Jerusem, the headquarters of your local system of Satania, has its seven worlds of transition culture, each of which is encircled by seven satellites, among which are the seven mansion worlds of morontia detention, man's first postmortal residence. As the term heaven has been used on Urantia, it has sometimes meant these seven mansion worlds, the first mansion world being denominated the first heaven, and so on to the seventh. ~ The Urantia Book, 15:7.5
Satania headquarters - Jerusem - and its satellite worlds.
Up close and bottom left - Mansion Sphere 1 and the arrival of the Transport Seraphim from over 600 worlds to the Temple of New Life.