In this activity, students learn how light and energy are spread throughout space. The rate of change can be expressed mathematically, demonstrating why spacecraft like NASA’s Juno need so many solar panels. Materials Round balloon Ruler Marker (Optional) binder clip (Optional) microcontroller (e.g., microbit or similar device) (Optional) input and output devices (e.g., sensors, motors, speakers, etc.) Management Students may want to work in groups of two in order to be able to handle the unsea