Confirming the existence of quark cores inside neutron stars has been one of the most important goals of neutron star physics for the last 40 years. Developments in the study of neutron stars since 1975 are reviewed. ... A neutron star is typically between 1.4 and 4 times as massive as our own Sun, but is squeezed into a volume only about twenty kilometers in diameter, and so has an extremely high density. But it’s not as simple as that. The Nuclear Physics program at the DOE Office of Science funded research that produced supercomputer models of neutron star collisions. For a little under six years, I earned my Ph.D. in theoretical nuclear astrophysics at Kent State University researching the interior of neutron stars and the strange kinds of physics we might find there. Dive into the interior of neutron stars and you’ll find, guess what, neutrons. Neutron stars are the leftover remnants of very large, very old stars that have died in … Topical problems in the physics of and basic facts about neutron stars are reviewed. Use the fact that a Neutron Star has about 1.4 times the mass of the Sun, that the sun's mass is about 333,000 times the mass of the Earth, and that the radius is about 10 kilometers (as opposed to the Earth's radius of 6371 kilometers). One hypothesis is that it’s filled with free quarks, not confined inside neutrons. The COST Action PHAROS (CA16214) has the ambitious goal of attacking key challenges in the physics involved in neutron stars by facing them via an innovative, problem based approach, focussing on current, and new, data and experiments, and that hinges on interdisciplinary Working Groups. https://www.nasa.gov/mission_pages/GLAST/science/neutron_stars.html Attention is given to pion condensation, quark matter, finite-temperature equations of state, neutron-star cooling, and dynamical effects of superfluidity. Neutron Stars If a red giant is between ten and thirty times the mass of the Sun and its core survives a supernova , it ends its life as a neutron star. There’s no shortage of theories as to what might make up the centre of these cosmic objects. Neutron stars are some of the densest manifestations of massive objects in the universe. A neutron star is the core of a red giant which is so compressed through the force of its own gravity that its protons and electrons have been squashed together and have finished up as neutrons* . We can use this classical formula to estimate the gravity on a Neutron Star. The deeper the dive, the fuzzier and denser the interior gets. The Physics of the Universe - Black Holes and Wormholes - Stars, Supernovas and Neutron Stars. The observational manifestations of neutron stars, their core and envelope structure, magnetic fields, thermal evolution, and masses and radii are briefly discussed, along with the underlying microphysics. DOE also supports experiments at DOE's Jefferson Lab that, by measuring the distribution of neutrons in nuclei, tell us about the physics of neutron stars and the properties of dense nuclear matter. 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