Answer :

white dwarfs are hot, compact stars whose mass is comparable to the sun's and size to the earth's.

A star core remnant known as a white dwarf is primarily made up of electron-degenerate materials. A white dwarf is extremely dense, with a mass similar to that of the Sun and a volume similar to that of the Earth. White dwarfs do not undergo fusion, thus their feeble light is caused by the emission of leftover thermal energy. Sirius B, the smaller half of the Sirius binary star and the closest white dwarf to Earth, is 8.6 light years away. Among the 100 star systems closest to the Sun, eight white dwarfs are currently believed to exist.

According to theory, white dwarfs are the ultimate form that stars can take before becoming a neutron star or black hole. Over 97% of the other stars in the Milky Way are included in this. [4]:  A main-sequence star of low or medium mass will develop to become a red giant during which time it will fuse helium to carbon and oxygen in its core by the triple-alpha process once the hydrogen-fusing era has ended.

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