The answer is blowing in the wind

Yousaf M. Butt
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Yousaf M. Butt: Yousaf M. Butt is at the National Centre for Physics, Quaid-i-Azam University, Islamabad, Pakistan and at the Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA. ybutt@cfa.harvard.edu

Nature, 2007, vol. 446, issue 7139, 986-987

Abstract: A source of astoundingly energetic γ-rays associated with a star cluster might provide a clue to a century-old question: where do the cosmic rays that constantly bombard Earth come from?

Date: 2007
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DOI: 10.1038/446986a

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