Harvard professor explains we may have ALREADY been visited by aliens for THIS reason ALIENS may have already visited Earth without us even noticing, according to a top Harvard professor. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Blue Moon 2018: How the Blue Moon rising could make you GO MAD tomorrowBlue Moon 2018: Is there a blue moon TONIGHT? How can I watch full moon?Warning issued over Tomb of Jesus Christ: Scientists alert of 'catastrophic' findingTiangong-1 latest: China's space station set to plummet to Earth this weekendGood Friday shock: Bible WRONG Jesus NOT born in stable but home-birthed - TheologistEU helps create new VIRTUAL REALITY so you can feel holograms and 'invisible objects'