Greetings Mara!! The heavenly abodes of intentional design and construction are the progressive destinations of our Paradise journey. The grandeur and beauty of the evolutionary worlds can only hint at what awaits us on the architectural spheres ahead!
We are told we may miss snow and wind and seasons and tides but will experience such beauty as to satisfy, even astound the senses!
It is my understanding that there are two types of worlds in the universes of time and space: evolutionary material worlds and architectural worlds, each with very different forms, origins, and functions.
Urantia is an evolutionary material world formed by the material forces of physics. The Mansion Worlds are an example of constructed spheres formed by celestials of morontial materials.
15:5.13 (172.1) 10. Architectural Worlds. These are the worlds which are built according to plans and specifications for some special purpose, such as Salvington, the headquarters of your local universe, and Uversa, the seat of government of our superuniverse.
15:6.1 (172.3) Irrespective of origin, the various spheres of space are classifiable into the following major divisions:
15:6.2 (172.4) 1. The suns—the stars of space.
15:6.3 (172.5) 2. The dark islands of space.
15:6.4 (172.6) 3. Minor space bodies—comets, meteors, and planetesimals.
15:6.5 (172.7) 4. The planets, including the inhabited worlds.
15:6.6 (172.8) 5. Architectural spheres—worlds made to order.
15:6.7 (172.9) With the exception of the architectural spheres, all space bodies have had an evolutionary origin, evolutionary in the sense that they have not been brought into being by fiat of Deity, evolutionary in the sense that the creative acts of God have unfolded by a time-space technique through the operation of many of the created and eventuated intelligences of Deity.
15:7.3 (174.3) The headquarters worlds of the seven superuniverses partake of the nature and grandeur of Paradise, their central pattern of perfection. In reality, all headquarters worlds are paradisiacal. They are indeed heavenly abodes, and they increase in material size, morontia beauty, and spirit glory from Jerusem to the central Isle. And all the satellites of these headquarters worlds are also architectural spheres.
15:7.4 (174.4) The various headquarters worlds are provided with every phase of material and spiritual creation. All kinds of material, morontial, and spiritual beings are at home on these rendezvous worlds of the universes. As mortal creatures ascend the universe, passing from the material to the spiritual realms, they never lose their appreciation for, and enjoyment of, their former levels of existence.
15:7.5 (174.5) 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.
15:7.6 (174.6) Edentia, the headquarters of your constellation of Norlatiadek, has its seventy satellites of socializing culture and training, on which ascenders sojourn upon the completion of the Jerusem regime of personality mobilization, unification, and realization.
15:7.7 (174.7) Salvington, the capital of Nebadon, your local universe, is surrounded by ten university clusters of forty-nine spheres each. Hereon is man spiritualized following his constellation socialization.
15:7.8 (174.8) Uminor the third, the headquarters of your minor sector, Ensa, is surrounded by the seven spheres of the higher physical studies of the ascendant life.
15:7.9 (174.9) Umajor the fifth, the headquarters of your major sector, Splandon, is surrounded by the seventy spheres of the advancing intellectual training of the superuniverse.
15:7.10 (175.1) Uversa, the headquarters of Orvonton, your superuniverse, is immediately surrounded by the seven higher universities of advanced spiritual training for ascending will creatures. Each of these seven clusters of wonder spheres consists of seventy specialized worlds containing thousands upon thousands of replete institutions and organizations devoted to universe training and spirit culture wherein the pilgrims of time are re-educated and re-examined preparatory to their long flight to Havona. The arriving pilgrims of time are always received on these associated worlds, but the departing graduates are always dispatched for Havona direct from the shores of Uversa.
15:7.11 (175.2) Uversa is the spiritual and administrative headquarters for approximately one trillion inhabited or inhabitable worlds. The glory, grandeur, and perfection of the Orvonton capital surpass any of the wonders of the time-space creations.
15:7.12 (175.3) If all the projected local universes and their component parts were established, there would be slightly less than five hundred billion architectural worlds in the seven superuniverses.
"Live loyally today—grow—and tomorrow will attend to itself. The quickest way for a tadpole to become a frog is to live loyally each moment as a tadpole."