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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 1 of 11: 
  Area 51 is a highly classified  area in Nevada.
  
  Currently, over 1 million people are actively plotting to
  "storm" the base in an attempt to see aliens.
  
  It's likely a joke, but it's brought up some serious
  questions about what goes on at the base.
  
  The US Government didn't acknowledge Area 51, also called
  Groom Lake, until 2013.
  
  From test planes to top-secrecy, here's what to know about
  the base that's become associated with aliens and UFOs.
  
  
    Visit INSIDER's homepage for more
    stories.
  

  Area 51 is highly classified, mysterious Air Force base in
  Nevada. It's been at the center of numerous conspiracy theories
  pertaining to aliens and UFOs. 

  Over 
  1 million people have responded to a Facebook event to "storm"
  the site. The event is supposed to take place on September 20
  with the end goal of getting the group to "see them aliens."

  The event is likely a joke, but it's also led to memes. From spy
  planes to tourist attractions, here's how the military base
  became associated with the theories.

  • Area 51 is a highly classified area in Nevada.
  • Currently, over 1 million people are actively plotting to "storm" the base in an attempt to see aliens.
  • It's likely a joke, but it's brought up some serious questions about what goes on at the base.
  • The US Government didn't acknowledge Area 51, also called Groom Lake, until 2013.
  • From test planes to top-secrecy, here's what to know about the base that's become associated with aliens and UFOs.
  • Visit INSIDER's homepage for more stories.

Area 51 is highly classified, mysterious Air Force base in Nevada. It's been at the center of numerous conspiracy theories pertaining to aliens and UFOs.

Over 1 million people have responded to a Facebook event to "storm" the site. The event is supposed to take place on September 20 with the end goal of getting the group to "see them aliens."

The event is likely a joke, but it's also led to memes. From spy planes to tourist attractions, here's how the military base became associated with the theories.

© Barry King/Getty Images

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