From shattered puzzles to backward orbits: the diversity of our moons

Space · Published 21 October 2026 Swipe more like this →

In short: Our solar system hosts hundreds of natural satellites, ranging from tiny lumpy rocks to massive worlds with thick atmospheres and subsurface oceans. While Earth has one loyal companion, other planets host complex families of moons that behave in ways that defy our terrestrial expectations.

Moons, or natural satellites, primarily formed from discs of gas and dust during the early solar system. However, their origins vary significantly. Earth's Moon is believed to have formed approximately 4.5 billion years ago when a Mars-sized body collided with our planet, ejecting debris into orbit. In contrast, the gas giants and ice giants likely grew large enough to capture smaller objects through their massive gravitational fields. The diversity of these satellites is staggering. Jupiter hosts 97 moons, including Ganymede, the largest moon in the solar system, and Io, which features over 400 active volcanoes. Saturn holds the record for the most moons, with 274, including the massive Titan—the only moon with a thick atmosphere—and Enceladus, which shoots water jets at 800 mph.

Even the smaller planets have unique satellites: Mars has two lumpy, dark moons, Phobos and Deimos, while Neptune has Triton, a moon as large as Pluto that orbits in the opposite direction of its planet's rotation. Geological variety is equally extreme. Uranus's moon Miranda looks like a shattered puzzle due to heavy impacts, and some moons like Europa and Enceladus harbor hidden subsurface oceans. Even the naming conventions reflect human culture: while most moons are named after mythological figures, Uranus's moons are uniquely named after characters from Shakespeare's plays and Alexander Pope's poetry. From Phobos spiraling toward a fiery end in 40 to 50 million years to the shepherd moons keeping Saturn's rings in line, these bodies are dynamic laboratories of celestial mechanics.

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