2154, the RDA Corporation is mining a valuable mineral called  unobtanium  on Pandora, a lush, Earth-like moon with an atmosphere poisonous to humans in the  Alpha Centauri  star system. [ 10 ]  Pandora is inhabited by the  Na'vi , 10-foot-tall ( 3 m ), blue-skinned,  sapient  humanoids [ 32 ]  who live