A He suggested that planets have elliptical orbits.
B He proposed a Earth-centered model, or geocentric model, of the solar system.
C He introduced the idea that planets move in small circles called epicycles.
D He proposed a sun-centered model, or heliocentric model, of the solar system.
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D He proposed a sun-centered model, or heliocentric model, of the solar system.
In 1543, Nicolaus Copernicus published his work "De revolutionibus orbium coelestium," which presented the groundbreaking idea that the Sun, rather than the Earth, is at the center of the solar system, fundamentally changing our understanding of the cosmos.
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