The "Pi in the Sky" math challenge gives students a chance to take part in recent discoveries and upcoming celestial events, all while using math and pi just like NASA scientists and engineers. In this problem from the set, students use the mathematical constant pi to calculate the amount of potential rainfall in a cloud. Materials Pi in the Sky 6: Cloud Computing worksheet – Download PDF Pi in the Sky 6 answer key – Download PDF Background This 3D image from the MISR instrument on NASA's Terra