planetary(of or relating to planets) adjective [UK: ˈplæ.nɪ.tri] [US: ˈplæ.nə.ˌte.ri]
planetarionoun {m}
planetarium [planetaria](museum which displays images of space) noun [UK: ˌplæ.nɪ.ˈteə.rɪəm] [US: ˌplæ.nə.ˈte.riəm]John went to the planetarium. = John andò al planetario.