Earth-size 'diamond' in space: Remarkable white dwarf star possibly coldest, dimmest ever detected

Astronomers have identified possibly the coldest, faintest white dwarf star ever detected. This ancient stellar remnant is so cool that its carbon has crystallized, forming -- in effect -- an Earth-size diamond in space. The object in this new study is likely the same age as the Milky Way, approximately 11 billion years old.

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