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Nature 440, 505-507 (23 March 2006) | doi:10.1038/nature04558;

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A non-spherical core in the explosion of supernova SN 2004dj

An important and perhaps critical clue to the mechanism driving the explosion of massive stars as supernovae is provided by the accumulating evidence for asymmetry in the explosion. Indirect evidence comes from high pulsar velocities, associations of supernovae with long-soft γ-ray bursts, and asymmetries in late-time emission-line profiles.

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