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Contrail Clutter over Georgia
Credit: MODIS, Terra Satellite, NASA
Explanation: Artificial clouds made by humans may become so common they change the Earth's climate. The long thin cloud streaks that dominate the above satellite photograph of Georgia are contrails, cirrus clouds created by airplanes. The exhaust of an airplane engine can create a contrail by saturating the surrounding air with extra moisture. The wings of a plane can similarly create contrails by dropping the temperature and causing small ice-crystals to form. Contrails have become more than an oddity - they may be significantly increasing the cloudiness of Earth, reflecting sunlight back into space by day, and heat radiation back to Earth even at night. The effect on climate is a topic of much research.
Notice all the trails in this pic and realize that you are viewing these trials from a high viewpoint. This means the width of these trails is far larger than you might at first imagine. Also keep in mind that a "contrail" - water vapor, doesn't spread from a thin trail to one far larger as these clearly show, NOR do they persist long enough for such a picture to be taken showing so many. It "should" dissipate within minutes of being formed.
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