A compilation of several different fields of science--biology, astronomy, paleontology among other--that studies life and seeks to answer important questions like "How were we formed", "Are there other life forms", "What's for lunch" and "What is life". http://nai.arc.nasa.gov/poster/poster_i … -FINAL.pdf
Astrobiology (or exobiology) is the study of the origin, evolution, distribution, and future of life in the universe, besides Earth. This interdisciplinary field encompasses the search for habitable environments in our Solar System and habitable planets outside our Solar System, the search for evidence of prebiotic chemistry, laboratory and field research into the origins and early evolution of life on Earth, and studies of the potential for life to adapt to challenges on Earth and in outer space.
Astrobiology makes use of physics, chemistry, astronomy, biology, molecular biology, ecology, planetary science, geography, and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from the biosphere on Earth