Nestled atop Mars Hill in Flagstaff, Lowell Observatory has been a cornerstone of astronomical discovery since 1894 — and it’s still inspiring curiosity today.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

A new study finds that galaxy clusters — cosmic cities packed with thousands of galaxies — trace invisible highways of dark ...

In Flagstaff, Lowell Observatory has proclaimed the “Year of Pluto” and planned a series of celebrations, beginning with a visit Feb. 21 from mission leader Stern, who said in Tucson recently ...

New images of Pluto are broadcast on a globe at Lowell Observatory in Flagstaff, Ariz., on Tuesday, July 14, 2015. American astronomer Clyde Tombaugh discovered Pluto at the observatory in 1930.

As climate change has led to more severe weather, wildfires, storms and more, many people are thinking about how to save what ...

The designation is already used in other parts of the world to raise awareness for space science and planetary defense.

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, ...

Flagstaff's historic downtown is filled with charming shops, cafes, and breweries, offering a taste of local culture. The ...

As Asteroid Day marks its 10th anniversary, U.S. Senators Kelly and Cornyn introduce a resolution to establish National Asteroid Day.

Highlights in Flagstaff include the Lowell Observatory – where you can learn why Flagstaff is an International Dark Sky City – and Historic Downtown Flagstaff.

Lowell Observatory in Flagstaff — the historic research center where Pluto was discovered — has made national headlines ...