On Thursday morning, some UFO-looking clouds appeared in Beijing, capital of China.

These UFO clouds, also known as lenticular clouds, are mostly formed at the troposphere, which is the lowest layer of the Earth's atmosphere. Lenticular clouds are typically aligned perpendicular to the direction of wind. When the air is stable, the strong wind acts as a force and blows the cloud into a lens shape.

(Cover image via CGTN. Editor: Wan Hailun.)

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