The James Webb Space Telescope has just captured the first direct measurement of a black hole

By Space Daily Editorial Team

The official ESA Webb announcement on 27 May 2026 and two papers report the first

direct mass measurement of a supermassive black hole in the first billion years after the Big

Bang. The object sits at the heart of a small red galaxy called Abell2744-QSO1, seen as it was

roughly 700 million years after the Big Bang. The mass comes out at 50 million times the mass

of the Sun. The galaxy around it is so faint that the central object accounts for around two-thirds

of the total mass of the system and is more massive than all the stars in the galaxy combined.

If the measurements hold, the implications run against the standard idea of how supermassive

black holes form, which has the galaxy assembling first and the central black hole growing in

step with it.

QSO1 belongs to a class of objects called Little Red Dots, first identified by the James

Webb Space Telescope (JWST) shortly after its commissioning in 2022. These are very compact,

very red sources, common in the first billion years of cosmic history and almost entirely absent

in the local universe. Previous mass estimates for black holes in the first billion years had relied

on indirect methods, mostly calibrated against scaling relations observed in the local universe.

These methods give an answer but carry the assumption that the physics of black hole accretion

in the distant past was broadly similar to what is observed nearby. According to Space.com’s

report on the work, D’Eugenio explained the team’s concern with that approach plainly: “We

didn’t know if those assumptions really apply to the distant universe”.

The galaxy itself contains relatively few stars. According to Universe Today’s coverage of

the papers, the stellar mass is constrained to be below roughly 20 million solar masses, and

some analyses push the upper limit considerably lower. The black hole is therefore more

massive than all the stars in its galaxy combined, by at least a factor of two and possibly far

more. The authors note in the paper published in Nature that QSO1 sits about a factor of ten

above even the most extreme cases of black-hole-heavy galaxies previously identified by the

JWST. The standard picture of supermassive black hole formation has the black hole growing

alongside its host galaxy, in a feedback relationship that takes billions of years. QSO1 cannot

have formed this way. The galaxy is too small to have fed the black hole through ordinary

accretion, and the time elapsed since the Big Bang at the moment of observation is too short

for slow co-evolution to have produced this result.

The team’s preferred interpretation, presented as such rather than as a conclusion, is

that the black hole formed first and the galaxy is now assembling around it. Ignas Juodžbalis,

one of the authors of the Nature paper, said that “This is very exciting because it is evidence

for primordial black holes or direct collapse black holes, which have been theorized but not

confirmed”. What the papers establish, in a narrower and more defensible sense, is that the

standard local scaling between black hole mass and host galaxy mass does not apply in the

first billion years. Whether QSO1 is unusual among Little Red Dots, or whether the population

as a whole follows the same pattern, is the next question the Cambridge–Florence team is

pursuing.

(Available at: https://spacedaily.com/d-the-james-webb-space-telescope-has-just-captured-the-first-direct-measurement-of-a-black-hole-50-million-times-the-mass-of-the-sun-sitting-in-an-ancient-galaxy-where-it-outweighs-every-star-around-i/ – text specially adapted for this test).