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Galileo also made drawings of the moon, but his flash of genius was to turn his telescopes to the wanderers in the sky—the planets. He discovered Jupiter's four largest moons, and Saturn's rings. ... Yet, one problem remained for refractors. So far, lens makers could not make a useable objective larger than four inches.
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www.brighthub.com/science/space/articles/23171.aspx
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Refracting telescope - Wikipedia, the free encyclopedia
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A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was o...
en.wikipedia.org/wiki/Refracting_telescope
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In it, he discussed the two main advantages that a space-based observatory would have over ground-based telescopes: First, the angular resolution (smallest separation at which objects can be clearly distinguished) would be limited only by diffraction, rather than by the turbulence in the atmosphere which causes stars...
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my.opera.com/quizzer123/blog/show.dml/231274
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Large lenses deform under their own weight, but mirrors can be supported. Reflectors do not suffer from chromatic aberration like refractors do. Large mirrors need only one optical surface, achromats four surfaces to grind. Large, very clea...
http://wiki.answers.com/Q/Why_are_the_large_telescopes_...
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The World's Largest Optical Telescopes ... 4x1.8 Pan-STARRS Hawaii Four separate telescopes; optimized for surveys; cheaper than LSST; PS1 first light was Aug 2007 ... 1.86 Dominion Astrophysical Observatory Victoria, Canada was once (briefly) the largest telescope in the world...
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astro.nineplanets.org/bigeyes.html
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Notes:; Constantin Huygens was the brother of the more well-known Christian Huygens. James Short (1710-1768) was a skilled optician who made at least 1370 telescopes during his lifetime, most of them Gregorian reflectors and some of them the largest telescopes of his time.
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www.stjarnhimlen.se/bigtel/LargestTelescope.html
www.stjarnhimlen.se/bigtel/LargestTelescope.html
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Telescope: Telescopes.com is a premier online retailer of telescopes, telescope eyepieces and telescope accessories. We offer a comprehensive selection of telescopes and telescope eyepieces which you can browse 24/7. ... With user-friendly GoToNova technology, intuitive handsets, and the largest LCD screens on the market,
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www.telescopes.com/
www.telescopes.com/
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The World's Largest Optical Telescopes ... UBC LMT Malcolm Knapp Research Forest, British Columbia 49 17N; 123 34 W; 400 m mercury mirror; not steerable...
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astroa.physics.metu.edu.tr/bigeyes.html
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