For decades cosmologists assumed black hole jets carried away 10 percent of infalling energy — and now an 18-year stare at Cygnus X-1 finally confirms the guess was right

AI Briefing

• – Scientists confirm black hole jets carry away 10% of infalling energy after 18-year study of Cygnus X-1.
• – Measurements show jets stream at energy equivalent of 10,000 suns and near half the speed of light.
• – Confirmation settles a question that has puzzled black hole physics for decades.