Stephen Hawking has been quoted as saying that it is perfectly
rational to assume intelligent life exists somewhere in the universe.
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But while the discovery of life on another world may sound exciting, Hawking also believes that if a race of beings were sufficiently advanced enough to reach us, they would pose a huge threat to everyone and everything here on Earth.
How will our first interactions with a visiting alien civilization take place? Observation would likely be followed by covert visitation by the aliens in order to judge our abilities and technological level even further. If man were to meet an alien race tomorrow, could our existing infrastructure cope? We have to assume that a sufficiently advanced civilisation is aware of the dangers of disease to both parties, so hopefully they'll have brought protection along for this intergalactic booty call. Whether or not an alien race shares our concepts of good and evil is hard to say, but that's probably how we'll judge them, so how can we be so sure they'll come to us with good intentions?