Introduction: Show children a prism. (I borrowed one from my local preschool!) If you do not have access to a prism, make your own with beveled glass or a glass of water. Explore and discuss the rainbows that are created.
Game: Color Song (Tune: "Muffin Man")
Story: What is the Sun? by Reeve Lindbergh (a second story can be used to fill a longer story hour.)
What Is the Sun?