| 41. | These galaxies are not visible with optical telescopes and yet ( March 2009 ) undiscovered.
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| 42. | :Are you limiting your question to optical telescopes?
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| 43. | "Before Reber, there was no radio astronomy _ just ` astronomy'because people only used optical telescopes ."
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| 44. | New optical telescopes also make use of interferometry improving resolution by combining images from separate telescopes.
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| 45. | The invention of the optical telescope brought about the first leap in the quality of lunar observations.
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| 46. | For other large telescopes of the period see List of largest optical telescopes in the 20th century.
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| 47. | When fully operational in 2005, the Large Binocular Telescope will be the world's most advanced optical telescope.
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| 48. | The seven optical telescopes at Bayfordbury campus allow students to observe detailed images of objects in space.
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| 49. | The AXAF mirrors are radically different from the flat, round ones on the Hubble and other optical telescopes.
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| 50. | The radiotelescopes were able to focus on details 1, 000 times fainter than anything seen by optical telescopes.
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