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>For other uses, see Sky (disambiguation). The sky is (roughly) that part of the atmosphere or of outer space visible from the surface of the earth (or any other planet; see Skies of other planets).). Birds, 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 an opaque blue surface, but this is the result of the air refracting sunlight. 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. See more at Wikipedia.org...

[erm screen has a number of meanings: A screen can be a transportable or permanently mounted panel or connected series of panels intended to obscure or hide the space behind it, used for visual privacy. A screen can also provide physical protection.A window screen is a wire mesh that covers a window opening to keep out insects even when the window is open.A windscreen or windshield protects the driver of a vehicle from rain, insects and airborne debris.In naval ship formations, a screen of small, fast ships (such as destroyers) is used to protect larger ships such as battleships and aircraft carriers from attack by similar ships, torpedo boats or submarines. The objective of the screening ships is to destroy attackers before they can approach within torpedo range of the larger ships.Screen-printing, Silk-screening or Serigraphy is a method of printing and a screen is a piece of equipment used in this process. Screen can also describe a nonferrous metallic mesh used to provide electromagnetic shielding. A screen can mean a sieve. See more at Wikipedia.org...]