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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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.

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.

The Dream Encyclopedia, Second Edition © 2009 Visible Ink Press®. All rights reserved.


In the daytime the apparent blue dome resting on the earth along the horizon circle; at night the blue becomes nearly black.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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.
Dave Hickling, chief instructor with the British Parachute School based at Langar Airfield near Nottingham, said this was the first time a sky-diver had died in this country in suspicious circumstances.
Above: The site near Hibaldstow Airfield, Lincoln, where Stephen died and (right) despite the tragedy, sky-divers were back taking part in the sport yesterday
"I think I've had an accident." - British sky-diver Gareth Griffiths after he fell 13,000ft in Florida...
Handsome sky-diver Tim Reeve, 33, said: "All these accusations are extraordinary.
A PRIEST and four mourners were injured when sky-diver Jose Fernando plunged into a graveside funeral in Celaya, Mexico.
A sky-diver attempts to fly the parachute sketched by Leonardo da Vinci in the 15th Century.
The sky-divers exercised the jumps on the water and during the night time, annually increasing the number of drills by 500-600.
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.
The sky-divers in the team have been pulled out from several branches of the IAF such as technical, logistics, accounts and education.
Viewers saw 19 sky-divers leap from 14,000ft over Spain and spell out the word Honda as they plunged to the ground.