Osservare il cielo/Osservare al telescopio - Wikibooks, manuali e libri di testo liberi
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6. Optics and Telescopes Refractingtelescopes Reflectingtelescopes Image degradation Imaging systems Spectrographs Non-opticaltelescopes Orbitingtelescopes. - ppt download
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Newtonian telescope - Wikipedia
File:Newtonian telescope.svg - Wikimedia Commons
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