JWST Detects Luminous ‘Black Hole Star’ Concealed in Early Universe Gas

Astronomers analyzing data from NASA’s James Webb Space Telescope have proposed the existence of a “black hole star,” a novel astronomical object featuring a supermassive black hole buried within a massive shroud of gas. Spanning an area comparable to the solar system, the celestial body outputs more energy than any conventional star ever observed. The ancient, intensely luminous red object dates back to the early universe, where its unprecedented physical traits suggest an extreme compact engine encased in an expansive gaseous envelope.

“Our picture of this object is evolving very rapidly,” says lead author Rohan Naidu, a NASA Hubble Fellow and Pappalardo Fellow at MIT’s Kavli Institute for Astrophysics and Space Research. “We think there is a central black hole that is 100,000 times as massive as the Sun. And around this black hole, there would be this very extended envelope of gas that looks like a star the size of the solar system. It’s huge.”

Detailed in the journal Nature, the discovery emerged from an observational initiative known as the Mirage or Miracle, or MoM, survey. Utilizing the telescope to identify galaxies formed only a few hundred million years following the Big Bang, the research team was actively scanning deep space when it detected the atypical red source.

At first glance, its red color suggested that interstellar dust might be obscuring and reddening its light. However, its spectrum did not match that explanation. Researchers instead detected a sharp drop in emission at shorter wavelengths, a spectral feature known as a Balmer break.

Balmer breaks typically occur when dense gas absorbs photons within stellar atmospheres and can be observed in stars such as Vega. In this source, however, the break proved significantly stronger than anything astronomers have recorded in ordinary stars.

Naidu said the object displayed the strongest Balmer break the team has ever observed, making an ordinary star an unlikely explanation. The finding instead raised the possibility that researchers are seeing a vastly enlarged version of a stellar atmosphere, he added.

The light also showed little evidence of elements heavier than hydrogen and helium. That composition, combined with the source’s unusual spectrum and extreme brightness, set it apart from typical stars and galaxies.

“It was truly singular in so many ways,” Naidu says.

The object may also help explain a broader mystery emerging from JWST data: the many small, red sources seen in the early universe. Often called “little red dots,” these objects appear in deep-space images but seem to have largely vanished by the present day.

“These little red dots seem to be everywhere in the early universe but essentially disappear by the present day,” Naidu says. “What exactly these objects are has been one of the most debated topics of the JWST era.”

The MoM survey was created partly to examine whether some apparently bright early galaxies are not galaxies at all.

Naidu said astronomers have been trying to explain why so many apparently bright galaxies appear so early in the universe’s history. The team’s work suggests that at least some may not be galaxies at all, but objects that merely resemble them in telescope data.

This finding addresses a central dilemma in modern astronomy known as the “impossible early galaxy” problem. Standard cosmological models predict that massive galaxies require long periods to build stellar mass, yet early telescope observations revealed unexpectedly bright structures less than 500 million years after the Big Bang. Identifying these luminous sources as individual gas-wrapped black holes rather than full galaxies resolves a key tension in how structures grew in the early cosmos.

MIT’s Robert Simcoe and Wendy Sun contributed to the research as study co-authors, working alongside collaborators from other institutions whose joint work continues to clarify observational phenomena from the early universe.