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