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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 ?
Mr Hilder,a veteran of more than 200 jumps, was taking part in a competition with seven other sky-divers at last week's National Championships of the British Collegiate Parachute Association.
The military sky-divers have successfully demonstrated their capabilities during the Interaction - 2014 drills in Karaganda region, Peace Mission - 2014 drills in China, and the trainings of the National Security Committee of Kazakhstan in 2014.
GOOD SPORTS: World champion gymnast Beth Tweddle, main picture, will open Liverpool Day at Aintree on April 12, joined by The Christians, top, and the Red Devils sky-divers, left
The sky-divers all wore T-shirts supporting the Lucas Holyfield Appeal.
Viewers saw 19 sky-divers leap from 14,000ft over Spain and spell out the word Honda as they plunged to the ground.
The mixture of risk-taking, profound thought and witty eloquence made listening to Earmarks a bit like watching five sky-divers discussing Jacques Derrida on the way down before casually pulling their rip-cords with seconds to spare.
The owners of two skydiving businesses - Eugene Sky-divers and Wright Brothers Sky-diving - eventually lost their long-standing right to land customers across the runway from their businesses at the north end of the airport.
As the sky-divers were exiting the plane, Tamsin was knocked out," said a spokesman.
THIS is the moment a new world record was set for the biggest formation drop by wing suit sky-divers.
Owners of both skydiving companies, Eugene Sky-divers and Wright Brothers Sky-diving, expressed interest then in trying to buy the drop zone land.
Come early - family entertainment includes sky-divers, a funfair, go karting, live music and street entertainers.
The first picture from 1973 shows three sky-divers who made a sponsored parachute jump for charity and handed over pounds 381 to American singer Tony Bennett.