The sky is part of the atmosphere or space that can be seen from the earth"s surface, birds, insects, aircraft and was considered a kite flying in the sky. There are several reasons why the sky is difficult to define?In the daytime the sky appears blue because air is caused the scattering of sunlight. Not because there are blue objects above the earth. For this reason, so that it is difficult to define that the sky is anything. The sky was sometimes define a region of the earth"s atmosphere with gas tight, at night, the sky appears as a black. Or sometimes lined with stars. But if we say that all we see is sky. It will become that the sky is the universe, which is different from the first meaning when we see during the day.In the daytime. We can see the sun when there is no cloud at night (and sometimes in the daytime). We can see the moon, planets and stars on the phenomenon that we can see in the sky clouds, rainbows, and aurora. The lightning and precipitation, can be seen during a time of storm. Often we can see the smoke in the daytime and halo of light in the night because of pollution caused by human activities.In astronomy, the sky is called the blue sphere. That is the imaginary sphere of considerable size. Revolve rotate by a core and center together with the world. The blue sphere is divided proportional called constellation.Look at the sky of another planet. For the meaning of the sky in a different planet, and the moon in the solar system.
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