Top 10 UFO mysteries
5. Maury Island incident
Maury Island incident occurred when two men saw donuts shaped objects flying over the sky. It was much popularized however later it was ruled out as hoax.
1. WOW signal
WoW signal isn’t any UFO but it was a strong narrowband signal detected in 1977 it lasted for 72 seconds. The signal has not been detected again after that. From what object did it came is not yet determined.
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