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 ...
The Chandra X-Ray Observatory collaborated with X-ray Polarimetry Explorer (IXPE) to capture this image of the crab nebula in April ... discovery (the Compton Gamma Ray Observatory, launched ...
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