Crossword Genius

Existential threat in 2021's "Don't Look Up" (5)

Ross

I believe the answer is:

comet

(Other definitions for comet that I've seen before include "Orbiting extraterrestrial body" , "Celestial object" , "potential space invader" , "bright star" , "Heavenly visitor" .)

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