In 1781, William Herschel discovers a faint uncatalogued point in his telescope. He first thinks he has discovered a comet, but the orbit of the new object seems more of a planetary nature. This will be confirmed by subsequent observations: the planet Uranus has been discovered! Many years later, in the early nineteenth century, questions remain: the calculated orbit of Uranus does not match the o ...[Read More]
From Neptune to Planet Nine: finding planets with pen and paper
