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It looks like Amy captured the phenomenon last night. A friend of hers provided the scientific explanation. A green flash is a phenomenon in which part of the sun appears to suddenly change color for about 1 or 2 seconds. The brief flash of green light is seen more often at sunset than at sunrise.This fleeting spectacle is caused by the refraction of sunlight, which is particularly significant at sunset and sunrise, when the light travels through more of the Earth's atmosphere. The atmosphere bends the sunlight passing through it, separating the light into its different colors, much like a prism bends and splits sunlight into rainbows, according to Cornell University. The various colors of light bend different amounts based on their wavelengths; shorter wavelengths (blue, violet...