Sending out bursts of radio waves up to 600 times a second, millisecond pulsars have intrigued astronomers since a discovery four years ago that some reside at the heart of dense amalgams of Milky Way stars. These cosmic lighthouses offer clues to the evoluation of globular clusters, ancient star groupsings that rank among the oldest objects of our galaxy.

Until recently, scientists had identified only 13 millisecond pulsars distributed among 12 globular clusters. In the July 18 NATURE, an international team of astronomers has announced it discovered 10 more of ...

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