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Q. Who among the following is the first to propose Helio-Centric theory in the western world?
Answer: Nicolaus Copernicus
Notes: In "On the revolution of heavenly spheres" published in 16th century, Nicolaus Copernicus stated that all the heavenly spheres revolve around the sun in particular orbits. This model is called as Helio-Centric theory. (Helio means Sun)

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