A rainbow is an optical and meteorological phenomenon that causes a almost continuous spectrum of light to become visible in the sky when the Sun shines onto droplets of moisture in the Earth's atmosphere. It takes the form of a multicoloured arc, with red on the outside and violet on the inside. More not often, a double rainbow is seen, which includes a second, fainter arc with colours in the opposite order, that is, with violet on the outside and red on the inside.
Even though a rainbow spans a continuous spectrum of colours, conventionally the full sequence of colours is most commonly cited and remembered as red, orange, yellow, green, blue, indigo and violet.
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