Sky is part of the atmosphere or space that can be seen from the Earth's surface, birds, insects, planes and kites were flying in the sky. There are several reasons why the sky is very difficult to define in the daytime sky appears blue due to the air, causing the scattering of sunlight. Not because they have blue objects above the earth. Because of this, it is difficult to define that the sky is nothing. The sky is sometimes defined as the area of the Earth's atmosphere with a gas-tight. At night Mostly it appears as a black. Or sometimes studded with stars. But if we say that all we see is the sky. It becomes clear that the sky is the universe, which is different from the first day when we see in the daytime. We can see the sun when no cloud cover. At night (And sometimes during the day), we can see the moon and the stars, planets, natural phenomenon, we can see a rainbow in the sky was cloudy and Aurora bolt and Precipitation it. Can be seen during a storm. Often we can see smoke in the daytime, and rays of light at night because of the pollution caused by human activities in astronomy. The sky is called the celestial sphere. That is a huge imaginary sphere. Rotation of the spindle and hub together with the world. Celestial sphere is divided into areas called constellations.
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