The chance of it existing somewhere is pretty big. However, our galaxy is huge so the chance of ever encountering them is pretty slim for now. I don't really expect us to find something until we develop a working sort of FTL technology. Since achieving this is probably still a few hundred years off I'm personally a bit sceptic whether we'll ever reach this point with all the problems we're facing here on earth.
I really believe we should focus on development of technology and infrastructure that would allow a large amount of people to go live on for instance Mars. This would allow us to focus on the development of FTL technology without the chance of dying before we complete it and it would probably boost additional development in space technology as well.
The chance of it existing somewhere is pretty big. However, our galaxy is huge so the chance of ever encountering them is pretty slim for now
Just 500 years ago, Europeans didn't know about America. It may turn out that aliens bump into us by accident and we find out that they were right around the corner the whole time. Or it is possible that the aliens have the FTL technology to get to us from a point far enough away that our satellites can't see them yet.
I really believe we should focus on development of technology and infrastructure that would allow a large amount of people to go live on for instance Mars. This would allow us to focus on the development of FTL technology without the chance of dying before we complete it and it would probably boost additional development in space technology as well.