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The sky is the part of the atmosphere or of outer space visible from the surface of the earth (or any other astronomical object; see Extraterrestrial skies). Birds, insects, airplanes, and kites are often considered to fly in the sky. It is difficult to define precisely for several reasons. During daylight the sky has the appearance of a deep blue surface, but this is the result of the air scattering sunlight. [1] There is no "blue object" above the earth in any normal sense, so it is hard to say what object the sky is. The sky is thus sometimes defined as the denser gaseous zone of a planet's atmosphere. At night the sky has the appearance of a black surface or region scattered with stars. But if we then say that the sky is the entire visible universe, it would not be the same thing we see during the day.

During the day the sun can be seen in the sky, unless covered by clouds. In the night sky (and to some extent during the day) the moon, planets and stars are visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen in the sky during storms. As a result of human activities, smog during the day and light radiance during the night are often seen above large cities.

japiey, indoka28, isabela_sor, ALIRIZA ha puntuado esta nota como útil.

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Additional Photos by Vinushka Vinu (vinu) Silver Star Critiquer/Silver Note Writer [C: 36 W: 0 N: 11] (129)
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