It must have cleared all other celestial bodies, except its own moons, from its orbit.

The dramatic Marley Foundation Astronomy Discover Center at Lowell Observatory in Flagstaff has a rooftop viewing deck and ...

After over a decade of planning, Lowell Observatory’s new state-of-the-art discovery center is opening its doors this ...

Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff. (520) 401-7173. 10 a.m.-10 p.m., $35. The grand opening of the Marley ...

The Leonid meteor shower streaks across the night sky in November. Here's what to know, including when is the best time to ...

Since its founding in 1894, Lowell Observatory in Flagstaff has been a beacon of astronomical discovery, its scientists famously identifying Pluto and revealing the expanding universe. Now ...