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Whirlpool Galaxy (NGC 5194 or M51a) is the first classified spiral galaxy. It was discovered by Charles Messier in 1773 and was designated as M51. But, it was first recognized as a Spiral galaxy by Lord Rosse (William Parsons) in 1845 and thus becoming the first classified spiral galaxy. It is estimated to be around 23 million light years away in the constellation of Canes Venatici. It is one of the most popular galaxies in the sky. Found at http://buff.ly/18Tbzif

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