JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Condensation trails, vapour trails or contrails, in the morning sky over Oxfordshire, UK. At high altitudes the water vapour emitted as a product of the jet engine's combustion raises the relative humidity of the surrounding air past saturation point and the resulting water droplets freeze into visible ice crystals.
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