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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.
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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 ?
Sky-high City will have 220 floors and provide housing, dining, shopping and medical services, but commentators have criticised the backers' ambitious construction schedule.
Those that remain may be problematic--so small that zoning laws prohibit a building large enough to amortize sky-high construction and acquisition costs.
To fly sky-high, these skaters need to build an extreme vertical velocity, or speed in one direction.
Then, so did entire industries, because of sky-high commodities prices, or recovering consumption, or suddenly easy financing.
"We had been booked over the Thanksgiving weekend, when travel and hotel expenses were sky-high, plus there was the overtime bill," she says, "and audiences just aren't thinking about dance during that holiday.
If you are happy with sky-high home costs, you should also thank environmental extremists.
In a "trendy" neighbourhood that teems with high-maintenance, tightly-wound, maxed-out urbanites, people have no compunction about hectoring him regarding their sky-high expectations, which generally he is not able to meet.
We can't resist and camp it up sky-high with the Sydney Opera House as our backdrop.
Conservative commentators like Paul Weyrich bemoaned the death of collective moral outrage when Bill Clintons popularity ratings remained sky-high despite the Lewinsky scandal and his subsequent impeachment.
With a focus on artistic integrity, and an avoidance of the blatant excesses of an industry overburdened with sky-high fixed costs, Hidden Beach manages to present a model of what a sensible, meaningful soulful music company can be.
Of course, that was before the independent dairy stores introduced the sky-high cones.
The days of sky-high public sector deficits as far as the eye can see must remain a thing of the past.