Suddenly, in photos taken six days apart ... And so on May 1, Lowell Observatory announced that Planet X would be named Pluto. But with its peculiar, tilted orbit and confoundingly small size ...

In 1928, the amateur astronomer was offered a job at Lowell Observatory in Arizona, where he discovered Pluto. In 1934 ... remained unmoving in the images, but anything closer could be visually ...

Ever since NASA's New Horizons sent back the first-ever photos of Pluto ... from north to south. Pluto was discovered in 1930 by Clyde Tombaugh while he worked at Lowell Observatory in Flagship ...

At the Lowell Observatory, visitors can conjure their inner astronomer by peering through world-class telescopes and sitting in on lectures on topics like black holes and the history of Pluto.

He used a blink comparator, a device that quickly flipped between two images of the same ... an 11-year-old girl who wrote to the Lowell Observatory. For a time, Pluto sat on diagrams of the ...

In 1930, the Lowell Observatory announced the discovery of a ninth planet at the end of the solar system: Pluto. Start the day smarter. Get all the news you need in your inbox each morning.