The "Pi in the Sky" math challenge gives students a chance to find solutions to real-world problems all while using math and pi just like NASA scientists and engineers. In this problem from the seventh installment of the set, students use the mathematical constant pi and physics to calculate how long the Kuiper Belt object Arrokoth takes to orbit the Sun. Materials Pi in the Sky 7: Cold Case – Download PDF Pi in the Sky 7: Cold Case answer key – Download PDF (also available as a text-only doc )