A radio-controlled flying witch makes a test flight past a moon setting into clouds along the pacific ocean in Carlsbad, California October 8, 2014. Reuters was invited to photograph the testing of the life sized device by inventor Otto Dieffenbach lll. (Photo by Mike Blake/Reuters)

This photograph, taken in Cognocoli-Monticchi on the French Mediterranean island of Corsica on November 14, 2023 shows lenticular clouds above Corsican mountains. (Photo by Pascal Pochard-Casabianca/AFP Photo)

“Contrails (short for “condensation trails”) or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets or, if the air is cold enough, tiny ice crystals”. – Wikipedia

Photo: An airplane leaves a vapor trail as it flies in front of he moon on January 17, 2007 above Hanover, Germany. (Photo by Alexander Hassenstein/Getty Images)

Clouds cover the sky over the Ernst-Taehlmann-Park housing estate after a thunderstorm in Berlin, Germany, Thursday, March 11, 2021. (Photo by Markus Schreiber/AP Photo)

A lenticular cloud is seen during sunrise from Gokmen Aerospace Training Center (GUHEM) in Bursa, Turkiye on January 19, 2023. (Photo by Halit Mirahmetoglu/Anadolu Agency via Getty Images)

Dark clouds hang over the Great Belt Bridge connecting Nyborg and Halsskov, Denmark, on June 26, 2023. (Photo by Mads Claus Rasmussen/Ritzau Scanpix via AFP Photo)

An old car passes by while dark clouds are seen due to the tropical storm Idalia in Havana, on August 28, 2023. (Photo by Yamil Lage/AFP Photo)

A couple walks across the Francis Scott Key Bridge as the setting sun lights up the clouds in Washington, Friday, October 30, 2020. (Photo by J. David Ake/AP Photo)