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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 was not the unique center of the cosmos but just one of several planets orbiting a central star. Although initially controversial, this model set the stage for further observational astronomy. The invention of the telescope by Galileo Galilei in the early 17th century provided the empirical evidence ___ ___ _______ _______ ______ _________ _______.
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