Draw a circle with an orange marker or paint, centered on the poster board or butcher paper. The circle should take up most of the paper; leave room around the outside for labeling
Draw a line down from the top of the circle to the middle with your black marker. Then, draw a line from the middle out to the left edge of the circle, making a right angle. Then, draw along the inside of the orange circle, from the end of the line at the left edge to the end of the line at the top.
Drop down two inches from where the arc ends at the top of the circle, and draw a similar arc that ends two inches from the end of the line going out to the left from the middle.
Draw a line from the center, out to the right but angled slightly downward from horizontal. Go about halfway to the edge of the circle and stop. Then, draw an arc that goes back up from that point to the top of the first line you drew. Drop down two inches, and draw an arc that goes back down to this line on the right. Then, draw an arc from the end of this line around to the end of the line that goes from the middle to the left edge of the circle. Draw another arc about two inches inside that one. The circle should now look like a sphere with a section removed.
From the middle, go up two inches and start an arc that goes down to the left. Then, draw arcs from that point around to the line pointing down and to the right, and then back up to the vertical line. The area inside these arcs is the core.
Color the circle outside the arcs orange with the marker or paint. If you use paint, use wavy effects off the end to indicate "prominences." These are gas arcs that shoot out from the sun periodically; they can go hundreds of thousands of miles.
Color the area between the core and the inner arc bright yellow. This is the "radiative zone," which sends radiation out into space. It's a very hot spot, with temperatures as high as 15 million degrees Celsius.
Color the area between the inner arc and the outer surface a darker yellow or orange. This is the "convection zone," which is much cooler -- as cool as 6,000 degrees Celsius.
Draw a wavy outline around the outside of the entire circle to indicate the corona, which is the sun's outer atmosphere, extending millions of miles out into space. Other parts of the atmosphere include the photosphere, which is the visible part of the sun, and the chromosphere, a redder section of the atmosphere (because of the presence of excited hydrogen giving off radiation).
Write names for the parts of the sun listed previously, and draw lines connecting the name to the correct area of the sun.