I've just watched a vid about jets of matter and neutron stars. It was stated in it that a neutron star is a star that's been compressed from say a sun sized star to the size of a city, every thing OK upto now. Then it goes on to say that it has, the neutron star, enormous gravity, this is were I started to think; why is the gravity stronger than the gravity of the original star? The neutron star holds the same amount of matter as the original star so shouldn't the gravity be the same albeit the matter is more compacted. Does the compaction have an effect on the gravity? If so why? Same for a Black hole, in this sense just a more compact neutron star.