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copernicus and the heliocentric model
nicolaus copernicus heliocentric model
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copernicus model geocentric or heliocentric
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did copernicus invent the heliocentric model
copernicus and the heliocentric model, nicolaus copernicus heliocentric model, heliocentric model copernicus, copernicus heliocentric model of the universe, copernicus model geocentric or heliocentric, copernicus galileo heliocentric model, did copernicus invent the heliocentric model
