The discovery of two superluminous supernovae at large distances from Earth pushes the frontier of supernova studies to just 1.5 billion years after the Big Bang, and suggests that they may be common in the young Universe. See Letter p.228
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Notes
*This article and the paper under discussion3 were published online on 31 October 2012.
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Smartt, S. Cosmic explosions in the young Universe. Nature 491, 205–206 (2012). https://doi.org/10.1038/nature11643
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DOI: https://doi.org/10.1038/nature11643