Students will model the mathematics used to communicate with spacecraft. They will use sound waves as an analog for light waves and parabolic transmitters and receivers to represent antennas on spacecraft and on Earth. Materials 1 large golf umbrella (parabolic in shape) (Optional) Additional umbrellas of various sizes (parabolic in shape) Empty 1- to 3-liter soda bottles (one per student) Scissors Mobile device with a metronome app Long metric measuring tapes or trundle wheels Ear antenna patt