3 Planetariums to Explore in Arizona

This is the largest satellite facility of the Smithsonian Astrophysical Observatory (SAO), part of the Center for Astrophysics. It is their largest field installation outside of their main site in Cambridge, Massachusetts. It is located near Amado, Arizona on the summit, a ridge and at the foot of Mount Hopkins.

This is the research arm for the Department of Astronomy at The University of Arizona. MGIO consists of three telescopes: the Vatican Advanced Technology Telescope, the Heinrich Hertz Submillimeter (Radio) Telescope of the Arizona Radio Observatory, and the Large Binocular Telescope, the world's most powerful telescope. Public tours of the MGIO are conducted by the Eastern Arizona College's (EAC) Discovery Park Campus between mid-April and mid-October.

Also known as the Mount Lemmon Infrared Observatory, is an astronomical observatory located on Mount Lemmon in the Santa Catalina Mountains approximately 28 kilometers northeast of Tucson, Arizona . The site in the Coronado National Forest is used with special permission from the U.S. Forest Service by the University of Arizona's Steward Observatory, and contains a number of independently managed telescopes.