Multi-mirror telescope
Mirror Telescope (MMT) is a 6.5-meter optical telescope built by the Smithsonian Institute and the University of Arizona and is located 60 kilometers south of Tucson, Arizona, USA. The top of the mountain is the seat of the Fred Lawrence Whipple Observatory under the Smithsonian Institute. The multi-mirror telescope was originally a telescope consisting of six hexagonal mirrors with a diameter of 1.8 m, equivalent to 4.5 meters in diameter, built in 1974, at the time the world's third largest optical telescope. In 1985, the researchers decided to turn it into a 6.5-meter single-mirror telescope to get a bigger spotlight and field of view. March 2, 1998, the original multi-mirror telescope began to dismantle, March 25, 1999 by the University of Arizona Stewart Observatory mirror laboratory casting 6.5 meters diameter borosilicate glass primary mirror arrived at the scene in May the same year 17 days for the first observation, and in May 20, 2000 officially put into use. ...