A pulsar that has 'escaped' from the supernova remnant where it was born is helping astronomers redefine their understanding of pulsar ages. It appears that many apparently young pulsars are in fact older than they seem.
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Seiradakis, J. Older than they look. Nature 406, 139–140 (2000). https://doi.org/10.1038/35018198
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DOI: https://doi.org/10.1038/35018198