neutronium
Pure nuclear matter
Neutronium is a hypothetical substance composed entirely of neutrons, packed together at extreme density.
The term appears in astrophysics to describe the theoretical material in neutron star cores, and in science fiction as an impossibly dense, often indestructible substance: The hull was made of neutronium.
In reality, neutrons cannot remain stable outside atomic nuclei under normal conditions.
Proton or neutron
- baryonThree-quark composite particle
- fermionHalf-integer spin particle
- hadronQuark-containing subatomic particle
- quarkFundamental matter particle
gluon · isotope · nucleosynthesis · strong force · atomic nucleus · mass number · beta decay
Magnetized rotating neutron emitter
- gravitational collapseInward fall from gravity
- white dwarfExhausted star's compact corpse
- black holeCollapsed star's remnant
- supernovaExploding massive star
Impossible-to-acquire fictional substance
- adamantiumFictional unbreakable metal
- indestructibleImpossible to damage permanently
- Death StarFictional world-destroying space station
- imperviousUnable to be affected
force field · warp core · superweapon · space opera · comic book · Star Trek · science fiction · technobabble
Abnormally high density
- superdenseExtraordinarily high mass-to-volume ratio
- incompressibleCannot be made smaller
- exotic matterSubstance violating standard physics
- gravitationalRelating to mass-based attraction
nucleon
Proton or neutron
- baryonThree-quark composite particle
- fermionHalf-integer spin particle
- hadronQuark-containing subatomic particle
quark · gluon · isotope · nucleosynthesis · strong force · atomic nucleus · mass number · beta decay
pulsar
Magnetized rotating neutron emitter
- gravitational collapseInward fall from gravity
- white dwarfExhausted star's compact corpse
- black holeCollapsed star's remnant
unobtainium
Impossible-to-acquire fictional substance
- adamantiumFictional unbreakable metal
- indestructibleImpossible to damage permanently
- Death StarFictional world-destroying space station
impervious · force field · warp core · superweapon · space opera · comic book · Star Trek · science fiction · technobabble
hyperdense
Abnormally high density
- superdenseExtraordinarily high mass-to-volume ratio
- incompressibleCannot be made smaller
- exotic matterSubstance violating standard physics
neutron, neutrons, deuterium, antineutron, neutron star, antineutrino, antineutrons