 The Pacific Ocean captured by Apollo 11 crew Image by NASA, Apollo 11, via Wikimedia Commons. Licensed Public domain |
BlueBlue Blue Colour between violet and cyan on the visible spectrum of light This article is about the colour. For other uses, see Blue (disambiguation). Blue is one of the three primary colours in the RGB (additive) colour model, as well as in the RYB colour model (traditional colour theory).[2] It lies between violet and cyan on the spectrum of visible light. The term blue generally describes colours perceived by humans observing light with a dominant wavelength between approximately 450 and 495 nanometres. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another… (Source: Wikipedia)
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