Editing Degenerate matter (section)

=== Quark degeneracy ===
{{main|Quark star|Strange star}}
At densities greater than those supported by neutron degeneracy, [[QCD matter|quark-degenerate matter]] 
may occur in the cores of neutron stars,<ref>{{Cite journal|last1=Annala|first1=Eemeli|last2=Gorda|first2=Tyler|last3=Kurkela|first3=Aleksi|last4=Nättilä|first4=Joonas|last5=Vuorinen|first5=Aleksi|date=2020-06-01|title=Evidence for quark-matter cores in massive neutron stars|journal=Nature Physics|language=en|volume=16|issue=9|pages=907–910|doi=10.1038/s41567-020-0914-9 |arxiv=1903.09121|bibcode=2020NatPh..16..907A |issn=1745-2481|doi-access=free}}</ref> depending on the equations of state of neutron-degenerate matter. There is no observational evidence to support this conjecture and theoretical models that predict de-confined quark matter are only valid at masses higher than any observed neutron star.<ref>{{Cite journal |last=Lattimer |first=J. M. |date=2021-09-21 |title=Neutron Stars and the Nuclear Matter Equation of State |url=https://www.annualreviews.org/content/journals/10.1146/annurev-nucl-102419-124827 |journal=Annual Review of Nuclear and Particle Science |language=en |volume=71 |issue= |pages=433–464 |doi=10.1146/annurev-nucl-102419-124827 |bibcode=2021ARNPS..71..433L |issn=0163-8998|doi-access=free }}</ref>{{rp|435}}