China: Mysterious Cloud Spotted Over Sky Of Jinan, Shandong

This is the unusual moment that a perfectly rectangular "bilayer cloud" floating solo in a clear sky, resembling a "placed" object. On November 26, 2024, in Jinan, Shandong, the video clearly showed the cloud’s edges sharply defined against the backdrop of blue, sparking intrigue and speculation. Experts suggested that the shape might have been due to the contrails of a high-speed aircraft. When aviation fuel, primarily composed of hydrocarbons, burned, the hydrogen in the fuel combined with oxygen to form water vapor. This vapor rapidly condensed into ice crystals in the cold upper atmosphere, creating a streaking effect that from the ground appeared smooth and thread-like. While the exact cause was still a topic of discussion, it left a lasting impression on those who saw it.

Japan successfully launches Epsilon-3 rocket

Japan successfully launches Epsilon-3 rocket

Photo taken Jan. 18, 2018, shows contrails left in the sky by the Epsilon-3 rocket carrying a small radar satellite that was successfully launched from the Uchinoura Space Center in Kimotsuki, in southwestern Japan's Kagoshima Prefecture. (Kyodo) ==Kyodo

Japan successfully launches Epsilon-3 rocket

Japan successfully launches Epsilon-3 rocket

Photo taken Jan. 18, 2018, shows contrails left in the sky by the Epsilon-3 rocket carrying a small radar satellite that was successfully launched from the Uchinoura Space Center in Kimotsuki, in southwestern Japan's Kagoshima Prefecture. (Kyodo) ==Kyodo

Czech News Agency (CTK) logo, brand, public service agency, airliner, airplane, contrail, contrails

Czech News Agency (CTK) logo, brand, public service agency, airliner, airplane, contrail, contrails

Sign, logo of Czech News Agency (CTK), public service agency, is seen on the building of the agency headquarters in the Opletalova street, Prague, Czech Republic, on December 7, 2009. (CTK Photo/Martin Sterba)

Lines from aircraft in the sky, traffic, overflight, contrail, contrails

Lines from aircraft in the sky, traffic, overflight, contrail, contrails

Lines from air traffic over the Czech Republic, Czech Republic, 2019. (CTK Photo/Rostislav Kalousek)

Sunset, wood, condense trail, contrails

Sunset, wood, condense trail, contrails

Sunset behind the forest ridge. Orange shine on remains of clouds. White condensation traces from aircraft on a dark blue sky. Silhouettes of tree crowns. (CTK Photo/Roman Krompolc)