Don't We Already Know Everything About Polaris?

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Science  15 Sep 2000:
Vol. 289, Issue 5486, pp. 1888-1889
DOI: 10.1126/science.289.5486.1888

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Recent results on Polaris and other Cepheids, variable stars used as a yardstick for astronomical distances, illustrate some of the new capabilities we have for studying this important class of stars. In her Perspective, Evans charts some of the recent work and highlights some of the surprises that have been revealed, even in objects thought to be basically understood.