Telescopes with just one or two

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{"fact":"In 1987, cats overtook dogs as the number one pet in America (about 50 million cats resided in 24 million homes in 1986). About 37% of American homes today have at least one cat.","length":178}

{"type":"standard","title":"Three-mirror anastigmat","displaytitle":"Three-mirror anastigmat","namespace":{"id":0,"text":""},"wikibase_item":"Q7797269","titles":{"canonical":"Three-mirror_anastigmat","normalized":"Three-mirror anastigmat","display":"Three-mirror anastigmat"},"pageid":36123634,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/PaulBakerTelescope.png/330px-PaulBakerTelescope.png","width":320,"height":247},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/7/74/PaulBakerTelescope.png","width":720,"height":556},"lang":"en","dir":"ltr","revision":"1281271788","tid":"cdf93c19-04ad-11f0-8795-ea3664138bfb","timestamp":"2025-03-19T10:34:58Z","description":"Reflecting telescope design","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Three-mirror_anastigmat","revisions":"https://en.wikipedia.org/wiki/Three-mirror_anastigmat?action=history","edit":"https://en.wikipedia.org/wiki/Three-mirror_anastigmat?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Three-mirror_anastigmat"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Three-mirror_anastigmat","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Three-mirror_anastigmat","edit":"https://en.m.wikipedia.org/wiki/Three-mirror_anastigmat?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Three-mirror_anastigmat"}},"extract":"A three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations – spherical aberration, coma, and astigmatism. This is primarily used to enable wide fields of view, much larger than possible with telescopes with just one or two curved surfaces.","extract_html":"

A three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations – spherical aberration, coma, and astigmatism. This is primarily used to enable wide fields of view, much larger than possible with telescopes with just one or two curved surfaces.

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{"fact":"Purring does not always indicate that a cat is happy and healthy - some cats will purr loudly when they are terrified or in pain.","length":129}