With US Congress seeing testimonies from "UFO witnesses" this year, there seems to be more evidence than ever that alien intelligence has made contact attempts here on Earth. Scientists disagree on the 'evidence' (Image: Susumu Yoshioka via Getty Images)

With US Congress hearing evidence from "UFO witnesses" this year, it appears there's mounting proof that extraterrestrial intelligence has attempted to make contact with Earth.

But what are the pivotal moments? When did experts believe they'd discovered cast-iron evidence that our little green friends truly existed? Here are five instances that appeared to revolutionise our grasp of the cosmos, reports the Irish Star

1. Wow! signal.

The first remarkable moment belongs to the aptly dubbed 'Wow!' signal. Back in 1977, Ohio

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