Thursday, July 23, 2015

The Sun is Yellow Because the Sky is Blue

I was reading in Strange Universe by Bob Berman about the colors we perceive and learned something I hadn't known before. All the colors that we see on Earth do not actually originate here at all. They are a result of the colored photons created in the center of the sun. Our sun is actually colored pure white but radiates the colors of the spectrum. Around sunset the sunlight refracts, or bends, due to the varying thicknesses of the atmosphere and separates into individual colors of the spectrum side by side creating the beautiful background that we get to witness.
    The sky is blue because the shorter blue wavelengths of the sun's light are more easily scattered by the air molecules in Earth's atmosphere than the wavelengths of other colors. This causes the atmosphere, heavily populated by air molecules, to appear blue. As a result of the blue sky, the sunlight we see is actually missing some of its blue wavelengths. The sun thus appears yellow instead of white. However there is a way to see the true color of the sun that is seen by astronauts when above Earth's atmosphere. When light illuminates a white surface, such as snow, the two mixtures of light combine (the blue wavelengths from the  blue sky and the rest of the spectrum from the yellow sun). The snow thus becomes a mixture of the two colors and appears to our eyes as white.

The Paradoxicality

http://blog.chron.com/sciguy/wp-content/blogs.dir/1898/files/2013/12/Clipboard01ss.jpg
http://blog.chron.com/sciguy/wp-content/blogs.dir/1898/files/2013/12/Clipboard01ss.jpg

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