If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.

Stephen Hawking's views on Alien visits

Stephen Hawking

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823 Using e-mail, I can communicate with scientists all over the world.
778 Science predicts that many different kinds of universe will be spontaneously created out of nothing. It is a matter of chance which we are in.
778 Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.
792 My work and my family are very important to me.
809 In Britain, like most of the developed world, stem-cell research is regarded as a great opportunity. America will be left behind if it doesn't change policy.

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