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Quantum gravity

An astrophysical constraint

A quantum theory of gravity is proving elusive. Observations of radiation from the Crab nebula now place even stronger constraints on the likelihood of detecting the effects of quantum gravity.

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Figure 1: The Crab nebula. Located in the constellation of Taurus, this cloud of gas is all that remains of a star whose explosion in ad 1054 was recorded by Chinese astronomers.



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Correspondence to Sean Carroll.

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Carroll, S. An astrophysical constraint. Nature 424, 1007–1008 (2003).

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