diameter — bigger than the planet Mercury, though only 45% as massive.
• Callisto Callisto is the outermost Galilean moon and the third-largest moon in the solar system at 4,821 km diameter.

Saturn

• Titan Titan is Saturn's largest moon and the second-largest moon in the solar system at 5,150 km diameter.
• Enceladus Enceladus is a small icy moon of Saturn — just 504 km across — that sprays plumes of water ice into space from giant fissures near its south pole.
• Rhea Rhea is Saturn's second-largest moon at 1,527 km diameter, an icy body with a heavily cratered surface and a thin oxygen-carbon-dioxide exosphere — the first detected around any moon of the outer solar system..
• Dione Dione is one of Saturn's mid-sized icy moons, 1,123 km across.

Uranus

• Miranda Miranda is the smallest of Uranus's five major moons at just 472 km across, but its surface has some of the most extreme terrain in the solar system: corrugated patterns, 20-km-tall cliffs at Verona Rupes (the tallest known cliff anywhere), and chaotic juxtapositions of old and young surface..
• Ariel Ariel is the brightest of Uranus's moons and one of the larger ones at 1,158 km diameter.
• Umbriel Umbriel is the darkest of Uranus's major moons, with the lowest reflectivity and the oldest, most heavily cratered surface among them.
• Titania Titania is the largest moon of Uranus at 1,578 km in diameter — about half the size of Earth's Moon.
• Oberon Oberon is the second-largest moon of Uranus at 1,523 km diameter and the outermost of its major moons.

Neptune

• Triton Triton is the largest moon of Neptune at 2,707 km diameter — and the only large moon in the solar system with a retrograde orbit (it goes the opposite way to its planet's rotation).
• Nereid Nereid is one of Neptune's outer moons, just 340 km across.

Pluto

• Charon Charon is the largest moon of Pluto at 1,212 km diameter — half the size of Pluto itself.