JWST has spotted the 29th moon of Uranus, finding an object that’s probably the size of a small city 2.7 billion kilometers away. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Within six years of discovering Uranus, William Herschel had found two moons. Although Herschel thought he had found four more, it took 64 years before the next two real discoveries. In the 135 further years before Voyager 2 visited the system, only one more moon was found, but in the last 40 years, the pace has picked up dramatically.

Voyager itself spotted 10 moons, bringing the total to 15. Far from being the end of things, however, these discoveries alerted astronomers to the likelihood that there were many more satellites in the system. These were either

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