These are the faintest and smallest observed so far on any planet in the solar system, but astronomers believe there could be many more.

The yellow arrow points directly to the tiny bright spot that reveals the presence of S/2023 U1, the new moon of Uranus, just 8 km in diameter. The planet is just outside the field of view in the upper left, as revealed by the increasing light. Scott Sheppard


Updated at 00:00.

A team of astronomers from the Carnegie Institution for Science, based in Washington, has succeeded in adding three new moons to those already known in the solar system. One of them around Uranus, which thus raises its count to…

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