The sky is everything that lies above the horizon and surface of the Earth, including the atmosphere and outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting.
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The sky (also sometimes celled
celestial dome) is everything that
lies above the surface of the Earth,
including the atmosphere and outer
space. The sun and sometimes the
moon are visible in the daytime sky
unless obscured by clouds. At night,
the moon, planets, and stars are
similarly visible in the sky.