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Stephen Hawking, perhaps the world’s best-known cosmologist, theoretical physicist and author, has once again issued a warning on Earth’s search for extraterrestrial life, repeating his advice that humans should think twice before we make contact.
Dr. Hawking expressed his concerns on a newly released 25-minute online film called "Stephen Hawking’s Favorite Places," in which he takes viewers on a virtual tour of his five favorite places in the universe. As the camera peers into black holes and looks at star systems on the program, Hawking cautions that while life might be out there, it might not be a pleasant thing for humanity to discover.
“We should be wary of answering back,” Hawking said, echoing sentiments he has previously expressed. “Meeting an advanced civilization could be like Native Americans encountering Columbus — that didn’t turn out so well.”
http://www.csmonitor.com/Science/2016/0924/Stephen-Hawking-warning-If-aliens-call-should-we-answer