white dwarf

n. (Astronomy) small and extremely dense star of high surface temperature and nearly the size of earth (it is produced when a low to medium mass star dies)

A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter. As white dwarfs have mass comparable to the Sun's and their volume is comparable to the Earth's, they are very dense. Their faint luminosity comes from the emission of stored heat. They comprise roughly 6% of all known stars in the solar neighborhood. The unusual faintness of white dwarfs was first recognized in 1910 by Henry Norris Russell, Edward Charles Pickering and Williamina Fleming;, p. 1 the name white dwarf was coined by Willem Luyten in 1922.
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Noun
1. a faint star of enormous density
(synonym) white dwarf star
(hypernym) star

A highly evolved stellar remnant, it is the remains of a stellarcore following the cessation of nuclear fusion.It is composed of electron degenerate material and is often found in planetary nebulae. It can be within a wide range of temperatures between 100,000 and 4,000 Kelvin. White dwarfs have no internal heat sources but instead they gradually radiate their residual energy until they become black dwarfs . White dwarfs are very small, sometimes having a diameter less than that of the Earth . The upper mass limit of a white dwarf is 1.4 solar masses (the Chandrasekhar Limit ). Larger than this and the white dwarf would become a neutron star, composed of baryon degenerate matter. White dwarfs in binary star systems can produce novae and type I supernovae.

Eng: white dwarf
Urdu: (فَلکِیات) کَم دَرَخشاں ۔ زِیادَہ کَثافَت اور شَدید دَرجَہ حَرارت والے چھوٹے سِتاروں میں سے کوئی ایک ۔