Astronomy: A gravitational lens observed at very high energies

A collaboration including ETH physicists at the Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) observatory reports the discovery of the most distant gamma-ray source ever observed at very high energies — thanks to the 'replay' of an enormous flare by a galactic gravitational lens, as predicted according to Einstein’s theory of General Relativity.

by Andreas Heinz Trabesinger
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