A Signal from the Early Universe
A telescope designed to investigate the dark universe has opened another window onto cosmic history. Using observations from the European Space Agency’s Euclid mission, astronomers have identified 31 previously unknown quasars from the universe’s first billion years. Twelve have redshifts of 7 or greater, more than doubling the number known in that exceptionally early period.
The most distant of the group, EUCL J172902.75+641018.1, has a measured redshift of about 7.77. Its light began traveling when the universe was roughly 670 million years old. The finding, published July 6, 2026, makes it the most distant quasar reported to date—not the oldest object of every kind, but a new record within a rare and scientifically valuable class of objects.
What Euclid changed
Quasars are intensely luminous galactic centers powered as matter falls toward supermassive black holes. Finding them in the early universe is difficult because they are both extremely distant and rare. Previous searches tended to capture the brightest outliers, leaving astronomers with too few examples to describe the population with confidence.
The new quasars were selected from about 3,000 square degrees observed during the first year and a half of the Euclid Wide Survey. Researchers applied machine-learning and probabilistic methods to visible and near-infrared images, supplemented the search with data from other surveys, and then used the Keck, Magellan and Large Binocular telescopes for spectroscopic confirmation.
That process matters as much as the record. Many of the newly identified quasars extend observations toward the fainter end of the early quasar population. Instead of adding only another spectacular exception, Euclid is beginning to provide something closer to a census.
Why ancient quasars matter
The existence of luminous quasars so soon after the Big Bang raises a basic question: How did some black holes become enormous so quickly? A larger and more varied sample gives astronomers better evidence for testing models of black-hole formation, growth and interaction with young galaxies.
These quasars also illuminate the epoch of reionisation, when energetic radiation transformed much of the hydrogen between galaxies from a neutral state into an ionised one. Their spectra can be used to investigate the material through which their light traveled, making quasars not merely distant objects but probes of the evolving universe around them.
The second-most-distant quasar in the group has already received closer study. Researchers found it within a dusty, gas-rich galaxy undergoing rapid star formation, offering a glimpse of the environment surrounding an actively growing supermassive black hole in the young universe.
An instrument can be more than its main assignment
Euclid’s central mission is to map the large-scale structure of the universe and investigate dark matter and dark energy. Its quasar discoveries illustrate why ambitious scientific instruments are rarely limited to a single question. Euclid combines broad sky coverage, depth, sharp imaging and infrared observations from space. Those capabilities also make it unusually effective at finding scarce objects whose light has traveled for more than 13 billion years.
The discoveries did not come from the spacecraft alone. They depended on data processing by a large international consortium, comparison with other surveys and confirmation by major ground-based observatories. Modern astronomy increasingly works this way: one instrument discovers candidates, others test them, and shared infrastructure turns faint signals into defensible knowledge.
What this changes for humans
No quasar discovery will alter an ordinary morning. Its value lies on a different timescale. It expands the range of cosmic history that humanity can examine with evidence rather than speculation. It makes theories of early black-hole growth more testable. It also demonstrates that a public scientific instrument built around one profound mystery can create opportunities that its designers could anticipate only in part.
That is one answer to why society invests in telescopes aimed at realities far removed from daily experience. Such instruments preserve our capacity to ask questions whose practical value is not yet obvious, coordinate expertise across borders and generations, and revise our account of where we are. Wonder is part of the return, but so are disciplined uncertainty and the ability to discover that the universe is stranger than our previous evidence allowed.
Sources and Further Reading
- European Space Agency: “Euclid discovers the most ancient quasar in the Universe”
- Yang et al.: “Euclid: Discovery of 31 new quasars at 6.6 < z < 7.8,” Astronomy & Astrophysics
- Euclid Consortium: “Press Release: Two most distant quasars”
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