who made the heliocentric model
Galileo Galilei was the first astronomer to use a telescope to study the heavens. Galileo made a number of observations that finally helped convince people that the Sun-centered solar system model (the heliocentric model), as proposed by Copernicus, was correct.
This invention of the heliocentric theory was discovered by Nicolaus Copernicus. It was important becuse it was the first theory that said that the universe does not revolve around the earth.