2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4068A review of current neutron star masses and radius measurements is given and the resulting constraints on modern equation of states for nuclear matter. Phase transitions in particular to quark matter is discussed and the novel color superconducting mixed phases.14 pages. Revised versionAstrophysicsNuclear Theorytext