Explanation: Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson compact groups.
说明：加拿大天文学家Paul Hickson和他的同事通过巡天观测夜空中的星系后识别了大约100个紧密的星系群，这些星系群现在被恰当地称为希克森致密星系群。
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