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