The Van Allen belt prevents humans to pass through. Even the shuttle astronauts claimed seeing like stars in their eyes and it was the radiation effects on their retina. Even the space station only flies at an average altitude of 248 miles (400 kilometers) above. Claims of a Firmament would also limit altitude. The Antarctic also has some relationship to the theory. There is a lot of activity going on there with a few countries. The travel to the Antarctic is prohibited. You are not free to go there exploring. You require Gov't permission.