astrochemistry
Scientific field studying chemical elements and compounds in space, including molecular clouds, stars, planets, and comets.
Astrochemistry is the study of molecules that exist in space.
Often used interchangeably with 天体化学, but 宇宙化学 may emphasize broader cosmic chemistry including interstellar medium, while 天体化学 focuses more on specific celestial bodies.
Compound of 天体 (astronomical object) + 化学 (chemistry). A modern scientific term.