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:Robert F. Kennedy Jr.’s Brother and Sister Accuse Him of Spreading Misinformation on VaccinesNASA SHOCK: Telescope discovers BIZARRE galaxy created from the dawn of the universeGlobal Health: A New Ebola Vaccine Strategy in Africa: Smaller DosesEnd of the world: Why scientist chillingly warned human extinction 'could happen TOMORROW'NASA Hubble Legacy: Space agency creates cosmic 'history book of galaxies'Matter: In This Doctor’s Office, a Physical Exam Like No Other