... things fall into the realm of legend? In my story, the humans and non humans have been away from contact with Earth for enough time for their origin to have faded into the past. Gone, save for the odd little fairy tale and near derelict remnants of religions. But how much time must really pass for this to be? I have it brewing in my mind that it all depends on many, many factors, things that have happened since they left Earth. Was there a dark ages that obscured the history? Were the original settlers religious zealots who chose not to pass the information to the children? Did some kind of crisis happen which shifted focus away from maintaining a historical record. Many, many things. The reason it matters to me, and why I cannot just gloss it over as some uncountable number of years in the past is that I have reason to have some of the original technology still function to an extent. And I don't want to create "magical technology" that survives for millions of years and still powers on, a la the horrid remake of Planet of the Apes. I open the question to the floor for general discussion.