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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Just Found the Rarest Galaxy Merger Ever For The First Time & It's Creating a Cosmic Giant

The universe is so enormous that it is often difficult for our minds to truly understand its scale. We can easily imagine mountains, oceans, or even planets, but when scientists talk about galaxies containing hundreds of billions of stars, the numbers become almost impossible to picture. Every now and then, however, astronomers discover something so extraordinary that it reminds us just how vast and dynamic the universe really is.

One such discovery is a remarkably rare cosmic event: six giant galaxies are in the process of merging into a single enormous galaxy. This incredible finding, described in a new research paper published on the arXiv preprint server by astronomers led by Z.L. Wen of the Chinese Academy of Sciences, offers scientists a rare opportunity to witness one of the largest galaxy-building events ever observed.

A Cosmic Traffic Jam Unlike Any Other

Galaxy mergers are not unusual in the universe. Over billions of years, gravity slowly pulls galaxies toward one another, causing them to collide and eventually combine into larger galaxies. Our own Milky Way is expected to merge with the Andromeda Galaxy in about 4.5 billion years.

However, what makes this new discovery extraordinary is that six massive galaxies are merging at the same time. Such an event is incredibly rare and has almost never been seen before.

At the center of a distant galaxy cluster lies this unusual group of six giant galaxies. As gravity pulls them together, they are gradually combining into one enormous galaxy that will eventually become the cluster's Brightest Cluster Galaxy (BCG)—the largest and brightest galaxy within its galaxy cluster.

Hidden in Plain Sight

Interestingly, astronomers did not discover this galaxy cluster recently. It was first identified in 2018 through several large sky surveys, including the Two Micron All Sky Survey (2MASS), WISE, and SuperCOSMOS.

The real surprise came years later when scientists carefully analyzed images from the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys. These detailed observations revealed something hidden at the cluster's center: not just one or two interacting galaxies, but six giant galaxies caught in the middle of a massive merger.

To study the system in greater detail, researchers used observations from the Mayall Telescope in Arizona, the Bok Telescope, and the Blanco Telescope in Chile. Together, these powerful observatories helped reveal one of the most spectacular galaxy mergers ever recorded.

A Giant Cloud of Wandering Stars

One of the most fascinating discoveries surrounding the merger is a huge glowing cloud known as Intracluster Light (ICL).

This faint glow stretches about 310 kiloparsecs across space. For comparison, one kiloparsec equals about 3,260 light-years, making this cloud more than one million light-years wide.

The glowing cloud is made of stars that no longer belong to any individual galaxy. During the violent collisions, powerful gravitational forces ripped countless stars away from their home galaxies. These orphaned stars now drift freely throughout the galaxy cluster, creating a faint cosmic fog.

Because the six galaxies themselves are so bright, astronomers first had to remove their light from the images before they could detect this enormous halo of wandering stars.

These Are Not Ordinary Galaxies

The scale of this merger becomes even more astonishing when looking at the galaxies involved.

Five of the six galaxies each contain more than 100 billion times the mass of our Sun. Since the Sun is just one ordinary star, that means each galaxy contains roughly 100 billion stars or more.

Imagine combining six cities, each larger than anything on Earth. Now replace those cities with galaxies containing hundreds of billions of stars, enormous clouds of gas, dark matter, and likely supermassive black holes at their centers. That is the scale of what astronomers are observing.

When the merger is finally complete, the newly formed galaxy is expected to have a total mass of about 1.16 trillion times the mass of the Sun.

According to the researchers, this final galaxy will be significantly larger than scientists would normally expect based on existing models of galaxy formation. It could become one of the most massive galaxies ever observed.

A Slow Process on a Cosmic Clock

Although the collision sounds dramatic, it happens incredibly slowly.

Scientists estimate that the complete merger will take somewhere between 800 million and 1.9 billion years.

While that seems unimaginably long to humans, it is actually quite fast on cosmic timescales. Since the universe is approximately 13.8 billion years old, this merger represents only a small fraction of its history.

Today, astronomers are fortunate enough to catch the system while the collision is actively taking place.

An Event Almost Never Seen Before

Perhaps the most surprising part of the discovery is just how incredibly rare this system is.

The research team examined 52,803 nearby galaxy clusters using DESI survey data.

Out of all those clusters, only one contained more than four galaxies merging together at the same time.

That means the odds of finding such a system were roughly 1 in 52,803.

For comparison, scientists found:

  • 2,233 clusters containing two merging galaxies.

  • 12 clusters containing four merging galaxies.

  • Only one cluster with six galaxies merging simultaneously.

The extraordinary system is known as WHY J0501+01, making it one of the rarest galaxy mergers ever identified.

A Violent and Chaotic Environment

Astronomers describe the galaxies in this cluster as "unrelaxed."

Despite sounding calm, the term actually means the exact opposite.

Normally, galaxies in a mature cluster settle into a relatively stable arrangement. In this case, everything is in chaos. The galaxies are pulling on each other with enormous gravitational forces, throwing stars, gas, and dark matter in every direction.

To better understand this violent activity, scientists observed the system using the Einstein Probe's Follow-up X-ray Telescope (EP-FXT).

The X-ray observations revealed huge amounts of extremely hot plasma—the gas between galaxies—sloshing around like water in a shaken bowl.

Researchers also detected a long tail of hot plasma extending away from the collision site. This feature is believed to have formed as the galaxies crashed into one another, further confirming that the merger is still actively unfolding.

Why This Discovery Matters

Astronomers believe that the largest galaxies in the universe are built through repeated mergers over billions of years. However, actually witnessing such an extreme event is exceptionally rare.

By studying this six-galaxy collision, scientists can test theories about how giant galaxies grow, how stars are stripped away during mergers, and how hot gas behaves in these enormous cosmic collisions.

The discovery also offers clues about the future evolution of galaxy clusters throughout the universe.

Although our own Milky Way will eventually merge with the Andromeda Galaxy, that event involves only two galaxies. The six-way merger seen in WHY J0501+01 is on an entirely different level, giving researchers a unique laboratory for studying the universe's most dramatic gravitational interactions.

A Front-Row Seat to Cosmic History

The universe is constantly changing, but many of its biggest events unfold over billions of years, making them difficult to observe. Discoveries like this provide astronomers with a rare snapshot of one of nature's grandest construction projects.

Watching six massive galaxies slowly combine into one enormous system helps scientists better understand how the largest structures in the cosmos are assembled. It also reminds us that, despite appearing peaceful when viewed from Earth, the universe is filled with powerful collisions, immense gravitational forces, and breathtaking events happening on scales far beyond human imagination.

This extraordinary merger is not just a scientific curiosity—it is a glimpse into the incredible processes that continue to shape the universe today.

Reference: Z. L. Wen et al, A rare sextuple-merging brightest cluster galaxy system in a disturbed galaxy cluster observed with the Einstein Probe Follow-up X-ray Telescope, arXiv (2026). DOI: 10.48550/arxiv.2606.17700

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