Arizona Stadium is a college football stadium in Tucson, Arizona, United States. It is the home field of the University of Arizona Wildcats football team, which plays in Pacific-12 Conference. Originally constructed in 1928 to hold 7,000 spectators, the stadium's seating capacity has been expanded numerous times since. In 2009, the university announced major expansion plans for the facility, and as of 2012, the stadium had a total capacity of 51,811. The facility also includes various academic offices, including the Steward Observatory Mirror Lab.