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What is the sky made of?

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April 17, 2010 2:15AM

At night, the sky is made up of stars and the darkness between them. In daytime, this darkness disappears as the sun's rays make the molecules of our atmosphere appear to be blue. Clouds are not really 'part' of the sky, they are just masses of water-vapour which move across the backgroud of the sky. In reality, there is no such thing as 'sky' - the atmosphere is there all the time, but at night we can see through it.