UFO like spherical structure of unknown energy
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Floating abstract UFO ball, spherical structure of unknown energy found on Mars, 3d illustration. Tumbleweed shape

"An unidentified flying object (UFO) is an object observed in the sky that is not readily identified. Most UFOs are later identified as conventional objects or phenomena." Wikipedia, The Free Encyclopedia, "Unidentified flying object", https://en.wikipedia.org/wiki/Unidentified_flying_object
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