what is secret behind Area 51 ?
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Answer:
Area 51?
Area 51 refers to a map location and is the popular name for a United States Air Force base. It is at Groom Lake, a dry lake bed in the Nevada Desert, 85 miles (135km) north of Las Vegas.
What goes on inside is extremely secret. Members of the public are kept away by warning signs, electronic surveillance and armed guards.
It is also illegal to fly over Area 51, although the site is now visible on satellite images. The base has runways up to 12,000ft (2.3 miles/3.7km) long.
Image copyrightGETTY IMAGESAn alien-like statue displays a sign welcoming guests to the Little A'le' Inn restaurant and gift shop in Rachel, Nevada
Image captionSome local businesses in the small town of Rachel have embraced Area 51's association with alien mythology
The facility is next to two other restricted military areas: the Nevada Test Site, where US nuclear weapons were tested from the 1950s to the 1990s, and the Nevada Test and Training Range.
The entire range covers more than 2.9 million acres of land.
According to the US military, it represents "a flexible, realistic and multidimensional battle-space to conduct testing tactics development, and advanced training".
Why was it built?
Area 51 was created during the Cold War between the US and the Soviet Union as a testing and development facility for aircraft, including the U-2 and SR-71 Blackbird reconnaissance planes.
Although it opened in 1955, its existence was only officially acknowledged by the CIA in August 2013.
Four months after the CIA's disclosure, President Obama became the first US president to mention Area 51 publicly.
Explanation:
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