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sky,

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.

sky

[skī]
(astronomy)
In the daytime the apparent blue dome resting on the earth along the horizon circle; at night the blue becomes nearly black.

sky

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 ?
He left a suicide note calling the skyjackers "absolutely justified".
SYLVESTER Stallone is a professional mountain climber and rescue expert, who gets roped into a scheme masterminded by criminal skyjackers.
Davis was asked about skyjackers and made his famous ``hang 'em at the airport'' remark.
The proposed changes are driven by criticisms of the FBI for failing to detect the 9-11 skyjackers before they acted.
Algerian pilot Lotfi Raissi, 27, suspected of training four US skyjackers, was also denied bail after his appearance in the same court.
Within a short time, this "sports czar" could facilitate soccer tournaments where teams with names such as the Baghdad Bombers and the Saudi Skyjackers can compete, where a soccer ball and the players' feet and heads will be the only "weapons" for the youth to work with.
ALGERIAN pilot Lotfi Raissi, suspected of training four of the US skyjackers, arrives at a British court yesterday.
THIS is Algerian pilot Lotfi Raissi, suspected of training four of the US skyjackers.
Four key suspects linked to the 19 skyjackers booked flights on United Airlines this Saturday.
In Florida, where residents were already spooked by reports that last month's skyjackers had inquired about renting crop-dusters, authorities had received more than 100 calls about suspicious powders over the past few weeks; they all turned out to be innocuous substances such as plaster dust.