A Milestone in Understanding Cosmic Forces
For the first time, an international research team has measured the instantaneous power of jets blasting from a black hole, marking a significant breakthrough in our understanding of how these cosmic objects shape galaxies and influence the universe at large. The jet power from the relatively close black hole-star system is equivalent to 10,000 suns, according to findings published Thursday in Nature Astronomy. The team also tracked the jet speed at roughly 355 million mph (540 million kph), or half the speed of light.
This achievement represents the culmination of 18 years of collaborative scientific work—a testament to the value of sustained, international cooperation in advancing human knowledge. The research demonstrates how long-term investment in fundamental science, conducted through global networks and institutions, can yield transformative insights into the workings of our universe.
The System Under Study
The system being studied, Cygnus X-1, is located 7,200 light-years away and features a black hole and a blue supergiant star in constant orbit around one another. A light-year measures nearly 6 trillion miles (9.7 trillion kilometers). The binary system was discovered in the 1960s and is located in the Milky Way's Cygnus, or swan, constellation. The black hole itself holds historical significance—it was the first one ever identified more than a half-century ago.
The University of Oxford's Steve Prabu and his team, working from Australia's Curtin University which led the study, based their findings on 18 years of high-resolution radio imaging obtained by a global telescope network. Prabu and his colleagues measured the swift power of the "dancing jets," as he calls them, as they were pushed in opposite directions by the star's wind. The group based its calculations on how much the jets were bent by the stellar wind as well as computer modeling.
Breaking Through Previous Limitations
Until now, a black hole's jet power had to be averaged over tens of thousands of years, a significant limitation in researchers' ability to understand these dynamic systems. The new measurement capability represents a qualitative leap forward in observational astronomy. Prabu highlighted a key finding: that 10% of all the energy released as matter falls toward the black hole is carried away by the jets.
On the skimpy side as black holes go, the one in Cygnus X-1 is continually pulling gases from its stellar companion as they orbit one another. The supergiant star feeds material to the black hole, giving it "something to 'eat' and launch as jets," Prabu explained.
Implications for Cosmic Understanding
Prabu said the jets can help scientists better understand how black holes help shape galaxies and other cosmic structures through large-scale shocks and turbulence. This research opens pathways for deeper comprehension of how the universe's most powerful objects influence the formation and evolution of galaxies themselves—questions central to astrophysics.
Looking forward, Prabu plans to apply similar techniques to other black holes. "It would be exciting to measure jet power in many more systems," he said, indicating that this breakthrough methodology could accelerate discovery across the field.
Why This Matters:
This achievement underscores the importance of sustained public investment in fundamental science and international scientific collaboration. The 18-year effort required to make these measurements demonstrates that breakthrough discoveries often depend on long-term commitment and resources that individual institutions or commercial entities alone might not prioritize. The research also illustrates how knowledge generated through publicly-funded science—conducted through universities and international networks—expands human understanding of the cosmos in ways that benefit society broadly. As climate change and technological challenges demand scientific solutions, this work reminds us that supporting foundational research through collective, international effort yields discoveries that reshape our understanding of reality itself.