You're talking off-world here, so labels like "Mormons" need to be dropped since it's unlikely any Church group but the one on this world have this nickname. The fact is the cosmos is full of people, just like on earth. Celestial glory isn't an exclusive club for "Mormons". But it is an exclusive club reserved only for people who make covenants with the Lord. And the covenant must be ratified by proper priesthood authority. Consider instead that there is a Father who created many worlds, and the sons and daughters living on them are his children (D&C 76). While his children live in their mortal testing period of probation, they are given opportunity to learn the gospel of his son Jesus Christ. If you accept the gospel, you start making covenants with God. A covenant is a two-way binding agreement. You promise to live a certain way, and he promises you will inherit the lifestyle he enjoys. It's available to men and women. Those who make these covenants are called Saints, not Mormons. There were saints in the old days; there are saints in these latter days. They all belong to the Church of Jesus Christ. Anyone can join as long as they are prepared to do what the Savior commands. Part of the deal is that to be like God you need an immortal body. So the mortal one has to go. It gets old or sick or damaged and peels away from the spirit. Later he replaces it with an improved version that never gets tired, sick or dies. This is the resurrection. It's for keeps. If we made and lived up to our covenants, spiritual power will have been nurtured. A strong spirit, immortal body and the keys received through covenants enable a man and wife to "inhabit and share domain" as you put it. But they are not "deceased" since the resurrection gives them eternal life and immortality. They are alive. If a man can grow up to become like his Father, a god, then a woman can develop into a goddess. Some people whose ideas of religion stem from man made churches spawned in the Dark Ages or pre-restoration Reformation period, baulk at this concept. But it has always been taught. The title of becoming a god doesn't mean we demean Father anymore than getting our drivers licenses demeans our earthly parents. He wants us to be like him. He wants us to inherit all that he has. As for our "own planets", Jesus said in his Father's kingdom are many mansions. He told Moses he has created worlds without number. Prophets have also said "as man is now, God once was", suggesting worlds existed before he was a god, and yet more will be created by him and his children as more people progress to be like him. Do I want to become a god? Do I want my wife to become a goddess? Do I want to terraform my own planets? Frankly, I'll be happy to bake a cake without making a mess of things. The future, godhood, other worlds... nice to speculate on, but a bit far off right now. Nevertheless, knowing it's a possibility begs the question: if you believed it was possible, could you really be content achieving anything less?

When a man and women are married in the "temple" and live a faithful life, and they are a part of the "first ressurection", they will recieve their "godhood". The man is a "god" and the women a "goddess". If the man had more than one women "sealed' to him, and this wife makes it's to the first "ressurection, she will be his second "goddess". IF the man is capable and worthy enough, he will be allowed to take more women and make them his "goddesses". Until the ressurection the sealed pairs are not yet full fledged "Gods and Goddesses", they are together in the spirit world, and are still bound to each other, and cannot be separated. All the "God" and "Goddess" stuff happens after the ressurection. Joseph Smith taught that the spirit world is upon this planet, sort of another dimension parallel to the one that is visible to us now. So if there are any Mormons who think "godhood" and Goddesshood" happens right after death , they need to restudy the doctrines of exaltation. So to answer this question, NO.