Twin 6.5-meter (21.3-ft.) telescopes, jointly owned and operated by the
Carnegie Institution, the Massachusetts Institute of Technology, and the
Universities of Arizona, Harvard, and Michigan. They are located at the
Las Campanas Observatory in the Chilean
Andes. The first telescope, named after Walter Baade,
began scientific operation in February 2001. The second telescope, named
after Landon Clay, saw first light in September 2002.