If aliens ever visit us, I think the outcome would be much as when Christopher Columbus first landed in America, which didn’t turn out very well for the Native Americans.
Shouldn’t we be content to be cosmic sloths, enjoying the universe from the comfort of Earth? The answer is, no.
In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.
A single message from space will show that it is possible to live through technological adolescence…It is possible that the future of human civilization depends on the receipt of interstellar messages.
Our sun is one of 100 billion stars in our galaxy. Our galaxy is one of the billions of galaxies populating the universe. It would be the height of presumption to think that we are the only living things within that enormous immensity.
Werner von Braun
In our time this search [for extraterrestrial life] will eventually change our laws, our religions, our philosophies, our arts, our recreations, as well as our sciences. Space, the mirror, waits for life to come look for itself there.“
Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying.
Arthur C. Clarke
Science Writer and Futurist
I think the surest sign that there is intelligent life out there in the universe is that none of it has tried to contact us.