DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Boeing 737 taking off at sunset. The orange plumes behind the aircraft's wings are caused by sunlight refracted by the hot exhaust gases from the jet engines. Sunsets are orange because the sunlight travels through more of the atmosphere and other colours (such as blue), which are scattered more than red colours, do not reach the eye.
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