Editor's note: This collection is called Nine Planets because NO TAKE-BACKS! We learned in elementary school that there are nine planets in the solar system. We memorized them. We studied models that used little styrofoam balls to show the nine planets in extending order from the sun. We said over and over "My Very Educated Mother Just Served Us Nine Pizzas" to help us remember that order. And the "P" of "pizzas" is Pluto! So don't be coming around here with your "Pluto isn't really a planet" schtick. No take-backs. And get a cool Nine Planets wallpaper before you go.