Not Nothing!
Spherical Space is contained within the Observable Geocentric Universe CMBoSphere.
Revelation 21:15-17 The one who spoke with me had a gold measuring rod to measure the city, and its gates and its wall. 16 The city is laid out as a square, and its length is as great as the width; and he measured the city with the rod, fifteen hundred miles; its length and width and height are equal. 17 And he measured its wall, seventy-two yards, according to human measurements, which are also angelic measurements.