A stunningly concentrated and hefty galaxy cluster, from a time in the universe's history when such massive structures aren't ...

This NASA Hubble Space Telescope image features a galaxy cluster called CL0016+1609, or MACS J0018.5+1626, that is very ...

X-ray observations of the cluster revealed that it is made up of two galaxy clusters merging along our line of sight.

The James Webb Space Telescope observed 13-billion-year-old light, using a closer galactic cluster like a magnifying glass.

James Webb Space Telescope has delivered stunning views of the "gravitationally distorted realms" of the El Gordo galaxy ...

Galaxy cluster cosmology results from eROSITA’s X-ray all-sky survey deliver the most precise late-universe measurement of matter density and clumpiness ever achieved from galaxy clusters, easing the ...

One of the biggest problems astronomers face when they peer into the night sky is that the heavens above appear two-dimensional. And, indeed, shortly after launch, JWST seemed to make those dreams ...

Dark matter halos are everywhere in the universe, yet no telescope can see them. These vast, invisible structures surround ...

JWST star cluster feedback measurements from Debosmita Pathak at AAS 248 reveal how radiation pressure, stellar winds, and ...

Roughly 2.8 billion light-years from Earth, two galaxy clusters are engaged in a cosmic tussle. These enormous structures last collided about a billion years ago, but now, it appears they’re going ...

Astronomers studying a distant galaxy cluster stumbled upon ancient radio signals that might hold clues to the formation of the early universe. While studying the distant galaxy cluster known as ...

A developing galaxy cluster dating to about 1 billion years after the Big Bang is shown in this handout image released on January 28, 2026. The white box marks the field of view of the Chandra X-ray ...