“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)

Impala pictured in the Kruger National Park on December 7, 2007 in Mpumalanga, South Africa. (Photo by Warren Little/Getty Images)

“For a bouquet of flowers”. Photographs made ​​in the last hours of the day. A goat is directed by a dangerous way to eat a small bouquet of flowers. Location: España, Barcelona, Montserrat. (Photo and caption by Renato Lopez Baldo/National Geographic Traveler Photo Contest)

ATTENTION! All pictures are presented in high resolution. To see Hi-Res images – just TWICE click on any picture. In other words, click small picture – opens the BIG picture. Click BIG picture – opens VERY BIG picture.

A couple stands next to a poster depicting Dutch politician Geert Wilders and Russian President Vladimir Putin kissing, at a metro station in Amsterdam April 3, 2016. (Photo by Cris Toala Olivares/Reuters)

An undated handout photo made available by the Zerynthia Association shows the pupa of an amicta moneiba, a recently discovered species of moth endemic to La Gomera and El Hierro islands in the Canary Islands, Spain (issued 01 July 2020), as those two islands pulled apart from the rest of the Canary Islands 2.5 million years ago. The Institute of Evolutionary Biology of the Spanish National Research Council (CSIC) and the Zerynthia Association have recently discovered two new moth species in El Hierro and La Gomera. (Photo by Yeray Monasterio/Zerynthia/EPA/EFE)

Dolly the Chihuahua dog dressed as Alice in Wonderland is photographed during an Alice in Wonderland and Charlie and the Chocolate Factory themed Furbabies Dog Pageant at Jodhpurs Riding School in Tockwith, North Yorkshire, Sunday September 6, 2020. (Photo by Danny Lawson/PA Wire via AP Photo)

Alex Lual (R) in action against Trent Girdham (L) during the undercard bouts ahead of the WBO Asia Pacific Super Welterweight Title Bout between Tim Tszyu and Takeshi Inoue at Qudos Bank Arena, in Sydney, New South Wales, Australia, 17 November 2021. (Photo by Dan Himbrechts/EPA/EFE)

A sifaka lemur eats leaves at the Berenty Reserve in Toliara province, Madagascar, February 15, 2022. (Photo by Alkis Konstantinidis/Reuters)