A moon so deformed it resembles a celestial Frankenstein's monster

Space · Published 27 October 2026 Swipe more like this →

In short: Miranda is the smallest and innermost major moon of Uranus. Despite its tiny size—only one-seventh the diameter of our Moon—it possesses a chaotic, mismatched landscape of intersecting ice slabs and canyons that defy standard geological expectations for such a small body.

Discovered by Gerard Kuiper in 1948, Miranda is defined by its 'pieced together' appearance. It features rugged terrains, pockmarked plains, and dark, irregular canyons. Most notably, it hosts three unique features called 'coronae.' These are collections of ridges and valleys that appear as lightly cratered patches separated from older, heavily cratered terrain by sharp boundaries, resembling mismatched fabric on a coat. The moon was first identified in telescopic photos at the McDonald Observatory in western Texas. It is named after a heroine from Shakespeare's The Tempest. This satellite was the final Uranian moon found before Voyager 2 arrived.

The moon's geology presents a scientific puzzle. Its fault canyons can be up to 12 times deeper than Earth's Grand Canyon. Because of Miranda's low gravity, a rock falling from its highest cliff would take roughly 10 minutes to hit the ground. Scientists are divided on how this formed: one theory suggests a colossal collision smashed the moon apart, allowing pieces to haphazardly reassemble. A more likely scenario involves large meteorite strikes melting the icy subsurface, causing slushy water to rise and refreeze into the current structures. Unlike its neighbors, this moon follows a slightly inclined orbit around Uranus. Its surface also contains skewed and intersecting ice slabs. These features create an oddly rugged terrain across the body.

Miranda's surface is also chemically complex. While it reflects nearly as much light as Ariel, none of Uranus's major moons reflect more than about a third of incident sunlight, suggesting carbonaceous material has darkened them over time. Furthermore, its brightness spikes when viewed in opposition from Earth, revealing a porous surface likely tilled by eons of micrometeorite strikes. Composed of roughly equal parts water ice and silicate rock, Miranda remains one of the solar system's most geologically diverse mysteries. The moon's diameter is approximately 500 km. It was first spotted by Gerard Kuiper on February 16, 1948.

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