Editing Red (section)

=== Color of sunset ===
{{main|Sunset#Colors}}
[[File:Crimson sunset.jpg|thumb|right|Sunsets and sunrises are often red because of an optical effect called [[Rayleigh scattering]].]]
As a ray of white sunlight travels through the atmosphere to the eye, some of the colors are scattered out of the beam by air molecules and [[Atmospheric particulate matter|airborne particles]] due to [[Rayleigh scattering]], changing the final color of the beam that is seen. Colors with a shorter wavelength, such as blue and green, scatter more strongly, and are removed from the light that finally reaches the eye.<ref name="saha">{{cite book |author=K. Saha |title=The Earth's Atmosphere – Its Physics and Dynamics |year=2008 |publisher=Springer |isbn=978-3-540-78426-5 |page=107}}</ref> At [[sunrise]] and [[sunset]], when the path of the sunlight through the atmosphere to the eye is longest, the blue and green components are removed almost completely, leaving the longer wavelength orange and red light. The remaining reddened sunlight can also be scattered by cloud droplets and other relatively large particles, which give the sky above the horizon its red glow.<ref name="guenther">{{cite book|editor-last=Guenther |editor-first=B.|title=Encyclopedia of Modern Optics |publisher=Elsevier|year=2005|isbn=9780123693952|volume=1 |pages=186}}</ref>