Zodiacal Light . ... If the glow appears as a faint band of light running across the whole sky , you are probably seeing the combined light from the billions of stars that compose our Milky Way Galaxy . But if the glow appears triangular and near the horizon , you might be seeing something called zodiacal light . Pictured above , zodiacal light is just sunlight reflected by tiny dust particles orbiting in our Solar System . ... NASA Web Site Statements, Warnings, and Disclaimers . ...