What do we know about ____ 51? Area 51 refers to a map ____ 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 ____ Vegas. What goes on inside is extremely ____. 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 ____ images. The base has runways up to 12,000ft (2.3 miles/3.7km) long.Are there aliens and flying ____ at Area 51? The secrecy surrounding Area 51 has helped fuel many ____ theories. Most famous is the claim that the site hosts an alien spacecraft and the bodies of its pilots, after they crashed at Roswell, New Mexico, in 1947. The US government says there were no ____ and the crashed craft was a weather balloon. Others claim to have seen UFOs above or near the site, while some say they have been ____ by aliens, and even experimented on, before being returned to ____.

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