Deep Sky
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History of the Discovery of the Deep Sky Objects.
Since the earliest times, humans could view stars at night whenever it happened not to be cloudy. As in prehistoric times, there was barely no light polution in ost regions of Earth, our ancestors could view stars of very faint light, and thus some of those objects we now summarize as Deep Sky Objects. This way, ome of these objects are known as long as anything is known.
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Pleiades (Seven Sisters)