Social media is awash with rumours the explosive files could finally expose the truth over whether alien life exists. It has long been speculated that highly advanced alien species have already visited Earth.
Governments across the world have repeatedly denied this, insisting there is no evidence to support this.
But the existence of top secret locations, most famously the US airbase commonly known as Area 51 in Nevada, has fuelled speculation that governments are not telling the entire truth.
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