Is it a bird or a plane?
Remember ET? The alien from outer space who is abandoned on Earth? How do you think he got here? Via a UFO, of course. Once called flying saucer, the term UFO (unidentified flying object) was coined by Edward J. Ruppelt, a U.S. Air Force officer who led the Project Blue Book to document such phenomenon in the sky. UFOs are not common just to the modern era. The ancient Egyptians and Romans too speak of strange craft and lights descending from and ascending to the sky. With World UFO Day falling on July 2, here are four of the most famous incidents.
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