The New Jerusalem is part of the New Earth. The old Earth has “passed away”. No satellites in orbit. Also the New Earth/Jerusalem has New Physics. The New Jerusalem is not trying to turn itself into a sphere like you would expect.
The problem is not that there is evil in the world. The problem is that there is good. If it was just evil who would care? That’s just the way it is. Since there is good in the world, that creates choice, and choice creates problems.