As many of you know, neutronium is a type of matter found in neutron stars. It is incredibly dense (hundreds of millions of metric tons per cubic centimeter) and consists of neutrons sitting right next to each other. In sci-fi (e.g. star trek) neutronium is sometimes used as nearly indestructible armor. Assuming neutronium armor could be made, how effective would it actually be for protection? IIRC, the force holding neutrons together is far stronger than what holds atoms and molecules together, so on the surface the purported toughness seems reasonable if such armor could be made. But I'd like to be sure. What do you physics experts think?