地球人: an Earthling; a Terran

地球外: extraterrestrial area

terraforming (planetary engineering)

predicament, quagmire

earth; ground

earth, land, ground / a place, a region, a piece of land / territory, dominion / (of a crate, etc.) the bottom / (printing, of a page) the bottom margin

place, area

the ground / earth, dirt, mud, soil / the earth (as opposed to the heavens) / the ground or bottom of something (as of a price range)

an amusement park

a colony (region or governmental unit)