Blue Dwarf :- It is theorized to be developed from a red dwarf when it looses most of it's hydrogen supply.We haven't found any blue dwarf because red dwarf fuses their hydrogen slowly and currently the universe might not old enough to produce any blue dwarf.
Black Dwarf :- It is thought to be the come from a white dwarf which has exhausted all it's fuel and heat energy which now no further emits radiation and are very hard to detect, fortunately, it do retain it's mass allowing scientists to study it's the gravitational field.
Black Dwarf :- It is thought to be the come from a white dwarf which has exhausted all it's fuel and heat energy which now no further emits radiation and are very hard to detect, fortunately, it do retain it's mass allowing scientists to study it's the gravitational field.
It is concluded that the time required for a black dwarf to be formed is longer than the age of the universe thus we haven't found it yet.
Frozen star:-There is a probability that this star will form in the distant future when the abundance of heavier metals will be more than it is today which is known as the metallicity of the interstellar medium.
It is calculated the temperature of this star will be 273 K or 0-degree celsius. These stars will belong to the spectral class of 'H'.
Planck star:- It is a hypothetical star that has density equals to the Planck density 9.9 x10^-27 kg per meter cube.
Preon star :- A hypothetical star which is considered to have the core of preons(point particles)
Quasi star :- It is a hypothetical star that might existed at the early stage of the universe that was powered by the black hole at it's center unlike conventional stars that nuclear fusion energy.
Thorne–Żytkow object :- It is predicted that when a red giant or super red giant has a neutron star at it's a star it is theorized as Thorne–Żytkow object. Apparently, HV 2112 is the most probable of this star class type.
Boson star :- A hypothetical star that thought to be made up of bosons like gluons, photons, Z boson etc.
Iron star :- The theory states that fusion occurring in stars will eventually convert light particles into heavy particles and then decay into iron converting all the mass of the star into cold iron balls.
Population III star :- These are the hypothetical stars that existed at the very early stage of the universe after the big bang.
These are the stars that started producing heavier elements at their core and helped made life possible as we know it today
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