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Triple Star Systems May Do Crazy Eights

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Science  17 Mar 2000:
Vol. 287, Issue 5460, pp. 1910-1912
DOI: 10.1126/science.287.5460.1910b

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Mathematicians have proved that three stars can chase each other forever in a figure-eight pattern, with each one passing between the other two in turn--and that this orbit is stable. Moreover, they unexpectedly found that the three stars do not have to have equal masses, as they had assumed, meaning that the configuration could conceivably be observed in the universe.