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Science 24 February 2006:
Vol. 311. no. 5764, pp. 1105 - 1106
DOI: 10.1126/science.1123992
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Perspectives

ASTRONOMY:
Sorting Out the Colors of Globular Clusters

Kenneth C. Freeman

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.

The author is in the Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611 Australia. E-mail: kcf{at}mso.anu.edu.au

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Science. ISSN 0036-8075 (print), 1095-9203 (online)