Sky

The sky is often defined as the place a person sees when he looks up from
the earth. Although almost everyone have seen it, the sky is hard to be
defined precisely. The concept of the sky, as it is applied here on earth,
can be generalized to mean the space seen when one looks upward from the
surface of any planet. The sky is also sometimes defined as the denser
gaseous zone of a planet's atmosphere.

On earth, the sky usually looks blue on a sunny day, turns orange and red
during sunrise and sunset, and becomes black at night. Some of the things
people see in the sky are clouds, rainbows, and aurorae. Lightning can also
be seen in the sky during storms. People also say that birds, airplanes, and
kites fly in the sky.

In the field of astronomy, the sky is also called the celestial sphere. This
is an imaginary dome where the sun, stars, planets, and the moon are seen to
be travelling in. The celestial sphere is divided into regions called
constellations. (See also Chinese constellation).

Many cultures ascribed strong religious qualities to Earth's sky, believing
it to be the home of the heavens and various deities.

Some expressions involving the sky:

   * A pie in the sky is something that is wanted very badly but is
     unobtainable.
   * When someone's assumptions and premises about everything he speaks
     about seem to radically different from everything you know and
     recognize about the world, you wonder what color the sky is in his
     world.
   * Similarly, because the blue hue of the sky during daytime is such a
     universally observed and understood phenomenon, people say "as sure as
     the sky is blue" to mean that something is an indisputable fact.
   * Blue skies are evoked as a symbol for good times, optimism and
     emotional peace.
   * To be sky-clad means to be in the nude.
   * Similarly, to go skying is a euphemism for stripping or streaking.
   * To show that there are no limits on what we can discover or accomplish,
     you can say, "The sky's the limit!"

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