Throughout mentions in Middle English, it was gradually restricted to its current, religious meaning. In Old English, the term heaven was used to describe the observable expanse above the earth. The Norse term is also the source of the Old English scēo, which shares the same Indo-European base as the classical Latin obscūrus, meaning 'obscure'. The word sky comes from the Old Norse sky, meaning 'cloud, abode of God'. Due to human activities, smog during the day and light pollution during the night are often seen above large cities. Certain birds and insects, as well as human inventions like aircraft and kites, can fly in the sky. ![]() Lightning and precipitation are also visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. At night, the Moon, planets, and stars are similarly visible in the sky. The Sun and sometimes the Moon are visible in the daytime sky unless obscured by clouds. The night sky appears to be a mostly dark surface or region spangled with stars. The daytime sky appears blue because air molecules scatter shorter wavelengths of sunlight more than longer ones (redder light). ![]() In some cases, such as in discussing the weather, the sky refers to only the lower, denser layers of the atmosphere. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the sky bowl) appearing flatter during the day than at night. Usually, the term sky informally refers to a perspective from the Earth's surface however, the meaning and usage can vary. The celestial sphere is conventionally divided into designated areas called constellations. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting. In the field of astronomy, the sky is also called the celestial sphere. It may also be considered a place between the ground and outer space, thus distinct from outer space. It includes the atmosphere and outer space. The sky is an unobstructed view upward from the surface of the Earth.
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