Astrobiology is a relatively new field of study in science, one that has found a home in the curriculum of many major universities. It is a multidisciplinary field that draws participants from a range of scientific specialties: geology, physics, chemistry, engineering, computer science, and of course biology and astronomy. At the middle level, it is an exciting mix of topics and questions that can help students see how different fields of science can be integrated. The goal of this article is to define astrobiology and its aims, and to provide some ideas and inspiration for bringing it into a wide range of science classes.