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 discoveredLast updated on February 2nd, 2025. Cold, windy Uranus looks like a planet on its side. But you can’t see Uranus. At least, it’s not visible to the naked eye even though it is the third-largest