Lowell Observatory Lowell Observatory Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States. Lowell Observatory was established in 1894, placing it among the oldest observatories in the United States, and was designated a National Historic Landmark in 1965. In 2011, the Observatory was named one of "The World's 100 Most Important Places" by TIME. It was at the Lowell Observatory that the dwarf planet Pluto was discovered in 1930 by Clyde Tombaugh. The observatory was founded by astronomer Percival Lowell of Boston's Lowell family and is overseen by a sole trustee, a position historically handed down through the family. The
Lowell Connector (now FHWA) or the American Association of State Highway Officials (now AASHTO). Further, the "Business I-495" designation was never posted on any signs for the Lowell Connector exit on I-495, US 3, or on any signs on the Connector mainline itself (verified by a comprehensive review of MassDPW signing plans for I-495, US 3, and the Lowell Connector from the late 1950s to the present), although such signs were posted at one time on local streets intersecting the Connector. The signs on Plain Street (Exit 4) lasted into the 2000s, but have since been removed. The Lowell Connector was recently