NASA's Deep Space Network is a series of antennas used to communicate with far-away spacecraft. But the DSN doesn't send and receive sounds; it actually uses radio waves to communicate with spacecraft. To help students understand how these signals are used to send data back and forth across the solar system, this activity teaches how signals travel at the speed of light and are decoded. Fortunately, the signals students create in this lesson are a bit slower. They will realize pretty quickly th