Astrochemists are scientists who study the chemical composition of celestial objects such as stars, planets, and comets. If you're looking for other words to describe these experts, you could use terms like astrophysicist, astrobiologist, space chemist, or cosmologist. While these terms have slightly different meanings, they all overlap with astrochemistry to some extent. Astrophysicists, for instance, focus on the physical laws that govern celestial bodies, while astrobiologists study the possibility of life in space. Meanwhile, a space chemist is a chemist who studies the chemical reactions that occur in space. Generally speaking, anyone interested in the intersection of chemistry and outer space could be described as an astrochemist, regardless of their particular focus.