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"We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet," Hawking said. "I imagine they might exist in massive ships ... having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach.”
Hawking said an attack by interstellar predators is just one of the dismaying possibilities in the search for intelligent life beyond Earth. Another possibility is that intelligence itself might be inimical to life. Hawking pointed out that humanity has put itself on the edge of its own destruction by creating nuclear bombs and other weapons of mass destruction.
"If the same holds for intelligent aliens, then they might not last long," he said. "Perhaps they all blow themselves up soon after they discover that E=mc2. If civilizations take billions of years to evolve, only to vanish virtually overnight, then sadly we've next to no chance of hearing from them."