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Comparison of a 10 km radius neutron star (top left corner) and a 6000 km radius white dwarf, the latter roughly the size of Earth. Neutron stars have overall densities of 3.7 × 10 17 to 5.9 × 10 17 kg/m 3 (2.6 × 10 14 to 4.1 × 10 14 times the density of the Sun), [a] which is comparable to the approximate density of an atomic nucleus of 3 ...
These lists contain the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects.
An exoplanet orbits PSR B1620-26 and its white dwarf companion (see below) in a circumbinary orbit. HD 49798: 1,600 White dwarf: One of the smallest white dwarf stars known. [14] ZTF J1901+1458: 1,809 Currently the most massive white dwarf known. [15] Janus: 3,400 A white dwarf with a side of hydrogen and another side of helium. [16] Wolf 1130 ...
English: A visual comparison of a white dwarf with a radius of 6000 km (roughly the Earth's radius) and a neutron star. With radius of just 10 km, the neutron star is a dot compared to white dwarf, yet it is more massive and hence much more dense.
Old neutron stars are relatively small and cold, and would fall on the far right side of the diagram. Planetary nebulae are dynamic and tend to quickly fade in brightness as the progenitor star transitions to the white dwarf branch. If shown, a planetary nebula would be plotted to the right of the diagram's upper right quadrant.
The Crab Nebula is a supernova remnant containing the Crab Pulsar, a neutron star. In certain binary stars containing a white dwarf, mass is transferred from the companion star onto the white dwarf, eventually pushing it over the Chandrasekhar limit. Electrons react with protons to form neutrons and thus no longer supply the necessary pressure ...
The surface gravity of a white dwarf is very high, and of a neutron star even higher. A white dwarf's surface gravity is around 100,000 g (10 6 m/s 2) whilst the neutron star's compactness gives it a surface gravity of up to 7 × 10 12 m/s 2 with typical values of order 10 12 m/s 2 (that is more than 10 11 times that of Earth).
The metal-rich white dwarf WD 1145+017 is the first white dwarf observed with a disintegrating minor planet that transits the star. [ 177 ] [ 178 ] The disintegration of the planetesimal generates a debris cloud that passes in front of the star every 4.5 hours, causing a 5-minute-long fade in the star's optical brightness. [ 178 ]