The European Space Agency’s (ESA) Euclid telescope has identified 31 ancient quasars, including the two oldest known to date, dating back to 670 million years after the Big Bang. These supermassive black hole cores, which possess masses billions of times that of the Sun, challenge existing cosmological theories regarding how such massive structures formed so rapidly in the early Universe.
How the Euclid Telescope Changed Quasar Research
Until recently, astronomers relied primarily on ground-based telescopes to hunt for these distant, ultra-bright galactic nuclei. The launch of the Euclid mission in 2023 shifted the landscape of deep-space observation. According to Daming Yang, a doctoral candidate at Leiden University and lead author of the study published in Astronomy & Astrophysics, the mission has effectively doubled the number of known ancient quasars in just two years.
Quasars are fueled by supermassive black holes devouring surrounding matter. This intense accretion process generates a luminosity that can outshine thousands of billions of stars.
Why These “Monsters” Defy Current Theory
The discovery of these 31 quasars highlights a growing discrepancy between observation and theoretical prediction. As telescope technology advances, researchers are spotting galaxies and objects that appear significantly larger and more mature than what theory predicts for such an early era of the history of the Universe.
Joseph Hennawi, a co-author of the study, notes that these objects present a significant puzzle for the scientific community. “Each step we take toward the past makes the enigma more baffling,” Hennawi stated. The core issue remains the timeline: these objects—whose mass reaches several billion times that of the Sun—existed when the Universe was in its infancy, leaving scientists to question the rapid growth mechanisms involved.
What Happens Next in Early Universe Research?
To solve the mystery of how these structures grew so quickly, researchers are now looking even further back in time—targeting the era when the Universe was only 630 million years old. The current strategy involves a multi-instrument approach. Scientists plan to study quasars recently discovered using the James Webb Space Telescope to learn more about them.
By using these quasars as “lighthouses,” astronomers aim to study the gas located between these objects and Earth. This process allows them to reconstruct the process of the “reionization” of the Universe over the course of its history, the period when the first stars and galaxies emerged and dissipated the cosmic fog.
Follow the official ESA Euclid mission page for the latest updates on deep-space imaging and mission milestones.
Frequently Asked Questions
- What is a quasar?
A quasar is the nucleus of a primitive galaxy, powered by a supermassive black hole consuming surrounding matter at a high rate. - Why do scientists look for older quasars?
They serve as probes to help researchers understand the “reionization” period of the early Universe and the formation of the first galaxies. - How does Euclid compare to previous telescopes?
Euclid has significantly accelerated the discovery rate of ancient quasars compared to traditional ground-based observations, identifying 31 new candidates in just two years.
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