We’re not sitting on this one, Uranus has another Moon! Webb discovered an unknown moon orbiting the planet, expanding its known satellite family to 29. The newly discovered moon is estimated to be just six miles (10 km) in diameter, assuming it has a similar reflectivity (albedo) to Uranus’ other small satellites. We haven’t seen this moon before now, likely due to its small size rendering it invisible to earlier missions or telescopes. Of the planet's now 29 moons, this one is the 14th member