How To Make A Model Of The Sun? It Must Be 1to2 Square Feet. Including Core,radation Zone,convection Zone, Photosphere, Sunspots, &* Prominence. It Must Be In Color.

Use styrofoam balls of various sizes and an old small basketball.

The basketball is orange a color of a star if you let the air out of the basketball and then slit it open you could insert a styroform ball into it to represent the core.   Bring an inflated basketball exactly the same as the first.   
You start with the inflated version and then go to the version with the styrofoam ball in it.   The styroform ball can be spray painted as well if necessary.