DULUTH — Did you receive a telescope as a holiday gift? Even if it was years ago and that instrument is now hidden away in an attic, consider taking it out again. There are all sorts of wonderful ...

Optical telescopes utilize refraction and reflection to focus light, enabling detailed astronomical observations and ...

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For thousands of years, humans observed the stars with nothing but our own eyes. But eyes can only get us so far, and to see all the way to the ends of the universe we needed to invent some tools. The ...

II. THE simplest form of the reflecting telescope is that in which only one reflecting surface is used, known as the Herschelian, or, as Sir John Herschel, in his work, “The Telescope,” calls it, “the ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Reflecting telescope made in the ...