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Uranus’s Moon Stephano Has a Strange Orbit.

With a diameter of just about 20 miles, Stephano is one of Uranus’s smaller moons. Notably, it follows a retrograde orbit, meaning it circles Uranus in the opposite direction from the planet’s regular satellites as well as the planet's rotation. Its orbital characteristics are similar to those of another moon, Caliban, so scientists believe the two moons likely have a common origin.

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