The blue and green light’s wavelengths are at the other end of the spectrum and tend not to be visible. The red and orange light has the longest wavelengths, so they’re more penetrating and are what we see when the sun is low in the sky and the Earth’s atmosphere acts as a prism. When sunlight passes through a prism, it refracts, revealing the rainbow of colours exhibited by its differing wavelengths. However, there is a scientific explanation. Many believe the elusive marvel is a myth or the sort of story beach bartenders use to persuade you to buy another drink. If you ever find yourself with an uninterrupted view of the horizon at sunset or sunrise on an exceptionally clear day, you might, if you’re very lucky, catch a glimpse of a rare spectacle: the so-called green flash, when, for just a second or two, the upper edge of the sun becomes bathed in a vivid green hue. Image: Gail Johnson/Shutterstock Phenomena: the remarkable explained
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