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 second installment of the set , students use the mathematical constant pi to determine what fraction of a signal from Voyager 1 – the most distant spacecraft – reaches Earth. Materials Pi in the Sky 2: Hear Here worksheet – download PDF Pi in the Sky 2 answer key (fourth problem) – download PNG Backgroun