Nicolaus Copernicus : A Sun-Center​ed Solar System (A Short Biography for Children)Astronomer Nicolaus Copernicus identified the concept of a heliocentric solar system, in which the sun, rather than the earth, is the center of the solar system.Best Children's Biographies : Write a biography for kids by thinking about what a child would enjoy learning about a person, covering important achievements, creating an outline and getting help from a child reader.