The sky is everything that lies above the surface of the Earth.
In the field of astronomy, the sky is also called the celestial sphere. This is viewed from Earth's surface as an abstract dome on which the Sun, stars, planets, and Moon appear to be traveling. The celestial sphere is conventionally divided into designated areas called constellations. Usually, the term sky is used informally as the point of view from the Earth's surface; however, the meaning and usage can vary. In some cases, such as in discussing the weather, the sky refers to only the lower, more dense portions of the atmosphere.
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