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A Quadruple Rainbow

Rainbows form when sunlight enters and reflects out of raindrops. For a quadruple rainbow to be possible, sunlight has to pass through the raindrops four times. Quadruple rainbows are dim because direct sunlight has to pass through heavy rain so many times for it to happen.

Quadruple rainbows are also very rare, so you, along with most other humans, have likely not seen four natural rainbows at once in the sky. Someone has luckily captured it in this wonderful picture!

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