Because if Rayzor which support the round earth haven't built a universe that is as depict by science, its very likely that the flat earth, the flat plane is our universe.
of course, humanity can build the gravity and the universe as depict by science but I think it unlikely that we live in such a project, I think we live in flat plane, and it is absolutely expanding and stretching and growing to infinite, so no worry about places to build homes and other buildings.
If rayzor didn't build our universe it is likely that the universe is a flat plane.