Insight

                      A rotating neuron star also known as pulsar( artists view).                                                                                                                                                       A celestial object of very small radius, typically 30Km and very high density, compound predominantly of closed packed neutrons. When any star of mass nearly 10-29 Solar masses start to collapse at the end of their life, in supernova they flushes out all the electrons , protons, neutrinos and many other particles, they remained only with neutrons yielding the name Neutron star. Neutron stars are the smallest and densest stars not counting Black holes , Quark stars , hypothetical White holes and strange stars . They are formed only by those stars whose masses is insufficient to produce a Black hole.                               A neutron star captured by high resolution telescope.                                                                        

Black holes are regions of space where gravity is extreme enough to prevent the escape of even photons( fastest moving particles in universe) . We can't able to see them directly because they don't emit anything except Hawking radiation(not confirmed ,under research) .                                                                                       Recently , scientists find a monster Black hole whose mass is 700 trillion solar masses and it is as luminous as 10,000 Suns . Now,you have a question in your mind how Black hole can shine? In reality, Black hole doesn't shine but it is the disc of gases which revolve around the Black hole and due to friction and high speed rotation it's temperature rises and make Black hole horizon shine.                                                                                       According to the prediction of many scientists a super massive black hole "Sigitarrius A*" is present at the centre of our milky way galax