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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 ?
The Skyrocket was never right for carrier operations.
Buy the Juniper Skyrocket for just pounds 8.95 each or buy two for pounds 17.90 and we will send you a further one free.
Carter "allowed" interest rates to skyrocket as Churchill "allowed" troops to retreat from Dunkirk--it was the best each of them could manage at the moment.
According to IDC, the real opportunity in this market rests with transaction-based revenues, which will skyrocket from $700,000 in 1999 to $825 million in 2004.
While early projections estimated that parity would cause insurance premiums to skyrocket, the Congressional Budget Office projects that enactment of mental-health parity legislation would result in premium increases of less than 1%.
Although [NO.sub.x] emissions from Europe and North America are leveling off, Asian output is poised to skyrocket due to industrialization.
Devaluation of the Brazilian currency can cause the market to drop one week and surprisingly strong corporate earnings can cause it to skyrocket the next.
After watching her stress levels skyrocket, Finley quit her job last year and sought professional counseling.
As for China, the average person downs a mere five bottles a year; but with 1 billion thirsts to quench, all indications are that figure should skyrocket.
Close to the galaxy's center, the speeds of orbiting matter skyrocket to 400 kilometers per second, pushing the emissions to the far red and far blue.
New York is the only state that has the law the contractors say has caused general liability insurance to skyrocket over the last few years, in some instances as high as 300 percent.