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{{Other uses|Telescope (disambiguation)}}
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A '''telescope''' is an [[optical instrument]] using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation.<ref>{{cite web|url=https://www.ahdictionary.com/word/search.html?q=TELESCOPE|title=The American Heritage Dictionary entry: TELESCOPE|first=Houghton Mifflin Harcourt Publishing|last=Company|website=www.ahdictionary.com}}</ref> The first known practical telescopes were [[refracting telescope]]s invented in the [[Netherlands]] at the beginning of the 17th century, by using glass [[lens (optics)|lenses]]. They were used for both terrestrial applications and [[astronomy]].
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