A peek through the largest public viewing telescope in the Southwest is just part of a five-hour tour of the universe, from 5 to 10 p.m., nightly; $48 Monday through Thursday, $60 Friday through Sunday, $30 student. Reservations are required. Visit skycenter.arizona.edu for reservations. Search Facebook for "Mt. Lemmon SkyCenter" for daily photo updates about current events in the universe.