CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Flying saucer cloud. Unidentified Flying Objects (UFOs) are observed in a variety of places and times. Suggested explanations range from weather phenomena (such as this cloud) to secret military aircraft. UFO-shaped clouds are most likely to be lenticular clouds, which are lens-shaped and form at high altitude.
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