Now cut out circles of different colors of construction paper to represent the layers of the sun. Choose a color of paper for the core, the radiative zone, the convective zone, the photosphere, and the chromosphere. Use your calculator to determine the ratios of the layers. For example, if you make the core 1 inch deep, your radiative zone is a little more than double the size of the core, so it would be 2 inches wide. The convective zone is about 65 percent the size of the radiative zone, so it would be just over 1.5 inches wide.