Astronomers have studied the globular cluster 47 Tucanae extensively, but still have many questions. It may have an ...

A distant cluster of galaxies is wrapped in a vast halo of high-energy particles that could be the work of supermassive black holes or a cosmic particle accelerator.

Located about 3.7 billion light-years from Earth in the constellation Carina, the Bullet Cluster is the aftermath of the collision between two galaxy clusters that is estimated to have begun ...

In a groundbreakingrelease on July 7, 2025, NASA showcased extraordinary images from its Hubble and Webb space telescopes ...

Astronomy James Webb Space Telescope Biting the 'Bullet': Amazing new JWST photo shows titanic collision of galaxy clusters ...

The work has been published in Astronomy and Astrophysics. Over one-third of the 'normal' matter in the local universe—the visible stuff making up stars, planets, galaxies, life—is missing.

This is part of what makes galaxy clusters like PLCKG 287.0+32.9 (pronounced “Planck 287” for short) interesting to astronomers — “they carry memories of our early universe, therefore ...

Abell 2255 is a cluster containing between 300 and 500 constituent galaxies, many of which are merging. It's located around 800 million light-years from Earth and spans around 16.3 million light ...

The cloud around it is nearly a whopping 20 million light-years across—about 20 times the diameter of our Milky Way galaxy —beating the previous record holder, seen around cluster Abell 2255 ...

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than ...

Galaxy clusters are some of the largest structures in the universe, containing massive amounts of hot gas, dark matter, and hundreds — even thousands — of galaxies. As an individual galaxy moves ...