Quick Summary: The European Space Agency’s Euclid Space Telescope has discovered 31 new quasars in the early universe. The most remarkable of them is now the oldest and most distant quasar ever observed, shining just 670 million years after the Big Bang with a luminosity equivalent to roughly one trillion Suns.
Why is the oldest quasar in the universe generating so much excitement?
When we look into the sky, we are actually looking into the past. Because light takes time to reach us, extremely distant objects also carry records from very ancient eras. A new discovery made with the European Space Agency’s Euclid Space Telescope is a striking example of this principle.
Researchers identified 31 new quasars from the early universe. One object in particular stands out from the rest, having been confirmed as the oldest and most distant quasar ever observed.
This quasar was already shining just 670 million years after the Big Bang. On cosmic timescales, that corresponds to the universe’s infancy.
The power of its light is almost beyond comprehension. According to scientists’ calculations, its brightness is equivalent to the combined light of approximately one trillion Suns.
So what exactly is a quasar?
Quasars are among the brightest objects in the universe. Their energy does not come from stars, but from supermassive black holes.
As a black hole at the center of a galaxy consumes surrounding gas and dust, a rotating disk of compressed matter forms around it. This structure is known as an accretion disk. As material in the disk spins at extreme speeds, it heats up and releases enormous amounts of energy.
Here is the fascinating part: the black hole itself emits no light. However, the matter feeding it becomes so luminous that it can outshine all the stars in its host galaxy combined.
That is why quasars can be detected from billions of light-years away. For astronomers, they serve as natural beacons that illuminate the early universe.
“Ancient quasars are rare discoveries. They are fascinating in their own right, but they are also time machines that allow us to investigate the early universe and understand how the first generation of galaxies emerged.” — ESA Euclid Project Scientist Valeria Pettorino
What does this discovery reveal about the era of reionization?
The newly discovered quasars come from a crucial chapter in cosmic history known as the era of reionization. This period began roughly 680 million years after the Big Bang and lasted until about 1.1 billion years afterward.
In the universe’s earliest epochs, free electrons and protons constantly scattered light. As a result, space was far less transparent than it is today. Astronomers sometimes refer to this phase as the cosmic dark ages.
Later, the first stars, galaxies, and active black holes began to appear. The high-energy radiation they produced transformed the surrounding gas and allowed photons to travel more freely through the cosmos.
The era of reionization marks exactly this dramatic transition. The 31 newly identified quasars provide researchers with valuable data for understanding the details of this process.
The discovery also strengthens the possibility that black holes in the early universe grew faster than expected. After all, we are seeing extraordinarily bright and active systems at a time when the universe was still very young.
A numerical summary of the discovery
I’ve gathered the key figures from the story in the table below. They clearly illustrate why this discovery has attracted such significant attention across the astronomy community.
| Parameter | Value |
|---|---|
| Number of newly discovered quasars | 31 |
| Epoch of the oldest quasar observed | 670 million years after the Big Bang |
| Luminosity | Approximately 1 trillion Suns |
| Beginning of the era of reionization | Approximately 680 million years after the Big Bang |
| End of the era of reionization | Approximately 1.1 billion years after the Big Bang |
| Observatory | ESA Euclid Space Telescope |
Why does the Euclid Space Telescope excel at discoveries like this?
As many people know, the Euclid mission was primarily designed to study dark matter and dark energy. However, the telescope’s ability to survey vast regions of the sky with exceptional sensitivity is also opening the door to unexpected discoveries.
By systematically scanning large portions of the sky, Euclid has become a powerful tool for identifying extremely distant galaxies and quasars. This allows astronomers to uncover rare objects within enormous datasets rather than selecting targets one by one.
The James Webb Space Telescope has frequently made headlines in recent years for its early-universe research. If that interests you, you may also enjoy our article about James Webb’s fourth anniversary, celebrated with a stunning image of Centaurus A.
Euclid and James Webb are actually complementary instruments. While Euclid identifies intriguing targets across wide areas of the sky, James Webb can examine those targets in extraordinary detail.
This reflects a broader trend in modern astronomy: different observatories working together to achieve results that no single telescope could accomplish alone.
Does this discovery raise new questions about the origins of black holes?
Yes. In fact, this may be the most intriguing aspect of the discovery.
For such brilliant quasars to exist when the universe was only a few hundred million years old, the black holes at their centers must have grown extremely rapidly. Yet the exact mechanism behind that growth remains a subject of debate.
Some models suggest that small black holes formed from the collapse of the first stars gradually grew into giants. Other scenarios propose much heavier seed black holes formed directly from massive clouds of gas.
As more examples of ancient quasars are discovered, it will become easier to test which model most closely reflects reality. That is why these 31 new discoveries are more than just a number—they represent a new laboratory for studying the physics of the early universe.
Research into the distant universe can also advance through unexpected methods. A great example is the hidden planet discovered in TESS data thanks to Einstein’s theories, demonstrating how gravitational effects can become powerful tools in astronomy.
What can we expect in the future?
The Euclid mission is still in its early stages. As the telescope continues surveying the sky, it may uncover even more distant quasars and galaxies from earlier cosmic epochs.
In fact, it would not be surprising if the current record-holder is eventually surpassed by an even older object. Astronomy has a long history of records being broken.
It is also worth remembering that space exploration is not limited to distant galaxies. For example, NASA’s latest step toward the Skyfall Mars helicopter shows that discoveries within our own Solar System are advancing just as rapidly.
The point that stands out most to me is this: the more we investigate the universe’s earliest eras, the more new questions we uncover rather than definitive answers. That is one of the most exciting aspects of science. Every discovery opens the door to an even deeper mystery.
Frequently Asked Questions
How old is the oldest known quasar?
The newly discovered quasar is observed as it existed about 670 million years after the Big Bang and is currently regarded as the oldest known quasar.
Why are quasars so bright?
The source of their brightness is not the black hole itself, but the intensely heated matter in the accretion disk that emits enormous amounts of light before falling into the black hole.
What is the mission of the Euclid Space Telescope?
Euclid’s primary goal is to investigate dark matter and dark energy. It also reveals important cosmic targets such as distant galaxies and quasars.
Sources
Editor’s Perspective: What fascinates me most when reading stories like this is that the light we are seeing today began its journey when the universe was still incredibly young. In a sense, telescopes are not only looking into space—they are peering deep into time itself. Every new quasar discovery helps fill in another missing piece of the puzzle of how the first galaxies came to be.
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