uranus88Snificant Events. March 13, 1781: British astronomer William Herschel discovers Uranus – the first new planet discovered since ancient times – while searching for faint stars. 1787-1851: Four Uranian moons are discoveredA near-infrared image of the six largest moons and eht inner moons of Uranus as captured by the James Webb Space Telescope on 4 September 2025. Uranus, the seventh planet of