It's 7:50 a.m., deep into the "night" in Kyle Stumbaugh's first-period astronomy class at Mehlville High School.
A Milky Way candy bar dangling from the ceiling represents its namesake galaxy. A red ornament, Mars. A gold and white ornament, a twinkling star. A shriveled balloon, a shrunken sun. A black and white paper circle, the moon. Two Styrofoam balls, Jupiter and Saturn, minus its rings.
"They fell off," Stumbaugh said, shaking his head. Stumbaugh's blue, squinty eyes are fixated on his homemade solar system. "Isn't it something?" he asks. Even better, he's teaching astronomy as a single course, not as part of a general science class. The Mehlville district …