With Tsarion, and many others like him, there is no simple explanation that works. It looks like the earth was seeded, meaning a group obliterated the upper life, and started their own.

And then came others (like the Elohim) who messed further, and used humans as slaves to gather gold, or something.

And then the wars of Atlantis… and the floods and/or mud floods.

Lots of stories of the moon being rolled across the sky to be here.

I believe the barrier is either energetic, meaning we have to comprehend frequency to pass, or is a dimension. (like, you cannot go east enough to be east, you have to work in other dimensions to get out of east-west.)

But, why does NASA fake space? Could it be so people don't get the idea of building a tower to heaven? (or the firmament?) Whatever the reason, they keep it up.