I think it’s likely aliens exist, but unlikely any alien species will be what we expect. I highly doubt we will see humanoid “little green men” or anything like the majority of science fiction portrays. Each planet is vastly different in just our solar system. The vast differences in environments across the galaxy will yield vastly different paths of evolution. We are only looking for “life” that fits our narrow definition based on Earth’s species - we have likely already missed signs of alien life.
I think it’s likely aliens exist, but unlikely any alien species will be what we expect. I highly doubt we will see humanoid “little green men” or anything like the majority of science fiction portrays. Each planet is vastly different in just our solar system. The vast differences in environments across the galaxy will yield vastly different paths of evolution. We are only looking for “life” that fits our narrow definition based on Earth’s species - we have likely already missed signs of alien life.