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Nature 453, xii (19 June 2008) | doi:10.1038/7198xiia; Published online 18 June 2008

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Making the paper: Keivan Stassun

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Astronomers find that identical twin stars are not always the same.

'Identical twin' stars are about as rare as their human counterparts. As the name suggests, these stars are thought to have been born at the same time and been made from the same materials.