Big redpill incoming.
"Outerspace" is not space at all, it is water.
We are inside what the Bible calls a "Firmament" what NASA has deceptively named a "Van Allen Belt"
It's a giant extremely hardened clear material.
To house, experiment on and study air breathing life forms.
There are no humans on the other side of the world that are standing "upside down" but also magically "right side up" like some kind of cartoon.
It's a giant clear ball, half filled with water and the other half filled with oxygen.
We live on the land thats floating on the water.
Is it FLAT? No. It has a massive variance in heights above sea level.
Is Sea Level flat? YES! Inside our clear ball, the water level is for the most part 100% flat (there's waves, ripples, tsunami's that have height variance.)
It's a Simulation but not in a computer.
It's a physical simulation, carried out by an advanced water based species that actually looks quite humanoid.