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A white dwarf, then, packs mass comparable to the Sun's into a volume that is typically a million times smaller than the Sun's; the average density of matter in a white dwarf must therefore be, very roughly, 1 000 000 times greater than the average density of the Sun, or approximately 10 6 g/cm 3, or 1 tonne per cubic centimetre. [1]
Its diameter is about ... and become a dense type of cooling star (a white dwarf), ... to calculate the average Earth–Sun distance as 93,726,900 miles ...
The closest encounter to the Sun so far predicted is the low-mass orange dwarf star Gliese 710 / HIP 89825 with roughly 60% the mass of the Sun. [4] It is currently predicted to pass 0.1696 ± 0.0065 ly (10 635 ± 500 au) from the Sun in 1.290 ± 0.04 million years from the present, close enough to significantly disturb the Solar System's Oort ...
The researchers estimated that the white dwarf is orbiting the black hole at about 5% the distance that separates Earth from the sun, or a bit under 5 million miles (8 million km).
A light year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). Like all white dwarfs, it is incredibly dense, packing about 70% of the sun's mass into an Earth-sized ...
Like other white dwarfs, it is a very dense star: its mass has been estimated to be about 67% of the Sun's, [28] yet it has only 1% of the Sun's radius (1.23 times the Earth's radius). [ 7 ] [ a ] The outer atmosphere has a temperature of approximately 6,110 K , [ 28 ] which is relatively cool for a white dwarf.
WD 1337+705 (G238-44) is a star in the constellation Ursa Minor.Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun. [2] It is 86.5 light-years distant from Earth. [1]
Sirius is a binary star system consisting of two white stars orbiting each other with a separation of about 20 AU [e] (roughly the distance between the Sun and Uranus) and a period of 50.1 years. The brighter component, termed Sirius A, is a main-sequence star of spectral type early A , with an estimated surface temperature of 9,940 K . [ 14 ]
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