Je was op zoek naar: civilisations (Engels - Japans)

or interplanetary civilisations.
更に、技術力や、社会的能力が発達し、 他の星や、惑星に移動できるようにまでなった文明を持つ

which anthropologists call "the cradle of civilisations".
人類学者は "文明の揺りかご"と

and people talk about the war as this epic battle between civilisations.
人々は... あの戦争を こう表現する "文明の衝突"

its continuing mission... to explore strange new worlds... to seek out new life and new civilisations... to boldly go where no man has gone before.
) 任務を継続し ( its continuing mission... )

civilisation
文化