Ok i been hearing alot of stuff about Jenova theory, she was sent from space through time probably by a more intelligence race maybe they sent her to kill other planets or maybe they were killed by Jenova and she move out to different planets from a parralel universe(if u notice bugugahen in cosmo cannon space room there is a blackhole,possible of going through time), her purpose is to land on a planet and kills all life on it then sucks out all its life energy source out. On her arrival she crash landed on Earth then creates a huge crater (known as North Crater) the cetra upon knowing the impact race over to the northern crater, and saw jenova, though she was a friend from outter space befriended her, she then dosent respect this friendship bull[img]/xxx.gif[/img][img]/xxx.gif[/img][img]/xxx.gif[/img][img]/xxx.gif[/img] did something that wiped out almost all of the cetra race and somehow died. Also i heard of a Theory that the Cetra race is Once more advance in technology, and i mean way more than shinra present, that the Cetra once itself was from a different space time and crashlanded on earth, then build there settlements there, if you could remembered correctly there is a b49 jet plane at the bone village, which couldnt been possibly created by shinra or the wutai.