(nynorsk) planetologi betyr engelsk

planetary science▼(branch of astronomy)
noun
[UK: ˈplæ.nɪ.tri ˈsaɪəns] [US: ˈplæ.nə.ˌte.ri ˈsaɪəns]

planetology▼(the study of planets)
noun
[UK: plˌanɪtˈɒlədʒi] [US: plˌænɪtˈɑːlədʒi]