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What is Area 51?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

Area 51 is an active U.S. Air Force military installation located at Groom Lake in southern Nevada. It is not accessible to the public. It is administered by Edwards Air Force Base, which is in southern California. Area 51 has been the focus of numerous conspiracy theories involving extraterrestrial life.