No doubt there is other life forms in the universe......fact is there is not a shred of evidence they have ever visited this planet!!!
When folks think about alien life, the conclusion is always something kind of like us.
If we were to find microbes deep in the soil of Mars or plankton like creatures under the ice of Europa, that is alien life because it’s not from here.
So when I think about the vastness of the universe, I cannot buy into the idea that every planet circling a sun’s habitable zone is a sterile world.
If you discover intelligent life forms through their transmission of electromagnetic communications, then we have been “discoverable” for only some 112 years. So the maximum distance our “signs of life” could have been detected is 112 light years, not far at all. During those 112 years, there have been several occasions when civilization could have thrown itself back into a Stone Age.
Complex cellular life has been around for two billion years, multicellular life for one billion years, intelligent life for 1.5 to .2 million years depending on your definition of intelligent.
Considering the odds for and against anyone discovering us, at least through our electromagnetic communications, are so slim as to be non- existent, we’re a lot better off looking for planets with the conditions for life as we know it than listening for alien transmissions.