Professor Avi Loeb, who is head of astronomy at Harvard University, reiterated that it is indeed “quite possible” that we have interacted with alien technology without realising. Professor Loeb made the astonishing revelation this week to Express.co.uk. He explained: “It’s quite possible that we did detect some traces of other civilisations but haven’t recognised them.

“The reason is we often imagine what we know already - what we have developed ourselves. “And until we develop the appropriate technology, we would not recognise it out there in the sky.” The esteemed astronomer elaborated that there was nothing far fetched about the search for alien life. He said: “Of course, we should be open-minded and not dismiss the opportunity to look at the sky.

Alien Life: Harvard Professor Avi Loeb explained to Express.co.uk how aliens could have visited Eart