Professor Stephen Hawking has suggested that we avoid contact with any alien beings that we might discover. He is of the view that it is "perfectly rational" that intelligent life could exist elsewhere. It is quite possible that life exists on other planets within our solar system or other star systems within the Milky Way. There is, however, no hard evidence and it is pure speculation whether any kind of life exists anywhere else other than the earth.
SETI ( the search for extraterrestrial intelligence) has been scanning the heavens for over a decade and have found nothing. Any intelligent life could be tens of light years away.
Even if intelligent beings were on another planet it would be very difficult for them to travel across many light years to get to earth. It would not just be a technical problem; it would cost them a lot of money and resources and it may not be worth the investment to come here. There would probably be enormous social and psychological difficulties to be overcome. Who would volunteer for such a long journey? They would probably send a robot. I doubt that we will ever meet an intelligent alien face to face.
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