Make education edible with a science lesson-based solar system cake. Though making a cake proportionate to the actual solar system would require a cake yards in length, a representative solar system can be made. To make the planets, opt for fondant. This edible, sugar-based cake decorating product is readily available at baking supply stores. Working with it is as easy as shaping clay.
Color 2 cups of the cake frosting black with food coloring or gel icing coloring, stirring with a spatula. Spread the colored icing to completely cover the top of a baked and cooled sheet cake still in the pan.
Break off a ping pong ball-sized piece of the fondant. Put on the disposable gloves and knead in yellow food coloring or gel icing coloring into the fondant to make the sun.
Flatten the yellow fondant into a round circle, 1/8-inch thick, with the bottom of a flat drinking glass or your palm.
Place the circle in the center of the cake for the sun.
Color two marble-sized pieces of fondant orange, and roll them into spheres for Mercury and Mars.
Mix yellow coloring into a piece of fondant the size of a large shooter marble to make Venus.
Combine blue into two fondant spheres the same size as Venus to make the Earth and Neptune.
Color another sphere the size of Earth green to make Uranus.
Mix orange into a large golf ball-sized sphere for Jupiter.
Make Saturn by shaping a sphere slightly smaller than Jupiter and coloring it green. Roll a piece of green fondant into a rope between your hands and wrap it around the green Saturn.
Roll a pea-sized ball of fondant, colored gray, to create Pluto.
Flatten all of the planets with the base of a drinking glass.
Arrange the planets around the sun in the middle of the cake in the following order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto -- from the closest to the sun toward the outer edge of the cake.
Sprinkle edible glitter or star-shaped sprinkles over the cake for a star field.