JWST Discovers a "Black Hole Star" From the Dawn of the Universe

660 million years after the Big Bang, something was shining far too brightly to be a star. A team led by astronomer Rohan Naidu has now identified what it was: a black hole roughly 100,000 times the mass of the Sun, cocooned inside a dense shell of hydrogen about the size of our solar system. Published in Nature on August 13, the discovery could resolve one of the biggest open questions of the JWST era.

The "little red dots" problem

Since the James Webb Space Telescope began full science operations in 2022, it has been finding compact, bright red objects in the early universe that do not match any known category. Astronomers have been calling them "little red dots." Some are too luminous to be normal galaxies at that distance. Others have spectra that defy standard classification. The debate over what they actually are has become one of the most active in astrophysics.

Naidu's team thinks at least some of them are black hole stars. The object they studied is not powered by nuclear fusion. Instead, gas falling into the black hole generates enough friction and heat to make the surrounding hydrogen shell glow. From a distance, it looks stellar. Up close, the physics is completely different.

Why this matters for black hole formation

Current models struggle to explain how supermassive black holes got so massive so quickly in the early universe. The standard path involves a star collapsing into a small black hole that slowly accretes mass over billions of years. But JWST keeps finding enormous black holes at cosmic dawn, far earlier than that timeline allows.

A 100,000 solar mass black hole wrapped in a hydrogen cocoon at 660 million years after the Big Bang suggests a much faster growth mechanism. If this object is representative of a broader population, the seeds of today's supermassive black holes were planted far earlier and grew far faster than anyone had modelled.

What comes next

The team is now looking at other "little red dot" candidates to see how many fit the black hole star profile. If the answer is "most of them," it rewrites the early chapters of how galaxies formed. JWST's infrared instruments are the only tools currently capable of detecting these objects at this distance, so the telescope's observation queue for the next cycle will likely prioritise follow-up work. If you are curious about other recent breakthroughs in fundamental physics, we covered how scientists proved sunlight can create quantum entanglement earlier this month. JWST is also not the only telescope making unexpected finds: the ALMA array recently captured a gas stream in a triple star system that challenged its own set of assumptions.