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This is an accepted version of this page This is the latest accepted revision, reviewed on 10 December 2024. Color "Sky (color)" redirects here. For other uses, see Sky Blue (disambiguation). Sky blue Common connotations boys, daylight, water, air, paleness Colour coordinates Hex triplet #87CEEB sRGB B (r, g, b) (135, 206, 235) HSV (h, s, v) (197°, 43%, 92%) CIELCh uv (L, C, h) (79, 46, 223 ...
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 .
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.
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.
The power spectrum of the cosmic microwave background radiation temperature anisotropy in terms of the angular scale (or multipole moment). The data shown comes from the WMAP (2006), Acbar (2004) Boomerang (2005), CBI (2004), and VSA (2004) instruments. Also shown is a theoretical model (solid line).
This is an accepted version of this page This is the latest accepted revision, reviewed on 4 December 2024. Variety of the color blue For other uses, see Shades of Blue (disambiguation). "Shade of Blue" redirects here. For the song by Black Rebel Motorcycle Club, see Shade of Blue (song). For the R&B/funk band, see Shade of Blue (band). Blue Wavelength 440–490 nm Common connotations ...
A truly dark sky has a surface brightness of 2 × 10 −4 cd m −2 or 21.8 mag arcsec −2. [ 9 ] [ clarification needed ] The peak surface brightness of the central region of the Orion Nebula is about 17 Mag/arcsec 2 (about 14 milli nits ) and the outer bluish glow has a peak surface brightness of 21.3 Mag/arcsec 2 (about 0.27 millinits).
An example in everyday life is the blue colour sometimes seen in the smoke emitted by motorcycles, in particular two-stroke machines where the burnt engine oil provides these particles. [1] The same effect can also be observed with tobacco smoke whose fine particles also preferentially scatter blue light.
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