Answer & explanation:
Heliocentrism is the theory that proposes that the sun is at the center of the universe, replacing Geocentrism, which is the belief that the earth is the center of the universe. The geocentric model was the prevailing theory in ancient Greece, throughout Europe and other parts of the world for centuries.
The main reasons why heliocentrism was difficult to accept is that geocentrism had been proposed for a long time, making it difficult for people who had been used to the old model for centuries to understand.
In addition, the Roman Catholic Church fought tirelessly to prevent the heliocentric model from being accepted, condemning scientists of heliocentrism, such as Nicolaus Copernicus and Galileo Galilei for heresy.