"Of course it is possible that UFO's really do contain aliens as many people believe, and the government is hushing it up"

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We only have to look at ourselves to see how intelligent life might develop into something we wouldnt want to meet. 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.

— Stephen Hawking