Neutronium

Neutronium is the super-dense matter that forms in the core of neutron stars, where the pressure is so high that the normal atomic structure of matter breaks down and condenses. Neutronium is occasionally found as an exotic building material in science fiction.

Science Fiction Examples

• In TOS "The Doomsday Machine", Spock described the hull of the alien planet destroyer as "composed of solid neutronium", which was essentially impervious to the Enterprise's phasers.
• Non-movie sources cite neutronium as one of the components of hull armor for Imperial Star Destroyers in Star Wars.
• In Stargate, Neutronium is the basis of Asgard technology and used in the creation of humanform replicators.