Which of these is a scientific field concerned with the origins and future of life in the universe?

I really do wonder whether or not the existence of life outside of our solar system would change anything here on the third rock. I mean, the way things are today, a space ship could land on the white house lawn and half the country wouldn't believe it. But I like that there are people looking...

I want to know more about this subject!! My library is 2 blocks away and I am going to look into it!!