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Observational Astronomy

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XL-Calibur Balloon Measures Hard X-Ray Polarization of Cygnus X-1 With Record Precision

The newly published measurements tighten constraints on how high-energy radiation forms near the black hole.

LHAASO Links Cosmic-Ray 'Knee' to Black Hole Micro-Quasars

Ground Telescopes Capture Polarized Microwave Light From Cosmic Dawn