cosmochemistry
noun
cos·mo·chem·is·try ˌkäz-mō-ˈke-mə-strē 
: a branch of chemistry that deals with the chemical composition of and changes in the universe
cosmochemical
ˌkäz-mō-ˈke-mi-kəl
adjective cosmochemist
ˌkäz-mō-ˈke-mist
noun 
Example Sentences
Recent Examples on the Web Some hope that turning to cosmochemistry, the study of the compositions of cosmic objects, might reveal the answer. 
Quanta Magazine, 3 Nov. 2021 Scientists like Alexander hope that combining new ideas of cosmochemistry with modeling of the early solar system could provide some useful answers. Quanta Magazine, 3 Nov. 2021
Quanta Magazine, 3 Nov. 2021 Scientists like Alexander hope that combining new ideas of cosmochemistry with modeling of the early solar system could provide some useful answers. Quanta Magazine, 3 Nov. 2021 Word History
Etymology
Greek kosmos universe
First Known Use
1940, in the meaning defined above