Because they formed from this collapse, when they are young, they have a very large rotation speed (spin very quickly!).

Also: They develop extremely strong magnetic fields. These are created due to the fast rotation and because the neutron star is a very, very good magnetic conductor (just like our molten Iron core on Earth).

Neutron stars are made up entirely of neutrons (hence the name!). All the electrons have been crushed into the protons, making neutrons. The individual neutrons are stronger than electrons, and put up a fight against gravity. Thus:

Neutron Stars are supported via NEUTRON DEGENERACY.

For a long time the existence of Neutron stars was speculated. Neutron stars were finally discovered by Jocelyn Bell in 1967.. in the form of Radio Pulsars!!

If we are lucky enough to be in the path of their sweeping (light-house-like) radio emission, then we will see light coming from their magnetic poles: click here to see an animated version..