VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY
Unidentified flying object (UFO) and lights in a cloudy sky, computer artwork. This UFO is known as a 'Black Triangle', and theories explaining what it is range from an alien spacecraft to top secret military aircraft. There are several aircraft that use triangular delta-wing designs (such as the US B-2 Spirit stealth bomber), and these lights look like aircraft landing lights. There is no evidence that conclusively shows that alien spacecraft have ever visited Earth.
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