The annual event celebrates the discovery of the little planet with a big heart and other scientific advances at Flagstaff, ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short ...

Whether Pluto is officially a planet is the least interesting thing about the runt of the solar system, astronomers will tell you 95 years after the discovery of the fascinating and sometimes ...

Pluto may not be a planet any more, but you still have a chance to see the distant dwarf planet at one of Michigan's ...

Cody Half-Moon is the Chief Marketing Officer at Lowell Observatory, where she combines ... making a meaningful impact in Flagstaff. A shining example of her leadership was the opening of Lowell ...

Arizona's dark skies are a haven for astronomers and photographers. Some communities are fighting to keep them that way.

A bill from freshman Tucson lawmaker Kevin Volk would add 'howdy' to the extensive list of items mentioned in state statute ...

On today’s date 95 years ago, everyone’s favorite not-quite-a-planet, Pluto, was discovered by astronomer Clyde W. Tombaugh while working at the Lowell Observatory in Flagstaff, Arizona. Pluto’s ...

Tombaugh sent some of his drawings of Mars and Jupiter to the Lowell Observatory in Flagstaff, Arizona. The observatory directors were so impressed by Tombaugh’s work that they offered him a job ...