a ouvir RYUICHI SAKAMOTO: the sheltering sky theme aqui
"Blue skies are produced as shorter wavelengths of the incoming visible light (violet and blue) are selectively scattered by small molecules of oxygen and nitrogen. The violet and blue light has been scattered over and over by the molecules all throughout the atmosphere, so our eyes register it as blue light coming from all directions, giving the sky its blue appearance."
retirado daqui
mas para quem for mais exigente e quiser uma explicação mais pormenorizada recomendo este
imagem encontrada aqui
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