NASA has confirmed that the James Webb Space Telescope has discovered a previously unknown satellite orbiting Uranus, raising the ice giant’s moon tally to 29. The body, provisionally labelled S/2025 U1, was detected in a series of long-exposure images captured on 2 February 2025 by Webb’s Near-Infrared Camera. Analysis led by Dr. Maryame El Moutamid of the Southwest Research Institute indicates the moon is only about 10 kilometres across—smaller than many terrestrial suburbs—and orbits roughly 56,000 kilometres from Uranus’ centre, just beyond the planet’s narrow inner rings and between the paths of the moons Ophelia and Bianca. The object’s size put it below the detection limits of both Voyager 2 and the Hubble Space Telescope. Researchers say the find demonstrates Webb’s ability to spot faint, fast-moving targets in the outer Solar System and offers a fresh opportunity to study how Uranus’ rings and small moons interact. The International Astronomical Union will assign a formal name in keeping with the Shakespeare-and Pope-inspired convention for Uranian satellites once follow-up observations confirm the orbit.