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Human understanding of the universe has evolved through a series of revolutionary observations that challenged prevailing notions of the cosmos. One of the earliest and most influential shifts came from the work of Nicolaus Copernicus in the 16th century. Prior to Copernicus, the geocentric model proposed by Ptolemy dominated, which placed Earth at the center of the universe. Copernicus proposed a heliocentric model, positioning the Sun at the center and asserting that the Earth rotates on its axis and revolves around the Sun. This observation fundamentally altered human perception by suggesting that Earth _______ __________ __________ __________ ______ ____ ______ _________ ___ ____ _______.
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