Oldest quasars ever discovered add to 'perplexing' space mystery

The Euclid space telescope has spotted the oldest quasars, the brightest objects in the universe, ever discovered, deepening a cosmic mystery that has been puzzling scientists. The science-journalism coverage adds useful context, while the strongest evidential footing still comes from the underlying data, papers or institutional documentation.

It matters because astrophysics becomes persuasive only when an observed signal can be tied to a physically defensible explanation. Compact objects such as neutron stars and black holes are natural laboratories for extreme physics, but the distance and complexity of these systems make interpretation difficult without multi-wavelength coverage and careful modeling. A detection without a mechanism is only half a result. the other half comes from showing that the signal fits quantitatively inside a coherent physical picture rather than merely being consistent with a broad family of models. This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Add as preferred source This graphic shows the location of the 31 newly discovered.

The farthest quasar is the one on the right and is named EUCL J172902.75+641018.1 (redshift of 7.77), and the second-farthest (the red dot on the left) is named EUCL J125308. This all-sky view is overlaid on ESA Planck's map from 2014, with the bright horizontal band corresponding to the plane of our Milky Way galaxy, where most of its stars reside are.

Jean-Charles Cuillandre, João Dinis The Euclid space telescope has spotted the oldest quasars, the brightest objects in the universe, ever discovered, deepening a cosmic mystery. In a study published Monday, an international team of astronomers announced it had discovered 31 quasars, including the two oldest observed yet, using the European Space Agency's.

The light from the oldest pair comes from when the universe was roughly 670 million years old, just 5% of its current age of 13.8 billion years. This beats the team's previous record for oldest, and therefore most distant, quasar, announced in 2021, by around 20 million years.

The broader interest lies in turning an observational clue into something that can be weighed against competing models of the underlying physics. Astrophysics does not have the luxury of controlled experiments; everything is inferred from radiation that traveled across cosmic distances under conditions that cannot be reproduced in a terrestrial laboratory. This makes the interpretation chain longer and more uncertain than in bench science, but it also means that a well-constrained measurement of an extreme object carries theoretical information that no earthbound experiment can provide.

Previous quasar hunts were mostly carried out with ground-based telescopes, but the launch of Euclid in 2023 "has transformed this field," Daming Yang, the lead author of the. Discovery of 31 new quasars at 6.6 Astronomy and Astrophysics (2026).

Because this item comes through Phys. org Space as science journalism, it should be treated as contextual reporting rather than primary evidence. Good science reporting can identify why a result matters, connect it to the wider literature and make technical work readable, but the decisive evidence remains in the original paper, dataset, mission release or technical record. That distinction is especially important when a story is later repeated by aggregators, because repetition increases visibility, not evidential strength.

The next step is to see whether independent datasets and physical modeling converge on the same interpretation. Multi-wavelength follow-up, combining X-ray, radio and optical data where possible, is typically what separates a compelling detection from a robust physical characterization. In high-energy astrophysics, results that initially looked definitive have been revised when data from a second messenger arrived; the current result should be read with that history in mind.

Source