Astronomers who serve as faculty spend much of their time teaching undergraduate and graduate classes.
ɐstɹˈɑːnəmɚz hˌuː sˈɜːv æz fˈækəlti spˈɛnd mˈʌtʃ ʌv ðɛɹ tˈaɪm tˈiːtʃɪŋ ˌʌndɚɡɹˈædʒuːət ænd ɡɹˈædʒuːət klˈæsᵻz.