Dying supergiant stars implicated in hours-long gamma-ray bursts
The blasts emit surges of gamma rays as well as X-rays, and they produce afterglows that are visible at optical and radio energies. By NASA’s Goddard Space Flight Center, Greenbelt, Maryland — Published: April 17, 2013 Three unusually long-lasting stellar explosions discovered by NASA’s Swift satellite represent a previously unrecognized class of gamma-ray bursts (GRBs). …
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