Neutron Star

You may be wondering why you can no longer see your star. This is because your star 
has become a neutron star. Neutron stars are formed after the center of a star collapses 
and becomes extremely small, up to 20 km in diameter! At this point, they are too dense 
and can no longer be pusehd closer together. Most of the star is made up of a gas that is 
composed mostly of neutrons, small particles within the nucleus of an atom. The reason 
you cannot see your star is because it is too small to be seen in visible light.