Building a black hole a billion times the mass of the Sun takes time, and 900 million years is not much of it. Astronomers have now found two such giants sharing the same small patch of the early universe: a compact quasar pair seen when the cosmos was about a thirteenth of its present age. A quasar is a black hole feeding so fast that the gas spiralling into it outshines every star in its host galaxy. Finding one at this epoch is hard enough. Finding two, almost touching, is something the models did not prepare anyone for.
The system, catalogued as J1602+4228AB, was described on 10 November 2026 in The Astrophysical Journal Letters by a team led by Silvia Onorato of NSF NOIRLab and the International Gemini Observatory (Onorato et al. 2026). Its Hawaiian name, Nāpōwawāʻenakaulua, was created by Larry Kimura through the A Hua He Inoa naming programme and describes two bodies of deep darkness whose heat and brilliance return energy to the universe. The brighter quasar has been known since 2004. Its companion only appeared when the team inspected data from Aether, a James Webb Space Telescope (JWST) programme that has taken spectra of 200 quasars from this era, about 43 per cent of all those known.
On the sky, the two quasars sit 0.98 arcseconds apart. At a redshift of about 6.08 (a measure of how far cosmic expansion has stretched their light), that corresponds to 5.56 kiloparsecs, or roughly 18,100 light-years, which is about a fifth of the width of the Milky Way. Their redshifts agree so closely that the implied velocity difference is only about 15 km/s. From the widths of their hydrogen emission lines, which trace how fast gas orbits each black hole, the team estimates masses of about 1.5 billion and 400 million Suns. Both appear to be feeding at or slightly above the Eddington limit, the rate at which the outward push of radiation should balance the inward pull of gravity.
Separating them from the ground was its own small feat. The companion is far fainter than its neighbour and less than a second of arc away, yet the Gemini Near-Infrared Spectrograph on Gemini North pulled its spectrum clear of the brighter quasar. According to the NOIRLab release, steady air over Maunakea let the team gather the data in two nights. A second Gemini instrument then added optical spectra of the faint source. The closest previous quasar pairs at comparable distances are separated by 7.3 and 12 kiloparsecs, and the nature of the second is still debated.
The statistics are where it gets interesting. Across the 199 Aether fields, this is the only companion quasar the survey turned up. Yet when the team set that single detection against extrapolations of how early quasars cluster on larger scales, the pair appeared somewhere between 100 and 1,000 times more often than expected. Either galaxy mergers were switching on two quasars at once, or this pair sits in an unusually dense knot of matter. Theory already says the first giant black holes needed exactly such rich surroundings to grow so quickly. Close pairs are also the ancestors of the black hole binaries whose combined gravitational wave background pulsar timing experiments such as NANOGrav may have begun to pick up.
Here is the catch: the pair might not be a pair. A foreground galaxy acting as a gravitational lens can split one quasar’s light into two images, and archival Hubble Space Telescope pictures do show a candidate galaxy close to the line of sight to the fainter source. The team argues against a lens because the spectra differ: the outflowing gas traced by oxygen emission has a different profile in each, which a lens should not produce. Even so, the authors describe the system as a candidate and say a full lens model is still needed. The black hole masses carry their own uncertainty of about a factor of two, because they rest on scaling relations rather than direct measurement. And one system, however striking, cannot say how common such pairs really are.
Those questions now have a clear target. The preprint promises a lens model and a closer look at the gas moving between the two quasars, which would show whether they are genuinely interacting.
If they are bound together, a long fall lies ahead. The drag of surrounding stars and gas should slowly draw the two black holes into a tight binary and, eventually, a merger. None of that is visible yet. What reaches us is an earlier moment, when both were awake at once and feeding hard in a universe that had barely begun.
