Why Is The Sky Blue?
Answer:
The sky is blue because it is tinted by the oxygen contained in the atmosphere.
During the day time the sky appears to be Blue in colour, because of the atmosphere scattering sunlight. The sky is a portion of the atmosphere or of external space noticeable from the surface of the earth.
The blue colour emerges because of Rayleigh scattering. As pallid shifts through the atmosphere, the majority of the longer wavelengths pass directly through. Nevertheless, most of the shorter wavelength light is taken in by the gas molecules. As you see nearer to the horizon, the sky looks much paler contained by colour. To reach to the human eye the spread blue light has to outdo through more air, hence some of it gets distributed away again in added directions.
This causes less blue light to conquer your eye, and so the colour of the sky close to the horizon comes into view as white.
Because of the atmosphere (the air all around us) light from the sun doesn't travel to us within a straight line. If there were no atmosphere on floor, the sun would look like a bright orb in a black sky (that is how the sun does look from the moon).
Instead the light from the sun collides next to air particles (molecules) in the atmosphere. The sun emit light in a range of colours, most simply categorised as red, green, blue, ultraviolet. Red have the longest wavelength, which is bigger than most of the molecules in the atmosphere. As a result, red light passes straight through nouns molecules, it doesn't get reflected somewhere else (or 'scattered').
Green light have a shorter wave-length than red, and gets scattered a little. Blue buoyant though has a wave-length that is very close to indistinguishable size as an oxygen atom. So the blue light bounces right off the oxygen atoms (Rayleighy scattering) in our nouns in any possible direction. Ultra-violet light gets even more strewn, but we don't see in UV so we wouldn't know.
Because blue light is coming at our eyes from all directions our brains in recent times averages it out and says 'That sky is blue'.
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