Why the sky is blue?

@andben (1076)
Italy
February 10, 2007 7:50am CST
I mean, when it's evening you see that the sky is blue. My intuition is that the sky shold be black, like the space. Does anyone can explain me the reason?
3 responses
@shalwani (760)
• Pakistan
11 Feb 07
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight. The white light from the sun is a mixture of all colours of the rainbow. This was demonstrated by Isaac Newton, who used a prism to separate the different colours and so form a spectrum. The colours of light are distinguished by their different wavelengths. The visible part of the spectrum ranges from red light with a wavelength of about 720 nm, to violet with a wavelength of about 380 nm, with orange, yellow, green, blue and indigo between. The three different types of colour receptors in the retina of the human eye respond most strongly to red, green and blue wavelengths, giving us our colour vision.
2 people like this
@andben (1076)
• Italy
11 Feb 07
Thank you a lot. Your description is very interesting and precise.
@bhavesh80 (383)
• India
10 Feb 07
According to me, it is due to refecltion of water. As we know , we have 75% of water on earth. So when sun shines bright the color of water is reflected and sky appears bule. Similary after sun set , the sky turns black and as there is no light, there is no refelction.
2 people like this
@mbarryton (1872)
• United States
10 Feb 07
look at these sites you may find them helpful: http://www.sciencemadesimple.com/sky_blue.html http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html
1 person likes this
@andben (1076)
• Italy
10 Feb 07
thank you very much. The documents are very interesting.
1 person likes this
@mbarryton (1872)
• United States
10 Feb 07
your welcome :)