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Contacting aliens may 'spell end of mankind' and all efforts should stop, experts warn
various videos that have emerged of US Navy aircraft encountering "unidentified aerial phenomena".It also comes amid intense fascination behind UFOs fuelled by the imminent release of the Pentagon's eagerly-anticipated report into the subject."Chances are, we should all be grateful that we don't yet have any evidence of contact with alien civilisations," Mark wrote."Attempting to communicate with extraterrestrials, if they do exist, could be extremely dangerous for us."Mark made the comparison between a possible alien encounter and Christopher Columbus' arrival in North America, where an older civilisation may be vulnerable to the more technologically advanced Europeans.Joe Gertz, a Search for Extraterrestrial Intelligence astronomer,
