The New Gamma-Ray Astronomy

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Abstract
Our understanding of the gamma‐ray sky is being revolutionized. Seven years ago, gamma‐ray astronomers knew of only a scattering of very bright sources. Now, thanks to two international observatories, the gamma‐ray sky appears to be teeming with variety—unstable sources that change violently on short time scales, steady sources that glow radioactively and others whose nature we barely understand.