Examples of topics or fields astronomers study include planetary science, solar astronomy, the origin or evolution of stars, or the formation of galaxies.
ɛɡzˈæmpəlz ʌv tˈɑːpɪks ɔːɹ fˈiːldz ɐstɹˈɑːnəmɚz stˈʌdi ɪŋklˈuːd plˈænɪtˌɛɹi sˈaɪəns, sˈoʊlɚɹ ɐstɹˈɑːnəmi, ðɪ ˈɔːɹɪdʒˌɪn ɔːɹ ˌɛvəlˈuːʃən ʌv stˈɑːɹz, ɔːɹ ðə fɔːɹmˈeɪʃən ʌv ɡˈælɐksiz.