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apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the minute particles of dust and vapor in the earth's atmosphereatmosphere
[Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the science of
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. The rays with longer wavelengths (the reds and yellows) pass through most readily, whereas the shorter rays (the blues) are scattered. An excess of dust, especially in large particles, causes scattering of many rays besides the blue, and the sky "fades" and becomes whitish or hazy. The sky thus is clearest in winter, in the morning, after a rain, over a mountain, or over the ocean. Leonardo da Vinci experimented with light and attempted an explanation of the sky's blue color. The work on light and its behavior by Sir Isaac Newton, Lord Rayleigh, and other physicists provided explanations of rainbows, sky color, mirages, and other atmospheric phenomena.

What does it mean when you dream about the sky?

The sky usually signifies peace and freedom of expression when it is clear and blue. If cloudy and overcast, the sky may be forecasting sadness and trouble.


In the daytime the apparent blue dome resting on the earth along the horizon circle; at night the blue becomes nearly black.


1. the apparently dome-shaped expanse extending upwards from the horizon that is characteristically blue or grey during the day, red in the evening, and black at night
2. outer space, as seen from the earth
3. weather, as described by the appearance of the upper air
References in periodicals archive ?
Derek Cox will be once again competing in the free-flying sky-diving category at the 2010 United States Parachute Association National Skydiving Championships Sept.
Certified sky-diving instructors provide individualized training prior to each sky-diving adventure that focuses on safety and a series of hand signaling to communicate within the wind tunnel.
But sky-diving is only legal for 16 to 70-year-olds.
Mr Hilder successfully completed a jump on the Wednesday before joining friends at a fancy dress party at the sky-diving centre on Thursday night.
Meanwhile, a sky-diving expert said it would be relatively easy to sabotage a parachute jump.
Organisers of the event, staged at a sky-diving centre in Hinton-in-theHedges, Northants, hope to raise pounds 90,000 for the Cystic Fibrosis Trust.
Although they are in the middle of organising a big sky-diving competition, nothing has been too much trouble for them.
A woman is set to leap into the history books as part of a sky-diving record attempt.
I've always wanted to try sky-diving and it seemed a good way to raise money for a very good cause.
CRESWELL - Tiny Creswell Airport has become a battleground for, on one side, two sky-diving schools and, on the other, city officials and pilots who say they're worried that someone is going to get hurt.
Dilys Price OBE, Touch Trust director and sky-diving enthusiast, said the two were similar.
1 -- 3 -- color) Daily News columnist Tom Hoffarth falls through the sky during his sky-diving adventure over Lake Perris, in photos above.