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Cosmic rays enter the "dark" age Eight new sources of very high energy gamma rays have been found in the centre of our galaxy, including two "dark" sources that have never been seen before at other wavelengths. The discovery was made by an international team of astrophysicists who used the HESS array of telescopes in Namibia in Africa to conduct the most sensitive ever survey of the Milky Way at such short wavelengths (F Aharonian et al. 2005 Science 307 1938).
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