It looks bright enough to light a path. Now imagine this: you put that same Moon in a closet with the door shut and every lamp off. Would the closet glow? A flashlight would. A candle would. A mirror would not. So here is the puzzle: if the Moon looks so bright, is it making its own light like a lamp, or is it only bouncing light that already exists? Today you will learn how to tell a light maker from a light bouncer.