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Black holes, white dwarfs, and neutron stars Saul A. Teukolsky, Stuart L. Shapiro
Publisher: John Wiley & Sons Inc

While nothing in the universe just evaporates into emptiness, lets stop the process there and say we can call the time of death at these end points: White dwarf, neutron star, and black hole. A star undergoes many radical changes throughout its lifespan including the inevitable exhaustion of its fuel source. One spoonful of a neutron star would weigh about 1 billion tons. An exhausted star will evolve into a neutron star, a black hole or a white dwarf – depending on its mass. The white dwarf-neutron star final remnant consists of a cold neutron star core with a hot mantle on top. As the population of stars ages, it will consist either of the dead corpses of previous generations—dim objects such as white dwarfs or neutron stars and black holes—or of slowly evolving, faint, low-mass stars. In between black holes and white dwarfs are objects called neutron stars. Sources of detectable gravitational waves could possibly include binary star systems composed of white dwarfs, neutron stars, or black holes. The Royal Astronomical Society that suggest that two "compact stellar remnants" - which could be neutron stars, black holes or white dwarfs - collided and merged, resulting in a short-duration gamma-ray burst that hit Earth. They are much more dense than white dwarfs.