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Until now, many strange things that people call UFO (Unidentified Flying Object) have appeared in the sky.
![](https://image2.affcoder.com/storage/images/1688005642TNeTNISdrQihoaqZCitA.png)
Recently, residents of California, Nevada, and Arizona in the United States witnessed a strange trail of bluish light, shaped like a parachute about to deploy, appearing in the dark night sky.
![](https://image2.affcoder.com/storage/images/16880056432p9JeegstAtExK5Nmfon.png)
On the morning of February 25, 1942, several strange lights appeared in the sky over Los Angeles.
![](https://image2.affcoder.com/storage/images/1688005644EevAmMHJksTwwUUkcWfl.png)
The San Diego sky has witnessed the constant appearance of lights of various colors.
![](https://image2.affcoder.com/storage/images/1688005645f6bac1aLuXtCM7Yzq6ts.png)
A giant spiral appeared in the sky over Norway in 2009, causing many people concern and anxiety.