Those who become astronomers usually have a broad background in maths, sciences and computing in high school.
ðoʊz hˌuː bɪkˌʌm ɐstɹˈɑːnəmɚz jˈuːʒuːəli hæv ɐ bɹˈɔːd bˈækɡɹaʊnd ɪn mˈæθs, sˈaɪənsᵻz ænd kəmpjˈuːɾɪŋ ɪn hˈaɪ skˈuːl.