Astronomers Discover Massive Galaxy Cluster in Early Universe

NASA telescopes find a protocluster forming just 1 billion years after the Big Bang.

Jan. 28, 2026 at 9:15pm

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Astronomers have discovered a massive galaxy protocluster, known as JADES-ID1, that formed only about 1 billion years after the Big Bang - much earlier than previously thought possible. The discovery, made using data from NASA's Chandra X-ray Observatory and James Webb Space Telescope, challenges current models of how large-scale structures in the universe evolve.

Why it matters

This finding provides new insights into the early formation of galaxy clusters, which are among the largest structures in the universe. Understanding when and how these structures assemble is crucial for measuring the expansion of the universe and studying the roles of dark matter and dark energy.

The details

JADES-ID1 has a mass of about 20 trillion times the mass of the Sun and contains at least 66 galaxies embedded in a huge cloud of hot gas detected by Chandra. Most models predicted that a protocluster of this size could not have formed so early in the universe's history, just 1 billion years after the Big Bang. The previous record holder for a protocluster with X-ray emission was seen about 3 billion years after the Big Bang.

  • JADES-ID1 was discovered about 1 billion years after the Big Bang.
  • The previous record holder for a protocluster with X-ray emission was seen about 3 billion years after the Big Bang.

The players

Akos Bogdan

Researcher at the Center for Astrophysics | Harvard & Smithsonian (CfA) who led the study published in Nature.

Qiong Li

Researcher at The University of Manchester who led an earlier study that first discovered JADES-ID1 using deep JWST data.

Gerrit Schellenberger

Researcher at the Center for Astrophysics | Harvard & Smithsonian (CfA) and co-author of the study.

Christopher Conselice

Professor at The University of Manchester who co-led the team that found five other protocluster candidates in the JADES field.

NASA's Chandra X-ray Observatory

A space telescope that observed the hot gas in JADES-ID1.

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What they’re saying

“This may be the most distant confirmed protocluster ever seen. JADES-ID1 is giving us new evidence that the universe was in a huge hurry to grow up.”

— Akos Bogdan, Researcher at the Center for Astrophysics | Harvard & Smithsonian (CfA)

“It's very important to actually see when and how galaxy clusters grow. It's like watching an assembly line make a car, rather than just trying to figure out how a car works by looking at the finished product.”

— Gerrit Schellenberger, Researcher at the Center for Astrophysics | Harvard & Smithsonian (CfA)

What’s next

Astronomers plan to conduct further observations of JADES-ID1 to better understand how such a massive structure could have formed so early in the universe's history.

The takeaway

The discovery of JADES-ID1 challenges current models of structure formation in the universe and suggests that the largest cosmic structures may have assembled much more rapidly than previously thought, providing new insights into the early evolution of the universe.