*Rocket scientist (9)

I believe the answer is:

geologist

(Other definitions for geologist that I've seen before include "Specialist in the earth's history recorded in rocks" , "One studying the earth's structure" , "One studying rocks" , "Specialist in the history of the earth in rocks" , "Specialist in the physical history of the earth" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.