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Science 3 January 2003:
Vol. 299. no. 5603, pp. 63 - 64
DOI: 10.1126/science.299.5603.63
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Outside Sources Frame a Galactic Puzzle

Govert Schilling

The Milky Way doesn't have a monopoly on globular clusters. Powerful new telescopes have brought other galaxies' clusters into astronomers' view and into the thick of their efforts to fathom the origin of a familiar but mysterious type of galaxy: elliptical galaxies, common astronomical objects so enigmatic that astronomers aren't sure whether they are much older than our Milky Way galaxy or much younger.

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