The sky
Ever wondered why the sky is blue?
The question "Why is the sky blue?"is one of the most often asked questions by young and old people alike. To find the answer,we frist have to look up into the sky at the earth's atmosphere. If the earth had no atmosphere,the sky above would be black like the darkness of space. The earth's atmosphere is mainly composed of the gases nitrogen,oxygen and cardon dioxide as well as other materials like water vapour and dust. These ars an important factor in making the sky appear blue. They are also half of the answer to this elusive question. Let's look at the other half.
Let there be light
To better explain this natural phenomenon,it is important consider light in moer detail.Light is made up of a spectrum of colours in "white" light are different - red light has a longer"wavelength"(think of a wavelength as how intense or powerful a colour is),while the shortest wavelengths are on the violet end of the spectrum.
Sunlight collides with the elements in the atmosphere and the different wavelengths of light scatter throughout the sky.The colours with shorter wavelengths are scattered more,and,since violet and blue are the shortest wavelengths,the sky should appear violet. However,our eyes are more sensitive to blue light than they are to violet light,so we perceive the sky as blue.