Some of us haven't thought about the order of the planets since we watched 3-2-1-Contact on PBS. Back then, you memorized the phrase, "My very educated mother just served us nine pizza pies." And there was a little song to go with it. No, I won't sing it for you.
But since astronomers keep adding and subtracting planets, it's now totally beyond me. Fortunately, a fourth grader from Montana has come up with a solution. She won a contest for the best mnemonic device for remembering all eleven planets in their orbital order. It involves elephants.
Get schooled at the Great Falls Tribune:"Riverview student's memory aid brings order to the solar system"