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 volume of the alien ocean on Jupiter's moon Europa. Materials Pi in the Sky 2: Frozen Formula worksheet – download PDF Pi in the Sky 2 answer key (third problem) – download PDF Background Beneath the icy surface of