Crossword Genius

Pertaining to vast astronomical systems (8)

Ross

I believe the answer is:

galactic

(Other definitions for galactic that I've seen before include "More than stellar" , "Relating to, eg, the Milky Way" , "Relating to large star systems" , "Referring to the star system" , "To do with large independent systems of stars" .)

I've seen this clue in The Times.
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