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Black Holes in a radar trap European astronomers succeeded for the first time to confirm the signatures predicted near Black Holes by Albert Einstein's theory of Relativity in the light of the cosmic X-ray background. The group of scientists led by Günther Hasinger, director at the Max-Planck-Institute for extraterrestrial Physics in Garching near Munich could identify the spectral fingerprint of iron atoms. They observed a strong, relativistically smeared iron line in the average spectrum of roughly 100 active galaxies, whose X-ray light had been emitted when the Universe was less than half of its current age (Astronomy Astrophysics, vol. 432(2), March 2005).
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