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Beautiful Science - The sky IS NOT BLUE.

Have you ever wondered why the sky above us is blue, and not red or green or even polka dot pink and brown? Well It has to do with a combination of light and how we perceive colour. Let’s have a look. NAME OUR GINGER CAT IN THE COMMENTS! Facebook - https://facebook.com/beautifulscience... Instagram -   / beautiful_sci   Twitter -   / beautsciencevid   Visible light is a small part of the electromagnetic spectrum, a form of energy waves that range in frequencies, from longer radio waves, to shorter gamma rays. These waves are all around us, but our eyes can only see a certain section of this we call the visible light spectrum. The waves in the visible light spectrum define how humans perceive colour. The sun gives off light that is white. There are actually 7 colours in the form of waves that combine to make this white light. These are the same as the colours of the rainbow, red, orange, yellow, green, blue, indigo and violet. You can test this yourself by shining light through a prism. These colours all have different wavelengths, Red being the longest, through to violet which is the shortest. All the colour wavelengths travel in a straight line at the speed of light from the sun towards us on Earth. When the light gets to Earth a small percentage of the waves hit the gases and particles in the atmosphere, mainly oxygen and nitrogen. The shorter the wavelengths the more likely they are to hit a particle and scatter. This scattering is called Rayleigh scattering. Red is more likely to pass by the particles, whereas blue is more likely to scatter. Blue wavelengths are in fact 16x more likely to scatter in the atmosphere that red wavelengths. So when you are looking up at ther sky it is millions of these scattered blue waves reaching your eyes that you are seeing. But doesn’t indigo scatter more than blue and violet scatter even more than indigo, meaning the sky should appear violet?? Yes indigo does in fact scatter the most but our eyes are adapted to see the colours in the middle of the light spectrum more clearly than the outer colours, meaning that we see blue a lot easier than indigo and violet. If you were to use a prism or see a rainbow, you will notice the central colours are a lot more visible and vibrant. This means our eyes pick up the blue scattering more than indigo and violet, and the reason the sky appears blue. So there you go, that is why the sky is blue. You might now be interested in knowing why then Sunsets are not blue, but hues of red, orange and yellow? Watch our video here on it to find out. Thank you for watching and please subscribe below for more. #sky #blue #lightspectrum