Top 10 Hypothetical Space Objects

While it currently doesn't exist in the structure of our universe, Iron Stars are made only when protons are unable to deteriorate; speculated these type of stars undergo a process that only works through quantum tunnelling, which then fuses ordinary matter into iron-56 nuclei, then into iron via fission. They potentially will occur in the very far future scaling enormous amounts of time; they start appearing in approximately in around 10^1000 to 10^2000+ years in the universe within these time periods, which is heavily unlikely to but a possibility.

In the basics, a white hole functions almost exactly like the black hole sucking matter and light, but the difference is matter & energy are expelled from the white hole, therefore it is impossible to enter a white hole due to overwhelming amounts of energy being released from white holes. It's speculated that white holes might exist in the universe but currently there's no consistent evidence to back it up; although there is one candidate, which is the GRB 060614 detected back in June 2006, and was thought to be theorized being a real white hole (GRB is an abbreviation standing for "gamma ray burst").

These types of stars are raised into such massive scales larger than the known largest stars of the universe. Speculated they might have formed at some time in the earlier stages of the universe, mostly forming via collapsing of a star on its earlier stages, therefore forming a black hole continuing the production of energy equal to its gravity forces; unlike nuclear fusion, quasi stars contain and are powered by black holes. Its diameter size can reach up to over 7,000+ times larger than that of the sun (from scales about 10+ billion of kms) and consists of thousand(s) of solar masses. Black hole stars is another name for Quasi Stars. In the current age of the universe, they are unable to form due to changes of helium & hydrogen via terms of elements.

A famous hypothetical planet approximately the size of Neptune and with orbits far exceeding Pluto taking over 10+ millenniums in order to do a full orbit in earth year terms. Currently, astronomers are still searching for the planet. Yet, even with powerful telescopes, surveys & other equipment, there is still no observation that suggests the planet exists; still remaining a theory. Planet Nine is suggested to be 10 times more massive than earth and may be twice or more large as earth in radius terms. It is also suggested that this hypothetical planet might be the cause of unusual orbits of various objects residing in the outer regions of the solar system.

Since the universe is young in age, blue dwarfs can't be formed yet. Blue dwarfs are thought to be a part of the stage of red dwarves. Since stars are known for emitting more light and energy faster as they age, therefore evolving to giants due to increase in scale. Instead, a red dwarf with at least one fourth or lesser of solar mass is said to increase surface temperatures hotter to the point that the color of the star appears blue. No red dwarf has their entire hydrogen stores depleted since red dwarfs consume hydrogen at a slow rate; therefore mentioned above, the universe is too young enough for blue dwarfs to exist.