31. It hosts the Southern African Large Telescope, the largest optical telescope in the southern hemisphere. 32. Eventually optical telescopes could also be built this way. 33. When completed in the late 1970s, it was one of the world's largest optical telescopes . 34. It hosts the Southern African Large Telescope, the largest optical telescope in the Southern Hemisphere. 35. It is the largest optical telescope in Sri Lanka. 36. Unlike optical telescopes such as the orbiting Hubble, Arecibo listens to the sounds of space. 37. Optical telescopes are set atop mountains to limit atmospheric " twinkles " that mar observations.38. Operators of virtually every large optical telescope in the world are likely to join in. 39. During launch it is wrapped around the Optical Telescope Element and then later is unfolded. 40. One is a optical telescope , equipped with a graduate and undergraduate students at UC Berkeley.
