as we all knw that Earth is the only planet where life exist. I think that there should be life on other planets tooo to reduce the population of Earth
It affects each person differently. It might seem intresting to some on the other hand some may become scared. Some would want to know about the other life forms. Thier similarities and differences compared to us humans. Human is always attracted to knowledge to learn something what we dont know. We will want to know about their While some might think about alien invasion. Like mostly shown in movies or described as in books. 
It will affect our believes mostly.