Talk:Story and History/@comment-81.218.198.86-20141202133351/@comment-7645613-20150125021211

this is due to "the great collapse" that is mentioned, after the fall of the Orokin the solar system fell into a slum where technology, and the people with the know-how to operate it, vanished or were very few in number. eventually factions started re-discovering Orokin tech and the corpus especially, integrated it into their very culture. 2 thousand years may sound alot, but you have to remember that during the great collapse it is assumed that any humanoid race at the time were severely reduced in number, and along with tenno being forced into deep sleep, any humanoid race would have a long time to take to recover to achieve space flight, let alone manage to traverse solar rails.