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XL-Calibur

Balloon-launched telescope observations reveal how material falls into the black hole in Cygnus X-1

Avi Blizovsky
December 4, 2025
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A team of researchers used the balloon-borne XL-Calibur telescope to measure polarized X-rays from the black hole Cygnus X-1 in unprecedented detail, revealing new clues about how hot material twists and turns.