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.

Astronomers detect 10 billion-year-old radio waves from a distant galaxy cluster SpARCS1049, revealing a mini-halo that suggests black holes or cosmic collisions energize galaxies.

Using the Very Large Array (VLA), astronomers have performed radio observations of a galaxy cluster Abell 2744, nicknamed Pandora's Cluster. As a result, they obtained the deepest high-resolution ...

A groundbreaking discovery, recently detailed in The Astrophysical Journal Letters, has unveiled a “mini halo” surrounding one of the most distant galaxy clusters observed to date. This mini ...

Galaxy cluster Abell 1489, as imaged by the International Gemini Observatory, contains more than 200 of the gravitationally-bound systems of stars, stellar remnants, interstellar gas and dust.

Astronomers have explained how a galaxy cluster maintains its heat, despite emitting X-rays that cool the hot gas at its center. The group discovered the existence of a fast-moving, high ...

The center of the galaxy cluster Abell 3322, as seen by Hubble. Image: ESA/Hubble & NASA, H. Ebeling The Hubble Space Telescope is no spring chicken, having operated in space for over 30 years.

Correction (August 25, 2023): The story previously stated that the Coma Cluster is a single galaxy, when it is in fact a cluster of almost 1,000 galaxies.

High-speed gas shooting from the galaxy M87 is causing stars to go nova, a study suggests, and no one knows how. A nova occurs after a dense star known as a white dwarf receives gas from an ...