Which is true about the astronomers Ptolemy and Nicolaus Copernicus?
A. Both astronomers believed the earth was the center of the universe.
B. Both astronomers arrived at incorrect models of the universe.
C. Copernicus disputed Ptolemy's geocentric theory and proved his own heliocentric theory, which stated
that the sun was the center of the universe.
OD. Ptolemy disputed Copernicus' geocentric theory and proved his own heliocentric theory, which stated
that the sun was the center of the universe.

Nicolaus Copernicus and Ptolemy were two influential astronomers with differing theories about the structure of the universe. While Ptolemy proposed a geocentric model, with Earth at the center, Copernicus developed a heliocentric model where the Sun lay at the center, displacing Earth.

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