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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. 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. T

What is a nova? A nova in deep space is a sudden bright flash that varies from some seconds to several years. The novas are often so bright that sometimes they are thought to be the new star is forming up which isn't the case.  All the novas which are observed so far involves a binary star system in which one of a star is a white dwarf and another is any star from the sequence of stars. Novae are mainly seen along the pathway of the milky way galaxy in the constellation of Sagittarius. Illustration of a white dwarf eating it's star The novas are divided into three broad categories:-  1.) Classical nova These are the most often seen type of nova. This happens when the orbital period of both the stars falls short and the white dwarf is close enough to the companion star then the white dwarf starts drawing matter from the companion star onto the surface of itself which forms a dense but low height envelop of gases mainly consisting of hydrogen.  When hydrogen gas i

What is an aurora? Aurora Borealis or northern lights is one of the most beautiful phenomena that nature has given us. It is a natural light display in the night sky. It is mainly observed in the high latitude areas.  It is an impressive and fascinating demonstration of how the very fast-moving charged particles interact with the atmosphere of the earth due to the magnetic field of the earth. It worth bearing the cold outside to experience this unforgettable and soothing scene. It makes you feel connected to nature and the divine. People have often confusion between aurora borealis and aurora australis but there is no difference between except for their location when the lights are observed in north pole then it is called as aurora borealis( or northern lights) and when seen at the south pole it is called as aurora borealis(or southern lights). Illustration of aurora formation What causes this amazing and magical phenom enon?   Our sun is a giant ball of gas which

Theoretical scientific explorations of the end of the universe were made possible by the general relativity given by the  Albert Einstein in 1915. here are many possibles outcomes of the theory it defines the universe at the largest structure possible.  Alexander Friedmann came up with many solutions in 1922 and Georges Lemaitre in 1927. one of them suggests that the universe is expanding since the birth of the universe To determine the ultimate fate of the universe the scientists need to gather the data regarding the  critical density of the universe  (the age density of matter required by the universe to stop the expansion).  If in the case the density found to be lower than the critical density then the universe will continue to expand forever, if the density found to be equal to the critical density then the universe expands forever but will decrease it's the of expansion gradually and if the density found is more than the critical density the universe will stop expanding