Who first published the heliocentric theory, proposing that the sun is at the center of the universe and the planets orbit the sun?

Who first published the heliocentric theory, proposing that the sun is at the center of the universe and the planets orbit the sun?

• A. Nicolaus Copernicus
• B. Galileo Galilei
• C. Johannes Kepler
• D. Ptolemy

Answer: (A)

Nicolaus Copernicus first published the heliocentric idea, proposing that the Sun sits near the center of the solar system and that the planets orbit it. He announced this in his work De revolutionibus orbium coelestium (1543), challenging the long-held geocentric view that placed Earth at the center. This publication kicked off the Copernican Revolution, reshaping how we understand the structure of the cosmos. Later scientists built on his idea with observational and mathematical refinements—Galileo provided telescopic evidence supporting heliocentrism, Kepler showed that orbits are elliptical, and Ptolemy represented the earlier, Earth-centered model with epicycles.

Nicolaus Copernicus first published the heliocentric idea, proposing that the Sun sits near the center of the solar system and that the planets orbit it. He announced this in his work De revolutionibus orbium coelestium (1543), challenging the long-held geocentric view that placed Earth at the center. This publication kicked off the Copernican Revolution, reshaping how we understand the structure of the cosmos. Later scientists built on his idea with observational and mathematical refinements—Galileo provided telescopic evidence supporting heliocentrism, Kepler showed that orbits are elliptical, and Ptolemy represented the earlier, Earth-centered model with epicycles.