Crossword Genius

What had a major impact on this puzzle's theme? (8)

Ross

I believe the answer is:

asteroid

(Other definitions for asteroid that I've seen before include "Minor planet" , "circling rock" , "Small planet orbiting the Sun" , "Small planet revolving round the sun" , "Small celestial body composed of rock and metal" .)

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