The researchers counted 15 gamma rays per minute during the first flare from Markarian 421, 10 times as high as the rate observed from the Crab Nebula, which is a steady source of high-energy gamma ...
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See The Crab Nebula And Cassiopeia - Amazing Time-LapseOver 2 decades of Chandra X-ray Observatory views of the Crab Nebula and Cassiopeia A have been time-lapsed. The Chandra team explains here. Credit: NASA/CXC/A. Hobart ...
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