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San Francisco Mountains near Flagstaff, Arizona Humphrey's Peak, shown here in the San Francisco Mountains, rises to 12,633 ft. (3853 meters). These peaks remain snow covered for most of the year. Flagstaff located at 7,000+ ft. (2135 m) can experience severe winters.

Lowell Observatory in Flagstaff is where the planet Pluto was discovered. The observatory is also where the recent celestial phenomenon of the Schumacher-Levy comet that crashed into Jupiter was first discovered.