Five Signals that Led the World to Suspect Alien Life

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This year, the US Congress has heard testimony from "UFO witnesses", suggesting that there is more evidence than ever of alien intelligence attempting to contact Earth. But what were the key moments? When did scientists believe they had found undeniable evidence that our little green friends really exist? Here are five cases that seemed set to revolutionise our understanding of space. The Wow! Signal The first moment belongs to the aptly named '…