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Astronomers have detected a colossal pair of jets emerging from a supermassive black hole located 7.5 billion light-years from our planet. Stretching across an impressive 23 million light-years, these jets are the largest ever observed, according to cutting-edge findings published in a recent study.

Black holes are often seen as the ultimate consumers in the cosmos, drawing in nearly everything that ventures too close. However, a tiny portion of material is propelled outward before being swallowed, creating jets that emerge from both ends of the black hole, explained Martijn Oei, a postdoctoral researcher at the California Institute of Technology and the primary author of this new study.

The research was shared on September 18 in the journal Nature.

These powerful jets accelerate particles and radiation near the speed of light, causing them to radiate in wavelengths detectable by radio telescopes. It was this glow that drew scientists to the new jets, using the LOw Frequency ARray (LOFAR) radio observatory in Europe while scanning the sky in 2018.

The newly discovered jets, emitting energy equivalent to trillions of Suns, have earned the nickname "Porphyrion," a reference to a mighty giant from Greek mythology, due to their massive scale.

This finding is reshaping astronomers’ thoughts on the limits of black hole jets, raising new questions about how these immense features influence their surroundings and contribute to the overall structure of the cosmos.

“These jets are not limited to a solar system or even a galaxy the size of the Milky Way; we’re talking about something 140 times wider than the Milky Way,” Oei remarked. “On that scale, our own galaxy would appear as nothing more than a blip within the enormous jets.”

Searching for the Cosmic Web

Initially, astronomers were using LOFAR to search for intricate, thread-like filaments of the cosmic web.

The cosmic web is the universe's vast network, stretching out across the space between galaxies, Oei explained.

During this search, however, they discovered something unexpected—these massive black hole jets. In total, they identified 10,000 new pairs of jets, a discovery detailed in another forthcoming study in the journal Astronomy & Astrophysics.

“We were astonished when we came across these giant jets,” Oei admitted. “We had no idea so many existed.”

At the heart of massive galaxies reside supermassive black holes. The team's observations indicated that more and more galaxies host black hole jets that stretch far beyond their boundaries, according to Oei.

The largest pair of jets was first identified by study coauthor Aivin Gast, a student researcher who was pursuing classical archaeology and ancient history at Oxford when the pandemic temporarily halted his academic studies. During that period, Gast volunteered to assist Oei in analyzing radio data from LOFAR.

“It was exhilarating to co-discover something like Porphyrion,” Oei said in an email. After verifying the galaxy from which the jets originated, “Aivin, with his classical studies background, proposed the name 'Porphyrion,’ which we've enthusiastically embraced,” Oei added.

Before these observations, it was believed that such enormous jet systems were rare and would be much smaller. Prior to Porphyrion's identification, the record for the most gigantic black hole jet system belonged to Alcyoneus.

The same research team uncovered Alcyoneus, another Greek mythology-inspired name, in 2022, with a size equivalent to about 100 Milky Way galaxies.

It’s estimated that the Milky Way spans around 100,000 light-years in diameter. A light-year represents the distance that light travels in one Earth year—about 5.88 trillion miles (9.46 trillion kilometers).

However, the research team chose to consider the Milky Way’s full extent, expanding it to include all its stars and unseen dark matter, leading to an estimate of 163,078 light-years across, Oei stated.

Thus, they concluded that Porphyrion extends over a distance equivalent to 140 Milky Way diameters.

Researchers now believe they may soon detect even larger jets, as advancements in radio telescope technology open new possibilities.

Unraveling a Galactic Mystery

To further understand the origins of these jets, the team conducted follow-up observations using India’s Giant Metrewave Radio Telescope and Hawaii’s W. M. Keck Observatory. Their analysis pointed to a distant galaxy roughly 10 times the size of the Milky Way.

Surprisingly, the jets originated from a radiative-mode active black hole—typically not the type that produces large jets. This unexpected find left researchers intrigued.

When black holes become active, they pull in nearby material, which then heats up and emits energy either as radiation or as jets. Radiative-mode black holes are common in the early universe, while jet-mode black holes are predominant in our local universe.

“Our findings suggest that radiative-mode black holes may be just as capable of producing massive jets as jet-mode black holes in closer galaxies,” Oei noted. “This teaches us that colossal jets may be an ancient phenomenon, possibly existing for most of the universe's history. With LOFAR, we’ve examined only 15 percent of the sky, and even then, spotting these immense jets is very challenging, so we’re confident that many more are out there waiting to be found.”

A deeper understanding of how long these immense jets have persisted over the universe’s 13.8 billion years could help scientists grasp their influence on cosmic evolution.

Astronomers are currently grappling with two major dilemmas: how the universe became magnetized and how the large-scale cosmic web structures developed. These black hole jets may provide valuable insights into both mysteries.

If jets last for millions of years, they could release magnetic fields and charged particles, altering the flow of matter throughout intergalactic regions, the researchers propose.

“When these jets reach the intergalactic realm, they appear to significantly affect the heating and magnetization of space between galaxies," Oei explained. "This new discovery reinforces the idea that jets can extend to the scale of the cosmic web. Their reach can be vast.”

Porphyrion’s powerful jets have indeed generated extreme conditions, resulting in the heating of surrounding space by around 1 million degrees, according to Oei.

“If this heating occurred early enough, it might have slowed down the cooling and collapse of matter needed to create new galaxies,” Oei said.

Unlocking More Cosmic Mysteries

The team is continuing to explore how these black hole jets can remain stable while extending so far beyond the host galaxy.

“Martijn’s work reveals that there’s nothing particularly unique about the environments of giants like these that would cause them to grow to such immense proportions," said Martin Hardcastle, professor of astrophysics at the University of Hertfordshire, in an official statement.

This discovery acts like a “fossil record” of supermassive black hole activity and helps to trace how such jets evolve, suggested Sasha Tchekhovskoy, an associate professor of physics and astronomy at Northwestern University.

“The incredible lifespan of these jets allows us to put our physical models to the test, particularly regarding their stability as they carve through intergalactic space,” noted Tchekhovskoy, who was not directly involved in the study.

Porphyrion likely magnetized its surrounding space, sparking Oei’s curiosity about how such forces spread their magnetism across the cosmic web. This is a crucial area of study, as magnetic fields, much like Earth’s, help protect life-sustaining environments.

“Life on our planet thrives thanks to Earth’s magnetism. Now, we’re keen to trace its origin,” Oei explained. “We know magnetism already permeates the cosmic web, eventually reaching stars and planets. The burning question is: Where does it all begin? Could these massive jets be responsible for magnetizing the universe?”