Explain the significance of the heliocentric theory. what is it ? what did it change?

The heliocentric theory is the theory that everything in the solar system revolves around the sun, in contrary to the geocentric theory, where they believed that everything revolved around the Earth. The heliocentric theory changed our viewpoints on the universe, and space and science. This theory was made by Nicolaus Copernicus, and backed up by Galileo Galilei.

The heliocentric theory is a model in which the Sun lies at the center of the universe and Earth and the other planets revolve around it. This theory was first proposed by Nicolaus Copernicus in 1543. This theory displaced the older theory presented by Ptolemy, which was a geocentric model. This model placed the earth at the center of the universe. Heliocentric theory is viewed as the basis for modern astronomy and the Scientific Revolution.

d.prevent the spread of communism outside of eastern europe.

number 4. should be the correct answer