Astronomy: Puzzling Pulsars

The more that astronomers learn about pulsars, the still-to-be-identified bodies that are sending strange beeping signals from the Milky Way, the more difficult to identify the pulsars become. Last week, at a Manhattan gathering of the growing group of pulsar specialists, scientists from the Kitt Peak National Observatory in Arizona and the Lick Observatory in California disclosed that Pulsar I not only sends out high-frequency radio signals every 1.3 seconds, but also gives off light flashes just about half as often. The conferees were beginning to ponder this new information when...

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