What is Astrochemistry? Like any of the big disciplines in science Astrochemistry is difficult to define and many aspects have to be considered. Any contribution towards a comprehensive picture of what Astrochemistry is is highly welcome. Please contact the Editor to submit your personal view or to get a link to your website . The Wikipedia definition (23.10.2007): Astrochemistry is the study of the chemical elements found in outer space, generally on larger scales than the Solar System, particularly in molecular gas clouds, and the study of their formation, interaction and destruction.