Crossword Genius

Their existence is debatable

Ross

I believe the answer is:

aliens

(Other definitions for aliens that I've seen before include "Foreigners or creatures from outer space" , "Foreigners or extraterrestrials" , "Life-forms assumed to exist beyond Earth" , "Beings from another planet" , "Strangers, extraterrestrials" .)

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