An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth.
ɐn ɐstɹˈɑːnəmɚɹ ɪz ɐ sˈaɪəntɪst ɪnðə fˈiːld ʌv ɐstɹˈɑːnəmi hˌuː fˈoʊkəsᵻz ðɛɹ stˈʌdiz ˌɔn ɐ spəsˈɪfɪk kwˈɛstʃən ɔːɹ fˈiːld aʊtsˈaɪd ðə skˈoʊp ʌv ˈɜːθ.