தொலைநோக்கி: திருத்தங்களுக்கு இடையிலான வேறுபாடு

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* [http://galileo.rice.edu/sci/instruments/telescope.html ''The Galileo Project – The Telescope'' by Al Van Helden '']
* [http://www.aip.org/history/cosmology/tools/tools-first-telescopes.htm "The First Telescopes". Part of an exhibit from Cosmic Journey: A History of Scientific Cosmology] by the American Institute of Physics
* [http://www.timeline-help.com/telescope-timeline.html Timeline of telescopic technology] {{Webarchive|url=https://web.archive.org/web/20131002195158/http://www.timeline-help.com/telescope-timeline.html |date=2013-10-02 }}
* [http://spiff.rit.edu/classes/phys230/lectures/nonoptical/nonoptical.html Outside the Optical: Other Kinds of Telescopes]
* {{cite web|last=Gray|first=Meghan|title=Telescope Diameter|url=http://www.sixtysymbols.com/videos/telescope.htm|work=Sixty Symbols|publisher=[[Brady Haran]] for the [[University of Nottingham]]|coauthors=Merrifield, Michael|year=2009}}
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"https://ta.wikipedia.org/wiki/சிறப்பு:MobileDiff/3217594" இருந்து மீள்விக்கப்பட்டது