Uranus has a new moon

Astronomers have used the power of NASA's James Webb Space Telescope to discover a tiny new moon orbiting Uranus. S/2025 U1 is just 10 kilometres or so across. The distant ice giant now has 29 known moons. “No other planet has as many small inner moons as Uranus,” says astronomer Matthew Tiscareno, who co-discovered the new body. “Their complex inter-relationships with the rings hint at a chaotic history that blurs the boundary between a ring system and a system of moons.”