Crossword Genius

Space-related prefix (5)

Ross

I believe the answer is:

astro

(Another definition for astro that I've seen is " Indicates a heavenly body".)

I've seen this clue in the USA Today.
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.