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Nature 419, 121-123 (12 September 2002) | doi:10.1038/419121a

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Astronomy: The missing link

Shri Kulkarni

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Some stars might be 'magnetars', powered by magnetism instead of fusion. The discovery of an X-ray burst from an anomalous X-ray pulsar suggests that this type of star can be added to the list.

About 60 years ago, physicists realized that ordinary stars are powered by nuclear fusion. Since then, astronomers have found other types of star that are powered by gravitational binding energy, by radioactivity or by rotational energy.