This activity models grazing incidence reflection by using students as the “sea of electrons” provided generally by metallic bonding on the surface of a metal. A tossed ball is used to represent a photon of light and the ball tosser represents... (View More) the object giving off the photon. This activity is designed to illustrate that different photons may be absorbed or reflected, depending upon their energy to illustrate how the telescope utilizes grazing optics to focus X-rays.The activity requires balls of various sizes (ping pong ball, golf ball, tennis ball, basketball or bowling ball). The activity guide includes discussion questions and instructions for using the video "Building the Coolest X-ray Satellite: Astro-E2" in the classroom. (View Less)