The Lyndon B. Johnson Space Center (JSC) is the National Aeronautics and Space Administration's center for human spaceflight activities. The center consists of a complex of 100 buildings constructed on 1,620 acres (656 ha) located in the Bay Area of southeast Houston, Texas. Johnson Space Center is home to the United States astronaut corps and is responsible for training astronauts from both the U.S. and its international partners. The center, originally known as the Manned Spacecraft Center, was constructed on land donated by Rice University and opened in 1963. On February 19, 1973, the center was renamed in honor of the late U.S. president and Texas native, Lyndon B. Johnson. JSC is one of ten major NASA field centers.