Fighters of Wagner private mercenary group pull out of the headquarters of the Southern Military District to return to base, in the city of Rostov-on-Don, Russia on June 24, 2023. (Photo by Alexander Ermochenko/Reuters)

Light painting on the beach at Walton-on-the-Naze in Essex, United Kingdom on April 25, 2023 using burning steel wool spun around on a rope sending sparks flying. (Photo by Kevin Jay/Picture Exclusive)

An alpaca Satsuki looks at a pet dog at a park while Alpaca Fureai Land's staffs walk the alpaca during early morning in Tokyo, Japan on June 21, 2023. (Photo by Kim Kyung-Hoon/Reuters)

Waxwings in Balham south London on December 31, 2023. There has been a huge influx of this erruptive species this year. This probably due to severe storms and a shortage of food in their native Scandinavia in the Autumn. (Photo by Jack Hill/The Times)

People dressed in traditional costumes sing Christmas carols as they gather to celebrate Orthodox Christmas at a compound of the National Architecture museum in Kyiv, Ukraine on January 7, 2022. (Photo by Valentyn Ogirenko/Reuters)

A group of women wearing dresses representing flags of the Allied powers (left to right: the USA, France, Britain and the Soviet Union) outside the Eglise de la Madeleine on VE Day in Paris, 8th May 1945. (Photo by Keystone/Hulton Archive/Getty Images)

is a concentrated solar power plant with a molten salt heat storage system. It is located within the city limits of Fuentes de Andalucía in the province of Seville, Spain.

“NASA's Pathfinder, Pathfinder Plus, Centurion and Helios Prototype were an evolutionary series of solar- and fuel-cell-system-powered unmanned aerial vehicles. AeroVironment, Inc. developed the vehicles under NASA's Environmental Research Aircraft and Sensor Technology (ERAST) program. They were built to develop the technologies that would allow long-term, high-altitude aircraft to serve as “atmospheric satellites”, to perform atmospheric research tasks as well as serve as communications platforms”. – Wikipedia

Photo: The solar-electric Helios Prototype flying wing is flies over the Hawaiian islands of Niihau and Lehua during the first solar-powered test flight July 14, 2001 from the U.S. Navy's Pacific Missile Range Facility on Kauai, HI. The 18-hour flight was a functional checkout of the aircraft's systems and performance in preparation for an attempt to reach sustained flight at 100,000 feet altitude later in the summer. (Photo Courtesy of NASA/Getty Images)