Astronomers measure the mind-blowing power and speed of black hole jets for the first time

Astronomers measured the instantaneous power and speed of jets from the Cygnus X-1 black hole for the first time, finding they release energy equivalent to 10,000 suns and travel at 355 million mph. The study, led by Steve Prabu, used 18 years of radio imaging to analyze the black hole's interaction with its companion star.