NASA’s James Webb Space Telescope has found a previously unknown moon orbiting Uranus. NASA announced the discovery on Tuesday, adding that the moon was first spotted on Feb. 2. Scientists estimate that the newly discovered moon is about six miles in diameter.

Roll out the cosmic welcome mat for our solar system’s newest resident: a never-before-seen moon orbiting Uranus. The Webb telescope’s observations of Uranus are giving scientists better insight into one of the more mysterious planets in our solar system.

In the space close to the icy planet, outside its ephemeral rings, JWST snapped a tiny object that no one had ever seen before, not even in data from the Voyager 2 probe that flew past Uranus at a close distance in 1986.