Rich galaxy clusters as a research area focus on the most massive, densely populated bound structures in the universe, typically hosting hundreds to thousands of galaxies embedded in a deep dark matter potential well and permeated by hot intracluster gas. Studies emphasize cluster mass assembly, baryon–dark matter distribution, intracluster medium thermodynamics, and galaxy evolution under extreme environmental effects such as ram-pressure stripping and tidal interactions. Rich clusters are also key cosmological probes, constraining structure formation, dark matter properties, and cosmological parameters through observations of their abundance, scaling relations, gravitational lensing, and X-ray and Sunyaev–Zel’dovich signatures.
An international team of astronomers led by Canadian researchers has found something the universe wasn't supposed to have: a galaxy cluster blazing with hot gas just 1.4 billion years after the Big Bang, far earlier and hotter ...
Astronomy
Jan 5, 2026
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Astronomers have used the Keck Observatory's DEIMOS multi-object spectrograph to observe a nearby galaxy cluster designated RXC J0032.1+1808. As a result, they found that the cluster undergoes a major merging event. The finding ...
Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand individual galaxies and huge reservoirs of superheated, X-ray-emitting gas. The mass of this hot gas ...
Astronomy
Dec 10, 2025
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Galaxy clusters are among the largest structures in our universe, consisting of hundreds or thousands of galaxies that have become gravitationally bound together over billions of years. Astrophysicists have long been eager ...
Astronomy
Aug 5, 2025
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A massive, spacetime-warping cluster of galaxies is the setting of today's NASA/ESA Hubble Space Telescope image. The galaxy cluster in question is Abell 209, located 2.8 billion light-years away in the constellation Cetus ...
Astronomy
Jul 14, 2025
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NASA's James Webb Space Telescope recently zeroed in on the Bullet Cluster—delivering highly detailed images that show a greater abundance of extremely faint and distant galaxies than ever before. Using Webb's crisp near-infrared ...
Astronomy
Jun 30, 2025
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Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster—spanning nearly 20 million light-years. The finding challenges long-standing theories about how particles stay energized ...
Astronomy
Jun 10, 2025
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Using NASA's Chandra X-ray observatory, astronomers have observed a massive and hot galaxy cluster known as PLCKG287.0+32.9 (or PLCKG287 for short). Results of the observational campaign, presented March 17 on the arXiv pre-print ...
The XRISM collaboration has discovered flows of hot gas in the core of the Centaurus Cluster. By comparing state-of-the-art X-ray measurements from the XRISM satellite with numerical simulations, they showed this is evidence ...
Astronomy
Mar 10, 2025
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The core of a massive cluster of galaxies appears to be pumping out far more stars than it should. Now researchers at MIT and elsewhere have discovered a key ingredient within the cluster that explains the core's prolific ...
Astronomy
Feb 13, 2025
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