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Science 8 October 2004:
Vol. 306. no. 5694, p. 215
DOI: 10.1126/science.306.5694.215
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ASTRONOMY:
Gamma Ray Bursts: New Cosmic Rulers?

Robert Irion

Peak frequencies of energy and total energy are tightly correlated for gamma ray bursts, which some astronomers say could make them "new rulers to measure the universe."

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Science. ISSN 0036-8075 (print), 1095-9203 (online)