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The Search for Extraterrestrial Intelligence – SETI – project looks for alien life in a one, main specific way – scanning for radio signals deliberately beamed towards earth from distant stars.
But two astronomers suggest that we may be missing evidence much closer to home.
Two scientists at Arizona State University have suggested that alien life may have ‘left traces on the moon in the form of an artifact or surface modification of lunar features’ – and that alien ‘footprints’ on the moon would last far longer than radio signals.