A cyclist shops for a gift from a roadside open-air vendor during Valentine's Day celebrations amid the COVID-19 pandemic in Kamwokya, Kampala, Uganda on February 14, 2022. (Photo by Miriam Watsemba/Reuters)

Fans of Argentina react while watching the live broadcast of the Qatar 2022 World Cup final football match between Argentina and France in Buenos Aires, on December 18, 2022. (Photo by Luis Robayo/AFP Photo)

A participant prepares for the Red Bull Air Race World Championships in Abu Dhabi, United Arab Emirates on February 6, 2017. (Photo by Red Bull Content Pool/SIPA Press/Rex Features/Shutterstock)

U.S. President Donald Trump boards Air Force One to depart for Vietnam from Beijing Airport in Beijing, China on November 10, 2017. (Photo by Jonathan Ernst/Reuters)

Artist Kong Ning wears a wedding dress made from respirators to highlight concerns about air quality and pollution in Beijing, China on December 1, 2015. (Photo by Luo Xiaoguang/Xinhua Press/Corbis)

People react following an Israeli air strike on Palestinian houses, amid the ongoing conflict between Israel and the Palestinian Islamist group Hamas, in Rafah in the southern Gaza Strip on December 12, 2023. (Photo by Fadi Shana/Reuters)

“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)

A Royal Air Force search and rescue helicopter prepares to leaves RAF Valley as the search continues for the crew of cargo vessel The Swanland which sank off north Wales on November 27, 2011 in Anglesey, Wales. (Photo by Christopher Furlong/Getty Images)