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The sky actually appears to be blue less than half the time. Some conditions under which the sky may not appear blue: During the night, the sky appears black. Without light from the sun creating Rayleigh scattering, the sky cannot be seen as blue, [3] except in certain conditions when the moon is up. [4] Clouds can obscure the color of the sky.
The blue sky spectrum contains light at all visible wavelengths with a broad maximum around 450–485 nm, the wavelengths of the color blue. Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere.
Another may insist that the color of the sky is aqua rather than blue, while providing spectroscopic analyses as part of an assortment of verifiable evidence to support their position. Simultaneously, they demand that other editors show equivalent support in reliable sources for the claim that the sky is in fact blue. While there are times when ...
View of the night sky in July The day's blue sky, clouds and the Moon. The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.
The cites are there for the attribution of why the sky is blue, not just because it's blue or else there'd be a sentence in that article with four cites that says "The sky is blue". And while the sky certainly only appears to be blue, ask anyone in the world what color the sky is, and you'll get the same answer, hence the ubiquity of the choice ...
The Rayleigh sky model describes the observed polarization pattern of the daytime sky. Within the atmosphere, Rayleigh scattering of light by air molecules, water, dust, and aerosols causes the sky's light to have a defined polarization pattern. The same elastic scattering processes cause the sky to be blue.
This means it packs together really well, and the absence of any wind on the surface — we've been over this, there's no atmosphere for wind — means those footprints won't degrade anytime soon.
Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.