Have you ever thought or heard of anobject that contains the mass of sun? And the size of such an object is nearlya size of a city? Yes, such objects occur in the universe. They are called asneutron stars. There are nearly 10 types of neutron stars they are neutron stars, black dwarfs, whitedwarfs, brown dwarfs, red dwarfs, yellow dwarfs, blue giants, red giants, bluesupergiants and red supergiants.

And an interesting fact aboutneutron star is that a single teaspoonof it weighs a billion tons, indicating that they are so dense. Theirspinning rate is 43,000 times per minute. Diameter of neutron stars is 20-kilometers.Whatare they?Neutron stars are formed when giantstars die in supernovas.  Generally Supernovasare of two types, one occurs at the binary star system and the other occurs atthe end of the single stars lifetime. As the star runs out of fuel some of themass of the star starts to move towards the centre (towards the core). During  this time the core becomes too heavy and thestar cannot withstand its own gravitational force. So the star starts tocollapse with electrons and protons which melt to form neutrons and they arecalled neutron stars.

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Gravity in earth is 2 billion times lesser than thegravity on the neutron star. They transfer material in the form of stellarwinds, they move along the magnetic poles causing X-Ray pulsations as it isheated. Sometimes the materials move with thespeed of light.Typesof neutron stars:                Low-mass X-ray binaries (LMXB).Intermediate-mass X-ray binaries (IMXB). High-mass X-ray binaries (HMXB).

Common known types are pulsars and magnetars.  Pulsars:                 Pulsarsare spinning  neutron stars which emit anarrow beam of radiation. The beam may sometimes sweep across the earth makingthe astronomers to think it as the flashing object. All pulsars are neutronstars but not all neutron stars are pulsars.Magneticmonster (Magnetar):                Magnetarsare the type of neutron stars that have high magnetic field. One of the knownmagnetar is SGR 0525-66.

SGR 0525-66 is locatedabout 163,000 light-years from Earth and  first found (in 1979). Black holes Vs neutron stars:             Both black holes and neutron holes are the same; theyare the product of dying stars. The difference lies in the mass of the parentstar. If a star with a mass 1.4 to 3 times than that of sun dies a neutron staris formed.

If a star with a mass greater than thrice the sun’s mass dies ablack hole is formed.          If two neutron stars collide there isa possibility that a black hole may be formed.  In a neutron star, electrons and protonscombine to form neutrons, and neutrons have no space left to move around.          In a black hole, gravity dominatesand so there is nothing left to halt further collapse. A black hole is thoughtto be a point source, as all the mass resides within a space of zero curvature.The size of a black hole is thus defined by the Schwarzschild radius i.

e., theradius beyond which the escape velocity exceeds the speed of light, called the.         Our universe, still have many interestingthings that are discovered and which are yet to be discovered. 


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