They each orbit around their common center of mass. Because the density of galaxies is high within clusters, galaxy collisions occur. One such collision can be seen in the lower right of the image ...

This scene of cosmic chaos shows a section of the immense Perseus galaxy cluster, revealing several giant elliptical galaxies ...

There’s so much mass in this megacluster that its gravity warps the fabric of spacetime to create a natural super-magnifying ... having formed from multiple galaxy clusters piling into each ...

NASA's James Webb Space Telescope has spotted a young galaxy dating to the early universe - called Firefly Sparkle because ...

It’s almost globular cluster season. One of the mysteries of our galaxy and every other, these dense groupings of up to a million stars—the most massive and oldest star clusters in the ...

An image from the James Webb Space Telescope shows a group of galaxies called the Spiderweb protocluster, and it dates to when the universe was young.

Could a decades-long debate about the mysterious movements of stars in Omega Centauri, the largest star cluster in the Milky Way, finally be resolved? Omega Centauri is a massive star cluster with ...

James Webb Space Telescope imagery of Pandora’s Cluster (Abell 2744) delivers three galaxy clusters and so much more. Take a ...

The eruption is said to have left a giant dent in the Ophiuchus galaxy cluster. Researchers reported their findings in The Astrophysical Journal. "I've tried to put this explosion into human terms ...

The pair of tangled galaxies belong to a larger group known as the Coma galaxy cluster. Many galaxies in this cluster have undergone similar processes of merging with larger companions.