The James Webb Space Telescope has produced two independent findings in nine days that jointly force a rethinking of how supermassive black holes come into existence — and when. One paper, published May 27 in Nature, presents the first direct, dynamical measurement of a black hole mass in the universe's first billion years and shows it outweighs every star in its host object combined. A second, published June 4 in Science, extends a mass-measurement technique 15 times farther into cosmic history than it has ever reached before, weighing a silent, invisible giant at the heart of a galaxy that stopped forming stars more than 10 billion years ago. Together, the results challenge the long-standing assumption that galaxies come first and black holes grow inside them.
"This is a remarkable finding," said Roberto Maiolino of the University of Cambridge, a co-author on the first study. "It's a paradigm shift, a total revisiting of the classical scenarios of how black holes form and grow."
How Did Scientists Weigh a Black Hole From the Dawn of the Universe?
The first paper centers on an object called Abell2744-QSO1 — a compact, ancient structure known as a Little Red Dot that existed just 700 million years after the Big Bang, more than 13 billion light-years away, and measures only 1,300 light-years across. Its light has been traveling since before Earth existed, which normally makes detailed study impossible. What makes QSO1 accessible is a cosmic accident: galaxy cluster Abell 2744, nicknamed Pandora's Cluster, sits between QSO1 and Earth, and its gravity bends and magnifies QSO1's light — creating three separate, magnified images of the same object in three positions in the sky.
Cambridge graduate student Ignas Juodžbalis and Cosimo Marconcini of the University of Florence used the NIRSpec (Near Infrared Spectrograph) instrument aboard JWST, operating in its R2700 Integral Field Spectroscopy mode, to map the velocity of hydrogen gas at different distances from QSO1's center. The technique resolves a spatial grid of spectra — simultaneously measuring not just how bright the gas is, but how fast it is moving and in what direction at each point. What they found was a Keplerian rotation curve: gas speed drops with distance from the center in exactly the pattern produced when the gravity of a single concentrated mass dominates, just as orbital velocities of planets slow with distance from the Sun.
If the mass inside QSO1 were spread across a population of stars rather than concentrated in a point, the rotation curve would be shallower and would not follow a Keplerian profile. The fact that it does, combined with the observed velocity gradient of roughly 10 kilometers per second across the object, points to a single central mass of approximately 50 million times the mass of the Sun — a black hole that accounts for more than two-thirds of QSO1's total mass. The black hole outweighs all surrounding stellar material by a factor of more than two. In nearby galaxies, that ratio runs to one in several thousand: the black hole is a rounding error against the galaxy's stellar bulk. In QSO1, the black hole is the dominant object, with only a thin envelope of primordial gas around it.
Composition mapping from the same NIRSpec observations confirmed the picture. The gas throughout QSO1 is almost entirely hydrogen and helium, with less than 1% of the Sun's metallicity — essentially no oxygen or carbon, the elements that accumulate when stars live and die. A galaxy rich with stellar history leaves behind heavy-element fingerprints. QSO1 has almost none, indicating it has experienced very little star formation despite hosting a black hole nearly as massive as the one at the center of the Milky Way's giant neighbor M87.
"This is important because it tells us that most of the mass of QSO1 is concentrated in the black hole at the center," Juodžbalis said. "If the mass were more distributed, as it would be if there were a lot of stars, the gas would not have this perfect Keplerian rotation."
Black Hole Before Galaxy: What Formation Models Can Explain This?
Prior to these findings, cosmologists operated under a working assumption that supermassive black holes grow from the inside out — stellar-mass black holes, the remnants of collapsed massive stars, merge and accrete over hundreds of millions of years, gradually assembling into supermassive structures. This is the "light seed" pathway, and it requires time the early universe did not appear to have. QSO1, at 700 million years after the Big Bang, has a black hole too massive and too starved of surrounding stellar material to have arrived there by successive mergers.
The most plausible alternatives are a direct-collapse black hole or a primordial black hole. In the direct-collapse scenario, a massive primordial gas cloud — composed almost entirely of hydrogen and helium — is bathed in intense ultraviolet radiation that destroys molecular hydrogen, the cloud's primary coolant. Unable to cool, the cloud cannot fragment into stars. Instead, it collapses as a whole, reaching densities of roughly 10 million grams per cubic centimeter and temperatures near 10 billion Kelvin, triggering a general relativistic instability that creates a black hole seed of between 100,000 and one million solar masses in a single step, without passing through a stellar phase at all. That seed then accretes rapidly to reach tens of millions of solar masses in a short period. A primordial black hole, by contrast, would form from extreme density fluctuations in the first second after the Big Bang — a scenario that requires physics beyond the Standard Model.
"It seems that we have found a black hole that does not have a substantial host galaxy and that has predated stellar processes," Juodžbalis said. "This is very exciting because it is evidence for primordial black holes or direct collapse black holes, which have been theorized but not confirmed."
Francesco D'Eugenio, also of the University of Cambridge, noted the significance of the measurement itself: "Before now, all of the mass measurements of black holes in the early universe have been indirect, based on assumptions from what we know about them in the local universe. We didn't know if those assumptions really apply to the distant universe."
The QSO1 measurement is the first to use gas dynamics directly — the same physical principle used to weigh the Milky Way's central black hole, work that earned the 2020 Nobel Prize in Physics. Its consistency with prior indirect estimates suggests those earlier measurements of other early-universe black holes were not wildly off, but the result also shows how dramatically different the proportional relationship between a black hole and its host can be at the universe's earliest times.
Dormant Black Hole at 10 Billion Light-Years: Stellar Dynamics Reaches New Distance
The second paper, led by Andrew Newman of Carnegie Science in Pasadena, takes a different technique to a different kind of object at an even more distant remove. MRG-M0138 is a massive galaxy more than 10 billion light-years away — observed as it appeared when the universe was roughly 3 billion years old, about a quarter of its current age. Unlike QSO1's black hole, which is actively surrounded by gas, MRG-M0138's central black hole is dormant: no material is falling in, and it emits no radiation. It is, in the most literal sense, invisible in every wavelength of light.
The only way to detect and measure a silent black hole is through its gravitational influence on nearby stars. The technique, called stellar dynamics, tracks how fast stars orbit at different distances from the galactic center. Stars closer to the black hole move faster; the velocity difference between inner and outer populations, modeled against the expected stellar mass distribution, yields the black hole's mass. This method has been used to measure black holes in nearby galaxies, including our own — the Nobel-winning work on the Milky Way's central black hole followed individual stars on multi-year orbits. At 10 billion light-years, no individual star is resolvable, but JWST's NIRSpec Integral Field Unit can measure the collective velocity dispersion of stellar populations within spatial regions of the galaxy.
The challenge is angular resolution. At such a distance, the region within which the black hole dominates the gravitational dynamics — the sphere of influence — subtends only fractions of an arcsecond. JWST alone would not be sufficient. The team exploited gravitational lensing: a massive foreground galaxy cluster lies directly between Earth and MRG-M0138, bending and magnifying the background galaxy's image by approximately 30 times in angular extent and producing four separate lensed images. Using the most magnified image, the team resolved stellar kinematics within the black hole's sphere of influence and modeled the enclosed mass.
The result: a black hole approximately 6 billion solar masses. The previous record for applying the stellar-dynamics technique to a dormant black hole stood at roughly 700 million light-years. MRG-M0138 sits 15 times farther, representing a qualitative leap in the reach of this measurement method.
"By combining JWST data with gravitational lensing, we could peer inside the black hole's sphere of influence, where its gravity boosts the speeds of stars," Newman explained. "This is one of the best techniques we have to weigh a black hole, so we were excited to extend it to a much earlier period in cosmic history."
Although now dormant, MRG-M0138 is thought to have hosted a powerful quasar in its past. Energy released during that rapid growth phase likely expelled or burned off the gas needed for continued star formation — a feedback mechanism that shut down the galaxy's stellar production and starved the black hole of further fuel, leaving both quiet. The result is a galaxy with ancient stars and a silent center, preserved as a fossil record of early cosmic history.
What Do Two Simultaneous Records Mean for Supermassive Black Hole Formation Models?
Taken together, the two papers compress the timeline of cosmic structure formation in ways that current models strain to accommodate. The standard cosmological picture has galaxies assembling first from collapsing gas and dark matter halos, then growing supermassive black holes at their centers over billions of years. Both QSO1 and MRG-M0138 show black holes that were already enormous when the universe was young — and in QSO1's case, one that appears to have arrived before the galaxy-building process had meaningfully begun.
"By demonstrating the feasibility of such a technique for galaxies in the early universe, we can now undertake a more complete census of how black holes develop over time, and infer their role in shaping galaxy evolution," said Richard Ellis, astrophysics professor at University College London and senior author on the Science paper.
Both teams are pushing the work further. The dormant black hole team analyzed four other gravitationally lensed galaxies alongside MRG-M0138 and is continuing that analysis. The Euclid space telescope, currently surveying the sky in wide field, and NASA's Nancy Grace Roman Space Telescope, under development, will identify far more gravitationally lensed ancient galaxies suitable for this technique — enabling the statistical census that single pointed observations cannot. The Giant Magellan Telescope, under construction at Carnegie Science's Las Campanas Observatory in Chile, will bring still finer stellar-kinematic resolution to distant galaxies once complete.
The QSO1 team, meanwhile, is analyzing similar Little Red Dots to test whether galaxy-predating black holes were common in the early universe — which the direct-collapse model predicts — or whether QSO1 is an outlier. If the former, it would suggest that the universe's heaviest residents arrived before the neighborhoods around them did, and that galaxies assembled around preexisting black hole seeds rather than growing their own.
These findings also arrive during a complicated period for U.S. space science. The Trump administration's proposed FY2026 NASA budget would reduce JWST's operational funding by roughly 25–35% from its 2024 allocation, a cut that scientists have warned could reduce the telescope's observing efficiency. Both papers published this week drew on observations already made; whether the census those teams now want to build will have full resources behind it remains a matter of congressional appropriations.
Frequently Asked Questions
How did scientists confirm that a black hole predates its galaxy?
Using JWST's NIRSpec instrument in Integral Field Spectroscopy mode, researchers mapped the velocity of hydrogen gas at different distances from the center of QSO1, a compact object from 700 million years after the Big Bang. The gas follows Keplerian rotation — the same pattern planets use to orbit the Sun — meaning a single concentrated mass dominates the gravitational field. That mass is a 50-million-solar-mass black hole accounting for more than two-thirds of QSO1's total mass, with almost no surrounding stellar material, indicating the galaxy had not yet formed around it.
What is a dormant black hole, and why is it hard to detect?
A dormant black hole is one that is not actively accreting gas. Active black holes, called quasars or active galactic nuclei, release enormous radiation as infalling material heats up and emits light across the electromagnetic spectrum. A dormant black hole produces no such emission and is invisible in every wavelength. Detecting one requires measuring its gravitational pull on surrounding stars — a technique previously limited to galaxies within about 700 million light-years, and now extended to more than 10 billion light-years using JWST combined with gravitational lensing.
What are direct collapse black holes, and how do they form?
Direct collapse black holes form when a massive primordial gas cloud collapses without first fragmenting into stars. This requires the cloud to be bathed in ultraviolet radiation that destroys molecular hydrogen, its primary coolant. Without cooling, the entire cloud collapses in a single gravitational event, reaching densities and temperatures that trigger a general relativistic instability and produce a black hole seed of 100,000 to one million solar masses — formed without a stellar phase and far more massive than any remnant a dying star could leave behind. QSO1 is consistent with this formation channel, though a primordial black hole origin from early-universe density fluctuations cannot yet be ruled out.
Can a black hole form before its galaxy?
The standard formation model assumed galaxies assembled first, then grew supermassive black holes at their centers through stellar collapse and mergers over billions of years. QSO1, as measured by JWST, directly challenges this: its black hole outweighs all surrounding stellar mass by more than a factor of two, its gas is nearly metal-free indicating minimal star formation, and it existed just 700 million years after the Big Bang. This is the first direct observational evidence that at least some supermassive black holes formed before — or entirely independently of — a significant host galaxy, consistent with direct-collapse black hole theory.
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