This is a spoiler thread, I know the game is like decades by now but still. There is one lingering question XD
Will Shion and co ever reach Earth ? Kinda wonder how far they are from the original Earth XD. With UMN gone all that exist was “manual flight”
This seems like one of those things we can never really know, which is aggravating. In my mind, they will, because no one can stop me from thinking it. 
They will! This is the best possible ending
I like to think they eventually get there and she finds Kos-Mos again.
If it didn’t happen in Shion and co’s lifetime, I would hope that someone would continue their work and eventually get there in their honor.
I have this mental image of the Elsa reaching Earth, and Shion finding KOS-MOS asleep at the bottom of Lake Turkana. The Maiden arrives, and the android ascends. 
g
great ending
Is there a possibility, Kosmos sleeps, but Shion wakes up in her body?