earthly(as opposed to heaven) adjective [UK: ˈɜːθ.li] [US: ˈɝːθ.li]Hawaii is known as an earthly paradise. = Le Hawaii sono un paradiso terrestre.
terrestrial(of, relating to, or inhabiting the Earth or its inhabitants) adjective [UK: tɪ.ˈre.strɪəl] [US: tə.ˈre.striəl]Mercury is a terrestrial planet. = Mercurio è un pianeta terrestre.
terrestrenoun {m}
Earthling(inhabitant of Earth, as opposed to one of another planet) noun [UK: ˈɜːθl.ɪŋ] [US: ˈɝːθl.ɪŋ]We're all Earthlings. = Siamo tutti terrestri.
crosta terrestrenoun {f}
lithosphere [lithospheres](the outer layer of the Earth) noun [UK: ˈlɪ.θə.sfɪə(r)] [US: ˈlɪ.θə.sfɪər]
extraterrestrial(originating from outside of the Earth) adjective [UK: ˌek.strə.tə.ˈre.striəl] [US: ˌek.strə.tə.ˈre.striəl]Scientists have differing opinions about the existence of extraterrestrial life. = Gli scienziati hanno opinioni divergenti sull'esistenza di vita extraterrestre.
extraterrestrenoun {mf}
alien [aliens](life form of non-Earth origin) noun [UK: ˈeɪ.liən] [US: ˈeɪ.liən]
extraterrestreadjective {m} {f}
alien(pertaining to extraterrestrial life) adjective [UK: ˈeɪ.liən] [US: ˈeɪ.liən]