he discovered that the earth revolved around the sun (heliocentricity) and at that time everyone believed that the sun/planets revolved around the earth (geocentricity)
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Sorry bud, try this. http://en.wikipedia.org/wiki/Nicolaus_Copernicus
Galileo used more advanced technology to find stronger observational evidence than Copernicus was ever able to provide.
he proved that the sun is the center of the earth and that it was Gods interest in doing so.
Nicolas Copernicus (1473-1543) is said to be the founder of modern astronomy He is famous for his theory which asserted that the earth rotated on its axis once daily and traveled around the sun once yearly:
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