astrophysicist
US /ˌæs.troʊˈfɪz.ɪ.sɪst/
UK /ˌæs.troʊˈfɪz.ɪ.sɪst/
1.
astrofysicus
someone who studies astrophysics (= the study of stars and other objects in space using physical laws) :
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The director of the planetarium is a well-known and popular astrophysicist.