Sky is part of the atmosphere or space visible from the earth, birds, insects, and that the plane was flying in the sky. There are many reasons that make it difficult to define the sky in the daytime sky appears blue because air is basically caused the scattering of sunlight. Not because a blue object above the Earth. For this reason it is difficult to define what is the sky. The sky is sometimes defined as a region of Earth's atmosphere at a gas tight. at night The sky appears basically black. Or sometimes studded with stars. But if we say that all we see is sky. It will become the sky, the universe, which is different from the first, when we see daylight in the daytime. We can see the sun only when there is no cloud cover. at night (And sometimes during the day), we can see the moon, planets and stars, phenomena that we can see a rainbow in the sky was cloudy and lightning and precipitation that Aurora. Can be seen during a storm. Often we can see the haze 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 an enormous imaginary sphere. Rotation with a spindle and hub shared with the world. The celestial sphere is divided into areas called constellations, see the planets sky. For the meaning of the sky, planets and moons in the solar system.
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