'Fingerprints' of black hole's event horizon detected for first time

'Fingerprints' of black hole's event horizon detected for first time Phys.org GW250114 reveals signatures of post-merger black-hole horizon Nature Scientists May Have Detected The First Signature of a Black Hole's Event Horizon ScienceAlert A ‘direct wave’ from colliding black holes reveals signature of a whirlpool in spacetime The Conversation Researchers detect “frame dragging” around merging black holes | Newswise Newswise