Copernicus put forward the idea that the Sun, rather than the Earth, was at the center of the universe.
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Copernicus proposed that the Sun was the center of the universe.
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
Nicolas Copernicus
the sun
Copernicus suggested a heliocentric model of the universe. Meaning, the earth was the centre of the universe and other planets had to orbit around the earth. This model of the universe was against Ptolemy's model of a geocentric model; a stationary Earth at the centre of the universe.