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.

NASA scientists at the Southwest Research Institute discovered a 29th moon orbiting Uranus while using infrared detection through the Webb Space Telescope.

NASA said a tiny moon has been found by the Webb Space Telescope orbiting the planet Uranus. The moon is only six miles wide and was found by Webb’s near-infrared camera, The Associated Press reported. That’s about the length of a 10K. Scientists believe that it was missed for so long because it is tiny and is faint, the AP reported.