The University of California, Santa Barbara is a public research university and one of the 10 campuses of the University of California system. The main campus is located on a 1,022-acre (414 ha) site near Goleta, California, United States, 8 miles (13 km) from Santa Barbara and 100 miles (160 km) northwest of Los Angeles. Tracing its roots back to 1891 as an independent teachers' college, UCSB joined the University of California system in 1944 and is the third-oldest general-education campus in the system. UCSB is one of America's Public Ivy universities, which recognizes top public research universities in the United States. The university is a comprehensive doctoral university and is organized into five colleges and schools offering 87 undergraduate degrees and 55 graduate degrees. UC Santa Barbara is a "very high activity" research university with twelve national research centers, including the renowned Kavli Institute for Theoretical Physics. Current UCSB faculty includes six Nobel Prize laureates, one Fields Medalist, 29 members of the National Academy of Sciences, 27 members of the National Academy of Engineering, and 31 members of the American Academy of Arts and Sciences. UCSB was the No. 3 host on the ARPAnet and was elected to the Association of American Universities in 1995.