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

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 ...

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

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 ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Homolovi State Park was ranked among top road trip destinations in Arizona, and for good reason. Here's why you should make ...

Scientists across the world, including some in Arizona, are keeping an eye on an asteroid that has a very slim chance of ...

The "Star Trek" legend's only son will discuss his memoir at the annual space-themed event.

Here’s all you need to know to have a ‘stellar’ time in Flagstaff. In 2024, the Lowell Observatory opened the new Marley Foundation Astronomy Discovery Center, which features a rooftop ...

Data from NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA) was used to create a water distribution map of the area near the moon's south pole. Credit: NASA's Goddard Space Flight Center ...

Google Maps will display the name “Gulf of America” instead of the “Gulf of Mexico” for U.S. users once official government sources are updated to reflect the name change ordered by ...