Earth compared to a white dwarf

Earth compared to a white dwarf

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Caption: Image comparing the size of Earth (right) with a typical white dwarf star such as Sirius B. A white dwarf is the final stage in the evolution of most stars - and indeed the Sun will one day become a white dwarf itself. A star with a mass less than 1.4 times that of our Sun is thought, after it has used all its nuclear fuel, to form a white dwarf. Its outer layers escape into space, leaving the core behind as a white dwarf. These exotic objects are very, very dense, the mass of a star compressed into a sphere the size of a planet, dozens or even a hundred times smaller.

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Keywords: astronomy, comparison, earth, planet, size, space, white dwarf

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