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A note on stellar collapse. Due to extremes of internal heat the mean density within a star will be lower than other celestial bodies such as planets.
A typical neutron star has a mass between ~1.4 and about 2 solar masses with a surface temperature of ~6 x 105 Kelvin [3][4][5] (see Chandrasekhar limit).[6][a] Neutron stars have overall densities of 3.7×1017 to 5.9×1017 kg/m3 (2.6×1014 to 4.1×1014 times the density of the Sun), which is comparable to the approximate density of an atomic nucleus of 3×1017 kg/m3.[7] The neutron star's density varies from below 1×109 kg/m3 in the crust - increasing with depth - to above 6×1017 or 8×1017 kg/m3 deeper inside (denser than an atomic nucleus).[8] This density is approximately equivalent to the mass of a Boeing 747 compressed to the size of a small grain of sand. A normal-sized matchbox containing neutron star material would have a mass of approximately 5 billion tonnes or ~1 km³ of Earth rock.
Quote from: jeffreyH on 18/09/2014 01:06:52A note on stellar collapse. Due to extremes of internal heat the mean density within a star will be lower than other celestial bodies such as planets. not true. Consider a neutron starQuoteA typical neutron star has a mass between ~1.4 and about 2 solar masses with a surface temperature of ~6 x 105 Kelvin [3][4][5] (see Chandrasekhar limit).[6][a] Neutron stars have overall densities of 3.7×1017 to 5.9×1017 kg/m3 (2.6×1014 to 4.1×1014 times the density of the Sun), which is comparable to the approximate density of an atomic nucleus of 3×1017 kg/m3.[7] The neutron star's density varies from below 1×109 kg/m3 in the crust - increasing with depth - to above 6×1017 or 8×1017 kg/m3 deeper inside (denser than an atomic nucleus).[8] This density is approximately equivalent to the mass of a Boeing 747 compressed to the size of a small grain of sand. A normal-sized matchbox containing neutron star material would have a mass of approximately 5 billion tonnes or ~1 km³ of Earth rock.