PerspectiveAstronomy

Sorting Out the Colors of Globular Clusters

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Science  24 Feb 2006:
Vol. 311, Issue 5764, pp. 1105-1106
DOI: 10.1126/science.1123992

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Summary

The colors of the stars in globular clusters fall into two groups. Originally thought to result from stars with different ages, the colors can now be explained by the stars' composition.