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'No little green men here': How Area 51 became associated with UFO and alien sightings

INSIDER Logo By Susanna Heller of INSIDER | Slide 2 of 11: 
  Very little is known about the highly classified, remote base,
  making it the perfect object of fascination and conspiracy.

Area 51 is an active Air Force base in Nevada.

Very little is known about the highly classified, remote base, making it the perfect object of fascination and conspiracy.

© Barry King/Getty Images

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