1) Fictional material
Found on
https://www.crosswordclues.com/clue/neutronium
Neutronium (sometimes shortened to neutrium) is a proposed name for a substance composed purely of neutrons. The word was coined by scientist Andreas von Antropoff in 1926 (before the discovery of the neutron) for the conjectured `element of atomic number zero` that he placed at the head of the periodic table. However, the meaning of the term ha.....
Found on
http://en.wikipedia.org/wiki/Neutronium
The densest possible kind of matter outside of a black hole; the term is a somewhat informal one but applies to a genuine scientific concept. Neutronium, of which neutron stars are composed, consists primarily of neutrons packed closely together. In this state, the neutrons repel each by degenerate ...
Found on
http://www.daviddarling.info/encyclopedia/N/neutronium.html
No exact match found.
