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Nature 455, 177-178 (11 September 2008) | doi:10.1038/455177a; Published online 10 September 2008

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Gamma-ray bursts: Light on the distant Universe

Jonathan Grindlay1

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Observations of a long-lasting gamma-ray burst, one that has the brightest optical counterpart yet discovered, challenge theoretical understanding of these bursts but may enhance their usefulness as cosmic probes.

On a clear night, from one of Earth's increasingly rare dark sites, one can see roughly 3,000 stars with the naked eye. All of these point sources of light are stars within our Milky Way galaxy, and most are closer than about 1,500 light years.

  1. Jonathan Grindlay is at the Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.
    Email: josh@head.cfa.harvard.edu

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