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 by how much a spacecraft needs to slow down to get into orbit around Jupiter. Materials Pi in the Sky 3: Gravity Grab worksheet – download PDF Pi in the Sky 3 answer key (fourth problem) – download PDF Background Determ