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At the end of its life, our Sun could end up as a crystal—and physicists now have observational evidence to back up that theory. Scientists have predicted that as white dwarfs cool, they can crystallize in a phase transition somewhat like water freezing into ice. New research from scientists in the UK, U.S., and Canada provides evidence of this transition in a survey of nearby white dwarfs. This is especially interesting to us because, as we’ve reported, scientists predict that our own Sun’s fate is to become a white dwarf. White dwarfs are small, faint, and