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 . Many of these particles were ejected by comets . Zodiacal light is easiest to see in September and October just before sunrise from a very dark location.
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