These newly discovered moons are thought to be odd-shaped and about 100 km across. They are considered irregular, though, because they orbit in odd directions and far from Uranus . If Uranus' irregular moons have the same origin as those orbiting Jupiter , Saturn , and Neptune , then they were probably caught from orbits around the Sun . Moons like this are discovered by their motion. One of these moons is shown above as the circled point of light moving from left to right.
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