Neil deGrasse Tyson, for one (14)

I believe the answer is:

astrophysicist

(Other definitions for astrophysicist that I've seen before include "One studying properties of stars and interstellar matter" , "One studying composition of stars, etc" , "space expert" , "... [ASEROID DISCOVERED] by such a man, perhaps" .)

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

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