The Formation:


Neutron stars are one of the universes most extreme objects, they can have the mass of several of our suns, are the size of a small city and can rotate at speeds of almost 1/3 of the speed of light.  How does this all start?  By a star running out of fuel.

Our sun
  Source(Standard_Sun)
       
        Here we see our sun, with the normal events of most stars occurring such as fusion and emmision of large amounts of radiation.  This is the stage that most of the visible stars we see in the sky are at.  The next stage in stars lives is when the star runs out of it's main source of energy, hydrogen.
         At the center of most stars is a core of plasma, within that core fusion takes place.  Our sun undergoes constant helium fusion, where two helium atoms slam into each other and fuse to form oxygen and carbon (enchanted).  When the star runs out of helium to fuse, a new kind of fusion occurs, where the now formed oxygen and carbon atoms fuse into things like neon, silicon and iron.  However fusion does not occur past iron since it is the last atom to give off energy during fusion. 
        As more and more of the core gets turned into iron from the fusion reactions, less and less fusion energy is pushing out holding the star up.  At some point the star will die and go supernova, leaving behind the mostly iron core which is now collapsing in on itself  and we are left with something like this
Nuetron star
Source (Bowers, Steve)

        This is kind of what a Nuetron star might look like.  Interestingly, these super dense stars are not all that bright, since it has been almost completely collapsed and nothing but iron, neutrons, protons and electrons are left, no nucluer fusion occurs.  This also makes these stars quite hard to find, even with high powered telescopes.

 Source (Starry_Background)

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